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  Present Situation and Development Trend of Silage Corn Industry in China WANG Xiaoguang, SHI Guiqing, LIU Chunge, WU Peng, WANG Ronghuan, SHAN Hong, FENG Peiyu, CHENG Guanglei Journal of Agriculture    2023, 13 (7): 20-24.   DOI: 10.11923/j.issn.2095-4050.cjas2021-0118 Abstract + (791)    HTML (25)    PDF (1114KB) (795)       Knowledge map    Silage corn has the reputation of "the king of feed", and generally accounts for about 80% of roughage in the diet formula of dairy cows in developed countries such as the United States. In recent years, the planting area of silage corn has shown a rapid upward trend. In 2016, the planting area of silage corn in China was about 1 million hectares, reaching 1.67 million hectares in 2018, and increasing to more than 2 million hectares in 2020. The number of silage corn approved varieties has also shown explosive growth, with 7 national and provincial silage corn approved varieties in 2016 and a peak of 50 in 2019. From the analysis of planting costs and profits in the national survey, the benefits of planting silage corn are relatively considerable. China has initially formed circular industrial chains such as silage corn seed enterprises, silage production enterprises, and silage consumption enterprises and so on, but there is still a lack of powerful functional departments and industrial organizations to promote the rapid development of the industry. An authoritative evaluation and pricing mechanism for silage corn products beyond the interests of industrial chains has not been established yet. With the continuous improvement of the breeding level of animal husbandry in China, people have gradually enhanced their understanding of the "double-high crops" of the utilization rate and transformation efficiency of whole plant silage corn. On the basis of becoming the main diet of dairy cows, silage corn will further become a high-quality feed for ruminants such as beef cattle and sheep, and the silage corn industry will usher in a new wave of development.

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  The Breeding Mode of ‘Yongyou 988’: A New Maize Hybrid Variety Approved by the Nation LU Hongwei, YANG Meili, SU Yujie, CHENG Jianmei, ZHAO Shuzheng, QIN Guiwen, ZHANG Wencheng Journal of Agriculture    2023, 13 (5): 10-14.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0057 Abstract + (563)    HTML (7)    PDF (957KB) (252)       Knowledge map    ‘Yongyou 988’ is a new maize variety bred by Hebi Academy of Agricultural Sciences with T1932 from European flint line as the female parent and ‘Xun 856’ as the male parent, and it was approved by the nation for Huang-Huai-Hai summer maize region in 2021. In this study, the breeding process, parent source and characteristics, yield performance, stress resistance, disease resistance and quality analysis of the variety were analyzed. The study proposed that in variety breeding, we should highlight the exploration and utilization of excellent germplasm resources, strengthen adversity selection and improve ecological adaptability of the varieties, so as to breed a new maize variety with high yield and quality, wide adaptability, density tolerance and strong stress resistance.

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  Research Status and Trend of Maize Planting Density and Yield LI Jiahang, WANG Shaoxin, XU Luo, LI Zhongjian, WANG Baobao, FENG Jianying Journal of Agriculture    2023, 13 (11): 1-11.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0157 Abstract + (468)    HTML (26)    PDF (3278KB) (1024)       Knowledge map    To have a comprehensive and in-depth understanding of the current situation and development trend of researches on maize planting density and yield at home and abroad, 5150 pieces of literature on maize planting density and yield collected from the CNKI database and Web of Science Core Collection database from 2000 to 2022 were taken as samples for visual analysis based on CiteSpace software. The results showed that the United States ranked first in the total research volume in this field, followed by China, far beyond other countries. In recent years, China had overtaken the United States in the number of research papers in this field, and kept more than 100 articles published every year. Agronomy Journal had the largest number of publications, with a total of 230 papers, and had the largest influence in academic circles. Chinese scholar Liu Peng published the most papers, made the greatest contribution to the research progress in this field, and cooperated closely with other authors. The research institutions were mainly universities, mostly in northern China, and the cooperation among regional institutions needed to be strengthened. In this field, special corn such as fresh food and silage corn, water and nitrogen utilization efficiency, sustainable agriculture, mechanized management, soil properties, yield loss, mathematical model, straw utilization, and so on are the hot research issues in recent years.

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  Research Progress and Prospects of Circadian Clock in Lepidoptera QUAN Linfa, YAO Qiong, DONG Yizhi, XU Shu, CHI Yanyan, CHEN Bingxu Journal of Agriculture    2023, 13 (9): 38-45.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0097 Abstract + (384)    HTML (12)    PDF (1940KB) (674)       Knowledge map    A long period of evolution causes obviously diurnal and seasonal rhythmic changes in insect life and behavior-circadian clock. At present, Lepidoptera is the most species-rich group of insects, including about 160000 identified species of butterflies and moths, and nearly 70% of the important major agricultural and forestry pests belong to Lepidoptera. The research progress of the circadian clock in Lepidoptera is of great significance for in-depth analysis of variable physiological and behavioral regulation mechanisms of Lepidoptera, effective development of the production of economic insects, and the control of agricultural and forestry pests. In this paper, the effects of the circadian clock on hatching, eating, growth, metamorphosis, reproduction and diapause, courtship behavior and migration in Lepidoptera were summarized. And the critical research advances of molecular regulation of circadian clock and coordinated regulation of circadian clock and endocrine hormones in Lepidoptera were particularly described. Based on the circadian clock principle, we discussed the co-evolutionary relationship between Lepidoptera and plants and its important ecological implications, and the application prospect of circadian clock theory in agricultural pest control and economic insect rearing improvement.

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  Carotenoids’ Contents in Different Wheat Varieties: Comparative Analysis SUN Xin, CUI Zhengyong, LI Xinhua, YANG Zaidong, LIU Ying, SUN Mingzhu, ZHANG Tianyu, LI Peng, SONG Huadong Journal of Agriculture    2023, 13 (6): 1-4.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0040 Abstract + (375)    HTML (13)    PDF (1342KB) (442)       Knowledge map    Carotenoids are important factors affecting the color and nutritional quality of wheat flour and flour products. They have functions such as antioxidant, cancerprevention, and night blindness prevention. In order to study the contents of carotenoids among different wheat varieties, ‘19Q1121’, ‘Luyuan 502’, ‘Jimai 22’, ‘Luyan 128’, ‘Luyuan 309’ were used to determine the composition and content of carotenoids by Ultra Performance Liquid Chromatography (UPLC) and Tandem Mass Spectrometry (MS/MS). The results show that the main components of carotenoids are lutein, zeaxanthins, canthaxanthin, lutein palmitate, lutein dipalmitate, lutein oleic acid ester, etc. Among them, the content of lutein in ‘Luyuan 309’is 7.45 μg/g, which is significantly higher than that of other varieties. In this experiment, the method for cultivating new wheat varieties with high carotenoid content was obtained, which could lay a foundation for improving the nutritional quality of wheat.

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  Allelopathic Effects of Water Extracts from Millet on Seed Germination and Seedling Growth of Giant Foxtail ZHAO Na, LI Guoyu, LI Guoqing, CONG Xinjun Journal of Agriculture    2024, 14 (4): 1-6.   DOI: 10.11923/j.issn.2095-4050.cjas2023-0078 Abstract + (333)    HTML (9)    PDF (1290KB) (139)       Knowledge map    In order to explore the allelopathy between millet and giant foxtail growth, the effects of different concentrations of water extracts on foxtail millet seed germination and seedling growth were studied by using‘Jinxuan 6’and ‘Setaria viridis’ as experimental materials. The results showed that different concentrations of water extracts have‘low promotion and high inhibition’on seed germination and seedling growth. Compared with the control, the emergence rate was decreased by 13.888%, and the allelopathic index was -0.139 under the treatment of original solution. The comprehensive indexes of root length, bud length, fresh weight and dry weight were -0.070 and -0.034 under the treatment of original solution and 10 times diluted solution, which showed allelopathic inhibition, meanwhile the total length, leaf area, chlorophyll content and SOD of plant were lower than those of the control. The emergence rate was increased by 33.333% and 11.117% under the treatment of 50 and 100 times diluted solution, and the comprehensive indexes of root length, bud length, fresh weight and dry weight were 0.275 and 0.153, which showed allelopathic promotion. Among them, the 50 times diluted solution had the strongest promotion, the total length, leaf area, chlorophyll content and SOD of plant were significantly different from the control. The millet field is often accompanied by a large number of giant foxtail, the results will provide a theoretical basis for removing the giant foxtail at the seedling stage.

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  Preliminary Screening of Soybean Varieties Suitable for Intercropping with Corn in Zibo LIU Weixia, LU Duxu, LU Zhenyu, ZHANG Chao, ZHAI Jiqing, ZHAI Naijia, WANG Guangming Journal of Agriculture    2024, 14 (4): 7-13.   DOI: 10.11923/j.issn.2095-4050.cjas2023-0073 Abstract + (323)    HTML (11)    PDF (1344KB) (157)       Knowledge map    The aim is to promote the healthy and stable development of the corn industry, adjust and optimize the corn planting structure, enrich diversified planting patterns in Zibo City, and achieve the purpose of green, high-quality and efficient production. This study analyzed the comprehensive performance of intercropping between the same corn variety and different soybean varieties, and selected suitable soybean varieties for local intercropping cultivation preliminarily. The results showed that under the same meteorological environment, the incidence of northern leaf blight and smut of maize in intercropping mode was mild, and there was little difference in other characters. The growth period of early maturing and shade tolerant soybean varieties such as ‘Hedou 23’, ‘Hedou 12’, and ‘Qihuang 34’ was 1-3 days shorter than other varieties. They had strong resistance to Riptortuspedestris, moderate and stable main stem height, node number, and bottom pod height. The grain weight per plant was 0.53-1.72 g higher than other varieties, and the yield was 88.81-214.59 kg/hm2 higher than other varieties. Overall, varieties such as ‘Hedou 23’, ‘Hedou 12’, and ‘Qihuang 34’ were suitable for intercropping of corn and soybean in Zibo region.

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  The Effects of Staged Sowing on Yield and Quality of Summer Maize CUI Zhaoyun, ZOU Junli, YANG Rongguang, SHI Zhaopeng Journal of Agriculture    2023, 13 (5): 1-9.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0046 Abstract + (320)    HTML (17)    PDF (1213KB) (431)       Knowledge map    The objective of the study is to explore the effects of different sowing dates on dry matter accumulation, yield and quality of summer maize under the background of climate change. ‘Denghai 605’ was used as the test material, four sowing dates were set: May 31 (sowing date 1, S1), June 10 (sowing date 2, S2), June 20 (sowing date 3, S3) and June 30 (sowing date 4, S4), to study the effects of different sowing dates on plant height, leaf area index, dry matter accumulation and distribution, grain filling characteristics, yield and quality formation of summer maize under different climate backgrounds in different years. The yield of summer maize varied from year to year at different sowing dates. The yield was higher under S3 in 2018. S1 had the highest yield in 2019, which was higher than that of other years. S2 had the highest yield in 2020, which was significantly higher than that of other sowing dates. Maize population yield was significantly correlated with accumulated temperature, ear diameter was significantly correlated with precipitation, and extremely significantly correlated with sunlight; ear length was significantly correlated with sunlight. Different sowing dates had an impact on the content of grain protein, fat and starch, and had a greater impact on crude fiber content. Accumulated temperature was significantly correlated with grain fat content and crude fiber content, and sunlight was significantly correlated with grain starch content. The effect of sowing date on plant height was relatively small and the effect on leaf area index was large. Sowing at the right time could effectively increase the leaf area index and biomass of maize. Leaf area index was significantly higher under S2 and S3 in 2018, especially the leaf area index under S3 were higher than that of other sowing dates in this year, the ear dry matter accumulation was high at the harvest stage, and the yield was higher than that at other sowing dates. Sowing at the right time can make full use of local climatic conditions, improve the utilization of sunlight, temperature and water resources by summer maize, promote the transfer of photosynthetic assimilates from the leaves to the ears, and increase the rate of grain filling, thus effectively increasing grain weight and ensuring the formation of yield and quality.

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  The New Wheat Variety ‘Jirumai 25’ with Drought Resistance, Water Saving, High and Stable Yield: Breeding and Characteristic Analysis WANG Fuyu, CHEN Guiju, GAO Qiurong, SHAO Minmin, HUANG Ling, ZHAO Kai, YANG Benzhou, ZHANG Yudan, SUN Leiming, ZHAI Hongmei, WANG Lin Journal of Agriculture    2024, 14 (7): 6-11.   DOI: 10.11923/j.issn.2095-4050.cjas2024-0018 Abstract + (303)    HTML (6)    PDF (1673KB) (95)       Knowledge map    In order to cultivate new wheat varieties with stable yield in dry years and high yield in wet years, a new wheat variety 'Jirumai 25' was bred by Jining Academy of Agricultural Sciences. This variety was developed through sexual hybridization using the high-yield and drought resistant variety 'Shannong 2149' as the female parent and the high-yield variety 'Liangxing 619' as the male parent. 'Jirumai 25' is the winter type with a plant height of 77.5 cm, good lodging resistance and ripening, full grain, good commodity, drought resistance, water saving, high and stable yield, and good integrated resistance. The results of the two-year regional experiments showed that the average yield was 7742.55 kg/hm2, which was 4.02% higher than that of the control variety. In the production experiment of Shandong wheat dryland in 2022-2023, the average yield was 7176.15 kg/hm2, which increased by 5.6% compared with 'Shannong 27', and the yield increase rate was 100%. It was approved by the Shandong Crop Variety Approval Committee in December 2023, with the approval number of Lu Sheng Mai 20230029. The approval of 'Jirumai 25' wheat new variety provides strong breed support for dryland wheat production in southwestern Shandong and has a broad application prospects.

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  Research Progress of Breeding Model, Method and Regionalization of Konjac Seed Taro CAI Yangguang, DUAN Longfei, QIN Jianfeng, GUO Bangli, CHEN Guo’ai, ZHANG Bairen Journal of Agriculture    2023, 13 (10): 1-7.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0147 Abstract + (290)    HTML (12)    PDF (1327KB) (406)       Knowledge map    This paper summarizes the main breeding models, methods and regionalization of konjac seed taro in China, including breeding models of field, understory, facility and courtyard breeding, breeding methods of using rhizomes or corms, cuttings, plant tissue culture and seed breeding, and 4 main regions and 6 sub-regions of Konjac seed breeding. Based on the review, the paper proposes suggestions including reasonable layout of konjac varieties under different climate conditions, innovative development of economic forest, fruit forest and breeding facilities suitable for interplanting konjac; integrates mountain konjac cultivation techniques to prevent drought and waterlogging, biological diversity and multi-dimensional interplanting technology for weed prevention and control, and konjac - soybean - corn strip interplanting technology. The above results improve and innovate the breeding mode and method of konjac seed taro, and expand the suitable planting area of konjac, in order to promote the development of konjac industry in the mountainous area of southwest China.

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  Stress Resistance of Cotton: Establishing the Identification Technical Standard System ZHENG Shufeng, WANG Yanqin, XU Daoqing, PENG Jun, KAN Huachun, LIU Xiaoling, WANG Wei, CHEN Min, LI Shuying Journal of Agriculture    2023, 13 (6): 5-10.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0087 Abstract + (280)    HTML (10)    PDF (1278KB) (278)       Knowledge map    Cotton is a major cash crop in China, which is widely distributed, has a long production cycle and is greatly affected by abiotic stresses. Breeding and screening cotton varieties with strong stress resistance are the main ways to reduce stress disasters, and the study on abiotic stress resistance identification techniques and standards of cotton varieties is crucial. For this purpose, this paper summarized basic methods of crop stress resistance identification at home and abroad in recent years, as well as the identification contents, identification periods, identification methods, identification indicators and stress determination levels of five common and frequent abiotic stresses (ecological stresses) of cotton, such as drought, waterlogging, salinization, high temperature and heat injury, and cold and chilly injury. The paper also summed up basic principles, framework and content for formulating stress identification standards and establishing the standard system. The basic ideas for further research are proposed, mainly including fast, convenient and non-destructive stress resistance identification based on new technologies such as Spectrum/Hyperspectrum, stress resistance identification under complex stresses, and direct location of relevant stress resistance genes by molecular biology for identifying stress resistance.

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  Research on Rural Human Settlements at Home and Abroad Based on CiteSpace: A Review LI Jiaying, WANG Yanwei, ZHENG Shanfeng, LI Xin, HUANG Yi Journal of Agriculture    2024, 14 (2): 83-93.   DOI: 10.11923/j.issn.2095-4050.cjas2023-0045 Abstract + (277)    HTML (9)    PDF (3017KB) (369)       Knowledge map    In order to understand current status and hot issues of rural habitat environment at home and abroad, using CiteSpace literature analysis software, an analysis of those research literatures about rural habitat environment selected from 2002 to 2022 China Knowledge Network (CNKI) and Web of Science core collection database was carried out, and a knowledge map of rural habitat environment research at home and abroad was drawn. The results show that: (1) the number of publications abroad is more than that in China, and the research theories are richer; the cooperation network of research between authors abroad is closer than that in China, indicating more interdisciplinary exchanges; the main publishing institutions at home and abroad are concentrated in universities; the US and China are the main publishing countries. (2) The domestic researches mainly focus on the hard and soft environment of rural areas, including those topics around "rural revitalization", "new rural areas", "rural governance" and "rural development". While the researches abroad focus on the impact of rural habitat on villagers, the topics are mainly around "climate change", "mental health", "physical activity" and "infectious diseases". In the future, the combination of theory and practice in rural habitat research should be further strengthened, and both qualitative and quantitative research methods should be emphasized. Moreover, the depth and breadth of rural habitat research will be expanded based on a multidisciplinary perspective.

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  Effects of Maize and Soybean Intercropping on Agronomic, Quality and Yield Traits of Soybean ZHAO Xiaoguang, ZHAO Xingzhong, LIU Haomeng, XIAO Jinping, ZHANG Pu, ZHANG Yalei, WANG Liping Journal of Agriculture    2023, 13 (8): 18-24.   DOI: 10.11923/j.issn.2095-4050.cjas2023-0022 Abstract + (264)    HTML (11)    PDF (1189KB) (275)       Knowledge map    In order to expound the changing rules of agronomic traits, quality traits and yield traits of soybean varieties under maize and soybean intercropping mode, 7 soybean varieties and maize variety 'Shandan 650' were selected for intercropping, and the differences of various traits of soybean varieties under the intercropping and the monocropping modes were analyzed. The results showed that the plant height, pod height and nodes on main stem of intercropping soybeans were higher than that of monocropping soybeans, but the pod number per plant and pod density of intercropping soybeans were lower than that of monocropping soybeans, and the growth period of intercropping soybeans were longer than that of monocropping soybeans; the crude fat and protein of intercropping soybeans were higher than that of monocropping soybeans, the content of saturated fatty acid of intercropping soybeans were lower than that of monocropping soybeans, but the content of linoleic acid and linolenic acid of intercropping soybeans were higher than that of monocropping soybeans; the grain weight per plant, number of grains per plant and number of grains per pod of intercropping soybeans were lower than that of monocropping soybeans. The changing rules of 100-grain weight were not consistent among different varieties. The average yield of 7 soybean varieties under intercropping mode was 49.88% lower than that under monocropping mode. Through the analysis of various traits, it provided strong support for us to select suitable soybean varieties in different regions for maize and soybean compound planting.

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  Residue Behavior and Dietary Risk Assessment of Prochloraz and Its Metabolites in Celery and Ginger LIU Qian, SHEN Jing, LIU Jun, CHEN Xin, CHENG Yunbin Journal of Agriculture    2023, 13 (5): 44-49.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0069 Abstract + (252)    HTML (3)    PDF (1142KB) (572)       Knowledge map    In order to study the residue behavior and dietary intake risk of prochloraz and its metabolites in celery and ginger, the 1-year and 6-site standardized residue test of prochloraz and its metabolites in celery and ginger was carried out, samples were analyzed by gas chromatography (GC-ECD), and the dietary intake risk of prochloraz and its metabolites in celery and ginger were evaluated by using the methods of Joint Meeting on Pesticide Residues. When the adding levels of prochloraz were 0.02, 0.1 and 1 mg/kg, the average recovery rate of prochloraz in ginger was 77%-87%, and its relative standard deviation was 3%-13%.When the adding levels of prochloraz were 0.05, 0.5, 1 and 10 mg/kg, the average recovery rate of prochloraz in celery was 75%-114%, and its relative standard deviation was 3%-6%. The half-life of prochloraz in celery was from 6.1-6.8 d. The national estimated daily intake (NEDI) of prochloraz for the general population was 0.67331 mg/d, and the risk probability of dietary intake was 106.9%. The results show that the dietary intake risk of prochloraz and its metabolites is not acceptable for the general population of China. This experiment provides a basis for the rational application and scientific supervision of prochloraz in vegetables, and the establishment of Maximum Residue Limit (MRL) standards of prochloraz and its metabolites in celery and ginger.

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  Study on Forecasting Model of Strawberry Yield in Greenhouses in the South of the Yangtze River LI Qingbin, ZHONG Pengzhi, WEI Shasha, HUANG Xin, CHEN Lei, SUN Junbo, CAO Yanyan Journal of Agriculture    2023, 13 (5): 66-70.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0026 Abstract + (249)    HTML (8)    PDF (1114KB) (245)       Knowledge map    The study aims to establish a strawberry yield forecasting model for unheated greenhouses in climate-similar regions in the south of the Yangtze River, represented by Cixi of Zhejiang Province. According to the main growth periods and the physiological characteristics of fruit growth of greenhouse strawberry in winter and spring, we used statistical data of strawberry yield in greenhouses in Zhejiang Province Facility Agricultural Meteorological Experiment Station (Cixi) from 2011 to 2021 and the microclimatic data of various microclimate elements in greenhouses during the period of yield formation for the study. Then, we adopted the polynomial forecasting method to establish a multiple regression model based on key microclimatic factors such as effective accumulated temperature and radiative heat accumulation and the strawberry yield, and built a yield forecasting model of greenhouse strawberry for the south of the Yangtze River. The average accuracy of the yield forecasting model was 95.3%, and the minimum accuracy was above 90%. The model had good accuracy and could provide more accurate forecasting information for the annual yield of greenhouse strawberry. This study can be a basis for the yield forecast of greenhouse strawberry in the south of the Yangtze River and the production of greenhouse fruits and vegetables in other climate-similar regions.

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  Prediction Model of Minimum Temperature Inside Solar Greenhouse in Central Hexi Corridor Based on Ridge Regression BAI Qinghua, YIN Xuelian, WANG Jing, ZHANG Jie, CHU Chao, LI Xuejun Journal of Agriculture    2023, 13 (5): 96-100.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0052 Abstract + (247)    HTML (9)    PDF (1175KB) (294)       Knowledge map    The minimum temperature prediction model inside solar greenhouse in Ganzhou of Gansu Province was established based on meteorological elements by using ridge regression analysis. The multicollinearity of predictors was diagnosed through statistic test on the basis of reasonable selecting predictors, the ridge regression analysis was used to get over the influence of multicollinearity on the model stability, and the accuracy of the prediction model was tested by comparing simulated values and measured values. The results showed that collinearity existed among the predictors, and the prediction model of the minimum temperature inside solar greenhouse based on ridge regression could overcome the influence of collinearity on the model parameters. Between the simulated values and measured values, the accuracy rate of the absolute error (≤3℃) was 98.4%, the coefficient of determination (R2) was 0.8543, the root mean square error (RMSE) was 0.7849℃, and the accuracy of the prediction model was high. The minimum temperature prediction model based on ridge regression could reasonably and effectively predict the minimum temperature inside the local solar greenhouse.

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  Knowledge Graph Construction and Visualization in Soil Fertility and Scientific Crop Fertilizer Management ZHANG Caili, WU Saisai, LI Wei, WANG Hui, CHEN Lei Journal of Agriculture    2023, 13 (7): 80-86.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0067 Abstract + (245)    HTML (11)    PDF (1741KB) (300)       Knowledge map    Aiming to improve the function of artificial intelligence in agriculture, and to search the knowledge organization and application in field of soil fertility, the soil fertility ontology of Anhui Province was built with manual construction method as well as the Protégé application software. Then the structured data, semi-structured data and unstructured data related to soil fertility in Anhui Province were first cleaned and then processed by inverse distance weighted (IDW) interpolation. Based on deep learning model of ERNIE-BiLSTM-CRF and PCNN-Attention, the tasks of named entity recognition and relationship extraction were realized, and all the triplet data were stored in Neo4j graph database. And the visual knowledge graph of soil fertility was successfully constructed. This study can provide reference for the construction of other agricultural knowledge graph in the aspects of ontology construction, entity relationship extraction model and graph visualization.

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  Effects of Food Waste Soil Conditioners on Soil Physicochemical Properties and Rice Yield LI Dan, WANG Jingwen, YUAN Hangjie, SHANG Xiaolan, HUANG Yue, WEI Jiqian Journal of Agriculture    2023, 13 (6): 39-42.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0080 Abstract + (244)    HTML (7)    PDF (1138KB) (217)       Knowledge map    By studying the comprehensive application effects of food waste soil conditioners on soil quality and crop growth, we aim to provide technical support for high and stable yield of rice. Different application rates on improving soil physicochemical properties and rice yield were discussed by plot field experiments. The results showed that food waste soil conditioners could effectively improve soil pH, and significantly increase the contents of soil organic matter, total nitrogen and available phosphorus. However, the soil total water-soluble salt content showed an upward trend with the increase of the conditioner application rate, so there was a risk of salinity accumulation. In addition, due to the high nitrogen content of the conditioner, high application rate could cause rice over-green and lodging, resulting in yield reduction. Comprehensive analysis of soil improvement, salinity accumulation and rice yield, T3 (conditioner rate of 15000 kg/hm2 + fertilizer) and T4 (conditioner rate of 30000 kg/hm2 + fertilizer) had better effects.

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  Effects of Climate Warming on Phenological Phase of Albizia julibrissin in Linfen REN Yuhuan, YAO Chuang, ZHAO Haiyan, FAN Zhixuan, LIU Jiqin, LI Jingjing Journal of Agriculture    2023, 13 (5): 89-95.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0047 Abstract + (243)    HTML (5)    PDF (1287KB) (252)       Knowledge map    To reveal the influence of climate warming on the phenological phase of typical urban woody plants in loess plateau, the effects of climate factors such as temperature and accumulated temperature on phenological phase of Albizia julibrissin in Linfen were analyzed by linear regression, wavelet analysis and correlation analysis. The results showed that the annual average temperature in Linfen showed an increasing trend under the background of global warming, with an increase of 2.9℃ from 1983 to 2021. The annual average precipitation fluctuated with the interval of 6 years and 15 years, respectively. Spring phenological phase was earlier and autumn phenological phase had no obvious changing trend, resulting in increased growth season. The temperature and accumulated temperature were very significantly correlated with first leaf unfolding and first flowering, and were significantly correlated with fruit maturing. The first leaf coloration and the end of leaf fall were not sensitive to meteorological conditions, and were affected by the date of fruit ripening.

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  Effect of Key Water in Drip Irrigation Under Plastic Film on Quality and Yield of Winter Potato YIN Yamin, KONG Weibo, FAN Chunmei, PENG Errui Journal of Agriculture    2023, 13 (6): 11-16.   DOI: 10.11923/j.issn.2095-4050.cjas2022-0072 Abstract + (242)    HTML (6)    PDF (1281KB) (209)       Knowledge map    The growth period of winter potato in Yunnan is in dry season, and the crop water demand is difficult to be fully guaranteed. Crop water demand can be supplemented by irrigation, but the impact of irrigation time and irrigation volume on crop growth and development is not clear. By using drip irrigation under film, different irrigation treatments were carried out at full seedling stage, flowering stage and starch accumulation stage of winter potato to find the optimum irrigation time and volume. The results showed that when the irrigation was carried out twice at full seedling stage and flowering stage and the irrigation amount was 72 m3/hm2 each time, the winter potato yield was the highest (58790 kg/hm2), the commercial potato rate was the best (95.6%), and the economic benefit was the optimal (84059.71 kg/hm2). The experiment verified that the critical irrigation period of winter potato in Yunnan is full seedling stage and flowering stage, and the irrigation amount of 72 m3/hm2 each time is the best irrigation amount of key water for winter potato cultivation.