Current issue

• 2021 Vol.11 No.12 Published:20 December 2021

  Correlation Between Agronomic Traits and Yield Indexes of Huainan Wheat Variety in Jiangsu Province YI Zhengwei, LIN Peipei, YUAN Hong, ZHU Haipeng, WU Jiyu, WANG Xian, HUA Rong 2021, 11 (12):  17-23.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0267 Abstract + ( 363 )   HTML ( 13 )   PDF ( 1236KB )   ( 316 ) To select suitable wheat varieties with high yield, strong adaptability and good stability for the cultivation environment in Taizhou area, 20 wheat varieties which were approved by National Crop Variety Certification or by Jiangsu Province and planted in Jiangsu in recent years were taken for field comparison test on correlation analysis of agronomic traits and yield traits of wheat varieties. The results show that the agronomic characters and actual yield of wheat varieties with different genotypes are significantly different, and the yield varies between 5150-7350 kg/hm2, with an average yield of 6095 kg/hm2. The actual yield of ‘Huamai 8’, ‘Ningmai 22’ and ‘Yangmai 27’ have obvious advantages, among which, the actual yield of ‘Huamai 8’ is more than 1200 kg/hm 2 compared with that of other varieties, and the bulk density of ‘Huamai 8’ and ‘Yangmai 27’ are more than 800 g/L. According to the comprehensive performance in field, ‘Huamai 8’, ‘Ningmai 22’ and ‘Yangmai 27’ have better yield, medium lodging resistance and disease resistance, reasonable growth period and outstanding economic characters, and could be widely planted in Taizhou area.

  Drought-resistant and Water-saving Wheat Variety ‘Jimai 262’: Breeding Experience LI Haosheng, CHENG Dungong, LIU Cheng, HAN Ran, SONG Jianmin, LIU Aifeng, CAO Xinyou, GUO Jun, WANG Canguo, LIU Jianjun, ZHAO Zhendong, ZHAI Shengnan, ZI Yan, LI Faji 2021, 11 (12):  24-27.  DOI: 10.11923/j.issn.2095-4050.cjas20191000242 Abstract + ( 710 )   HTML ( 14 )   PDF ( 1233KB )   ( 233 ) To cultivate a breakthrough wheat variety with high and stable yield, drought tolerance, water saving and multi-resistance, taking high-yield variety ‘Linmai 2’ as female parent and high-yield, drought-tolerance ‘Yannong 19’ as male parent, we used pedigree method to polymerize both parents’ excellent agronomic characters, and bred a new wheat variety ‘Jimai 262’ by multi-site and multi-ecological field experiments. This variety was characterized as high yield, good quality, good resistance to disease and tolerance to stress, excellent agronomic characters and could be cultivated in both irrigated land and dry land. In irrigated field variety comparison trial 2010-2011 in Jinan and Mengyin, the average yield of ‘Jimai262’ was 2.87% and 9.41% higher than that of control variety ‘Jimai 22’, and ranked first in both sites. In the dry land regional trail 2012-2013 of Shandong Province, the average yield of ‘Jimai262’ was 9.74% higher than that of control variety ‘Lumai21’, achieved the highest yield increase of dry land variety in the past decade. The grain of ‘Jimai 262’ was big and full, the quality traits such as grain protein content, wet gluten content and flour whiteness were better than that of control variety ‘Lumai21’. ‘Jmai262’ was resistant to hot dry wind, moderate resistant to stripe rust, and the plant height was 67.2 cm. At the later stage, the leaf photosynthetic function period was long, the population was yellowing well, the spike was oblong, the grain number per spike was 37.5, the thousand-grain weight was 44.7 g, and the grain was white and silt. ‘Jimai 262’ was released by Shandong Province in February 2016, it is suitable for planting in arid fertile land and water deficient area without irrigation condition.

  The Combining Ability of Different Maize Hybrid Combinations and the Influencing Factors on Mechanical Grain Harvest Quality WEI Feng, YANG Haifeng, WANG Jiamu, MA Yi, MA Junfeng, HONG Defeng, WEI Xiaoyi 2021, 11 (12):  28-33.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0146 Abstract + ( 318 )   HTML ( 9 )   PDF ( 1272KB )   ( 198 ) Mechanical grain harvest of maize is the development direction of China’ maize industry. The purpose of the study is to explore the combining ability of different maize inbred lines and the influence on the mechanical grain harvest quality of the hybrid combinations. Seven American inbred lines were used as female parent, five ‘Xin 01A3’ improved lines were used as male parent, incomplete diallel cross was adopted, and 35 maize hybrid combinations were used as materials. After mechanical grain harvest, the yield and grain moisture content were measured, and the impurity rate, broken rate, and the shatter loss rate were calculated. The combining ability of yield was analyzed. The results showed that the general combining ability of ‘XL2’ was the highest. Among the five male inbred lines, the general combining ability of ‘Xin A389’ was the highest, and that of ‘Xin 69’ was the second. The special combining ability of ‘XL6× Xin 69’ was the highest, and that of ‘XL7× Xin 3764’ was the second. The correlation of each character was analyzed, and the results showed that there was a significantly positive correlation between the broken rate and the moisture content. Among the 35 hybrid combinations, compared with the adjacent control, the yield of 32 maize hybrid combinations increased by more than 5%, and the grain moisture content of all hybrid combinations was lower than 28.0%, suggesting that these hybrid combinations were suitable for mechanical grain harvest. In the future, the utilization of high combining inbred lines ‘XL2’, ‘XL5’, ‘Xin A389’ and ‘Xin 69’ should be enhanced.

  A Preliminary Study on Introduction Experiment of Quinoa in Ningxia XU Rui, MA Liwen, LI Jianping 2021, 11 (12):  34-39.  DOI: 10.11923/j.issn.2095-4050.cjas20191100273 Abstract + ( 326 )   HTML ( 11 )   PDF ( 1405KB )   ( 274 ) To screen out suitable quinoa varieties and planting regions for Ningxia, we carried out the test planting of different quinoa varieties in five locations, including Haiyuan, Yanchi, Pengyang, Tongxin and Xiji, according to local environmental characteristics from 2017 to 2018. The results showed that the trials in Pengyang, Tongxin and Xiji failed for 2 consecutive years, Yanchi had a low yield in 2017 of 3.69 kg/hm2, no yield in 2018. None of these four locations was suitable for quinoa cultivation. Haiyuan test point successfully cultivated different quinoa varieties for 2 consecutive years, and the varieties showed the best adaptability and high yield. The field performance of the varieties was basically the same, among them, ‘Tiaoli No.1’ and ‘Longli No.1’ had the best yield and adaptability, and could be planted in Haiyuan for demonstration. The results of the experiment could provide references for avoiding risks in quinoa promotion in Ningxia, and establish a foundation for further use of meteorological factors for quinoa planting zoning.

  Breeding of ‘Hengmian 1670’: A Cotton Variety with Salt and Drought Tolerance, Good Quality and High Yield DAI Maohua, LIU Liying, LIU Xuemei, LI Chenhui, WU Zhenliang 2021, 11 (12):  40-43.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0044 Abstract + ( 348 )   HTML ( 9 )   PDF ( 1163KB )   ( 372 ) Cultivation and application of new cotton varieties with high quality and high yield is the key to water-saving and improving quality and efficiency in cotton production. Dryland Farming Institute of Hebei Academy of Agricultural and Forestry Sciences took ‘Hengmian 210’ (resource material of middle-early maturity and disease-resistant upland cotton) as female parent and ‘Hengmian 4’ as male parent to carry out hybrid combinations. After years of continuous directional selection, ‘Hengmian 1670’ was selected under disease stress, pest stress, salt stress and drought stress. ‘Hengmian 1670’, approved by Hebei Province in August 2019 (Jishenmian 20190013), has outstanding performance such as the resistance to Fusarium and Verticillium wilts, high yield and quality, salt tolerance, drought resistance and water-saving, and it is suitable for planting in Hebei Province and similar ecological spring sowing cotton areas in the Yellow River Basin.

  Identification and Evaluation of Peanut Germplasm Resistance to Bacterial Wilt YANG Guang, LI Hangyu, CHEN Long, SHI Shoushe, YU Minghui 2021, 11 (12):  44-47.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0181 Abstract + ( 326 )   HTML ( 13 )   PDF ( 1233KB )   ( 286 ) To select peanut cultivars which are resistant to bacterial wilt and suitable to grow in Xinyang of Henan Province, 27 peanut cultivars were planted with bacterial wilt root soaking in field, and the incidence rate and disease index were calculated. Then we carried out disease resistance identification and screening. The results indicate that there are 10 cultivars with high and medium resistance to bacterial wilt, accounting for 37% of the total, among the 3 cultivar types, 2 are resistant to the disease. The occurrence regularity of 6 resistant cultivars shows that the disease index increases rapidly on the 7th and 14th day, and there is no change after 21 days. The high oil type ‘Yuanza 9102’ and ‘Xinhua 425’, high oleic type ‘Xinhua 14’ and ‘Zhuhua 11’, and ordinary type ‘Yuanza 21’ and ‘Yuhua 149’ are disease-resistant cultivars suitable for cultivation in Xinyang.

  Effects of Clay Mineral Amendments on Soil Organic Carbon Accumulation in Newly Reclaimed Sandy Loam Farmland LV Xiaohan, ZHANG Mingkui, YAN Jianli 2021, 11 (12):  48-52.  DOI: 10.11923/j.issn.2095-4050.cjas20190700137 Abstract + ( 310 )   HTML ( 6 )   PDF ( 1187KB )   ( 303 ) To understand the role of clay mineral amendments in improving the soil fertility of newly reclaimed farmland, four clay minerals, bentonite, kaolinite, zeolite and diatomite, were selected for testing their effects on mineralization of organic fertilizers and accumulation of soil organic carbon by incubation experiments with 10% addition of the amendments. The results showed that the addition of clay minerals could significantly increase the accumulation of soil organic carbon as compared with the control, and the effect decreased in the order of bentonite> kaolinite> diatomite> zeolite. Aggregate measurement and heavy liquid fractionation showed that the addition of clay minerals could significantly increase the amount of water-stable aggregates in the soils and promote the formation of mineral-bound organic carbon. In general, clay minerals could increase the stability of organic carbon, which is the main reason for increasing organic carbon accumulation in the soils.

  Soil Clayization and Argic Horizon Identification in Mountain and Hilly Areas of Southern China ZHANG Mingkui 2021, 11 (12):  53-57.  DOI: 10.11923/j.issn.2095-4050.cjas20191100257 Abstract + ( 287 )   HTML ( 9 )   PDF ( 1072KB )   ( 315 ) Soil clayization discussed in the domestic and foreign literatures can be divided into three types: argillification, residual clayization and secondary clayification, but the formation of argic horizon, as a diagnostic horizon identified by luvisols, only involves argillification and secondary clayization. In mountainous and hilly areas of southern China, because of obvious soil desilication and aluminization, high soil Al3+ saturation, and high proportion of 1:1 type in clay minerals, it is difficult to have argillification in most cases. Secondary clayization generally occurs in the temperate regions with climatic conditions of semi-dry. Therefore, except for some soils derived from calcareous parent materials, there is no soil-forming environment of luvisols in mountainous and hilly areas of southern China. However, the difference of soil texture between surface and lower horizons in those areas is often the result of surface erosion in a long historical period. It is inconsistent with the principle of soil genesis and classification to classify those soils as luvisols. In order to avoid exaggerating distribution of luvisols in hilly and mountainous soils in southern China, and solve the uncertainties in the identification of both luvisols and cambosols, it is suggested that the definition of argic horizon in Keys to Chinese Soil Toxonomy should refer to the definition of argic horizon in USA Soil Taxonomy for taking base saturation (i.e. base saturation greater than 50%) as an index to identify argic horizon.

  Organosilicon Soil Conditioner: Effect on Soda-type Saline-alkali Soil Improvement and Rice Yield SONG Furu, SONG Liqiang, CAO Ziku, SONG Zhiqiang, NIE Hongmin, SHI Yunfeng 2021, 11 (12):  58-63.  DOI: 10.11923/j.issn.2095-4050.cjas2021-0115 Abstract + ( 470 )   HTML ( 10 )   PDF ( 1322KB )   ( 563 ) It is known that organosilicon soil conditioner can improve saline-alkali soil and promote crop growth. The effect and mechanism of organosilicon soil conditioner on physical and chemical properties of soda-type saline-alkali soil and biological properties of rice were investigated by the study. From 2018 to 2020, a large-scale comparative experiment and demonstration study was carried out on rice in typical soda-type saline-alkali soil in Sikeshu Township and Longzhao Town of Da’an City. Compared with the local subsoil samples, the application of organosilicate soil conditioner could reduce the bulk density of cultivated soil layer by 8.28%-16.55%, water soluble salt by 13.57%-53.82%, exchangeable sodium by 16.15%-42.62%, soil alkalinity by 24.08%-49.82%, and pH by 0.54-1.06, and increase cation exchange capacity by 10.45%-32.29%. Compared with conventional fertilization, the application of organosilicon soil conditioner could also increase rice plant height by 14.72%-23.09%, ear number by 20.92%-29.23%, grain number per ear by 3.15%-11.45%, 1000-grain weight by 3.61%-5.58%, and rice yield by 30.07%-56.60%. The above results show that the application of organosilicon soil conditioner could not only improve the physical and chemical properties of soda-type saline-alkali soil, but also ameliorate the biological properties of rice and increase the rice yield, and the technology can be reproduced and popularized for improving soda-type saline-alkali soil.

  Planting Patterns: Effects on Soil Quality and Growth Characteristics of Xanthoceras sorbifolia ZHANG Li, XU Yunfei, YIN Jian, GU Caihua, ZHAO Min, LI Huanhuan, WANG Jing, REN Bin 2021, 11 (12):  64-67.  DOI: 10.11923/j.issn.2095-4050.cjas20191100274 Abstract + ( 318 )   HTML ( 7 )   PDF ( 1246KB )   ( 183 ) The paper aims to study the effects of planting patterns on the growth of Xanthoceras sorbifolia and soil physical and chemical properties, and provide a basis for scientific planting of X. sorbifolia. A field experiment was conducted with two treatments of bed-planting practice (BP) and flatting planting practice (FP). The morphological characters and biomass of the seedlings, soil bulk density (BD), soil water content (SWC), soil pH, contents of soil organic matter (SOM), available nutrients were measured. The results showed that: (1) BD and SWC in 0-20 cm and 20-40 cm soil layer were significantly lower under BP than those under FP, and BP significantly increased soil total porosity and aeration porosity; (2) BP increased the contents of SOM and available nutrients, especially in 20-40 cm layer, compared with those of FP, the contents of SOM, available N, available P and available K within the 20-40 cm soil layer under BP significantly increased by 117.05%, 53.06%, 28.31% and 23.40%, respectively; (3) BP significantly increased root length, branch number, green leaves area; the aboveground biomass and root dry biomass and the shoot/root ratio was 121.20%、46.15% and 51.19% higher those of FP, respectively. Based on the study, bed-planting practice can improve soil structure and fertility and is more suitable for cultivating X. sorbifolia.

  Hybrid Seed Production of Brassica napus L.: Isolation Effect Comparisons of Different-density Nets WEN Yancheng, ZHANG Shufen, HE Junping, CAI Dongfang, ZHU Jiacheng, WANG Jianping, CAO Jinhua, HU Kun, ZHAO Lei, WANG Dongguo 2021, 11 (12):  68-73.  DOI: 10.11923/j.issn.2095-4050.cjas20200300052 Abstract + ( 285 )   HTML ( 7 )   PDF ( 1437KB )   ( 332 ) The objective of this study is to investigate the effect of nylon net density on seed production of Brassica napus L. Polima cytoplasmic male sterile (Polima CMS) line and a radish cytoplasmic male sterile (Ogu CMS) line of Brassica napus L. were used as materials. The effects of nets on the light, temperature, humidity, the incidence of Scleritinia sclerotiorum and seed-production yield were investigated. The results were as following. (1) Light intensities in the nets decreased significantly along with the increase of net densities. (2) The temperature in all nets raised, but some of the temperature increase did not reach a significant level. (3) Humidity in most nets increased with the increase of net density, but there were some exceptions. (4) The incidence of Scleritinia sclerotiorum increased with the increase of net density. (5) Even the densest net (160 net mesh number per square inch (NMNPSI)) could not prevent outside pollens entering into the nets. (6) Of the same density nets, the decrease rate of hybrid yield of Polima CMS lines was similar to that of Ogu CMS lines. Consequently, the effects of net density on both Polima CMS and Ogu CMS are similar, the present popular densities of nets are not enough to prevent outside pollens entering into nets.

  Effects of Salt Stress on the Growth and Photosynthetic Characteristics of Squash Seedlings SHI Pibiao, JIANG Runzhi, SHEN Mingchen, GU Minfeng, WANG Chunyun, LI Yafang, GU Xiaobing 2021, 11 (12):  74-79.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0193 Abstract + ( 291 )   HTML ( 7 )   PDF ( 1451KB )   ( 251 ) To study the tolerance of squash to salt stress, hydroponics was adopted to investigate the effects of different concentrations of NaCl (0, 50, 100, 150, 200 and 250 mmol/L) on the growth and photosynthetic characteristics of squash seedlings. The results indicated that with the increase of NaCl concentration, the plant height, fresh weight and dry weight of squash seedlings gradually declined. The chlorophyll content, stomatal conductance (Gs), net photosynthetic rate (Pn) and transpiration rate (Tr) first increased and then decreased with the NaCl concentration increase. With the increase of NaCl concentration, the relative ionic permeability (RIP) showed a trend of first decrease and then increase. There was no significant effect on the growth of squash seedlings when NaCl concentration ranged from 0 to 100 mmol/L, but when NaCl concentration was higher than 100 mmol/L, the survival rate and photosynthesis were significantly affected. The study demonstrates that squash has strong salt tolerance.

  Effect of Rain-shelter Cultivation on Grapevine Canopy Microclimate and Soluble Solid Content of Grape SUN Enhong, ZHANG Kai, HAN Xu, WU Qiang, YE Kun, ZHANG Jianping 2021, 11 (12):  80-86.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0227 Abstract + ( 257 )   HTML ( 7 )   PDF ( 1617KB )   ( 299 ) Taking Chongqing as the study area in consideration of its hot and humid climate in summer, the study aims to clarify the influence of rain-shelter cultivation on grapevine canopy microclimate and soluble solid content of grape, and provide a theoretical basis for the scientific layout, sustainable management and production capacity enhancement of grape industry. The climate factors were monitored continuously from 2016 to 2017, such as wetness, temperature, and light intensive. Grape soluble solid content was also measured in rain-shelter cultivation and outdoor cultivation during grape maturity. The results showed that the rain-shelter cultivation could provide a more suitable humidity environment for grape compared with the outdoor cultivation. The humidity of grape leaves ranged from 256 to 275. The highest temperature of grape leaves was 28℃ (rainy day)-38℃(sunny day) in rain-shelter cultivation less than 32℃(rainy day)-42℃(sunny day) in outdoor cultivation. Light intensive in the rain-shelter cultivation was significantly less than that in outdoor cultivation. The shading rate was 26.5%-37.8%. ‘Xiahei’, ‘Red Fuji’, ‘Victoria’ and ‘Hutaibahao’ had higher soluble solid content in rain-shelter cultivation than in outdoor cultivation. The main climate factors of rain-shelter cultivation, such as humidity, temperature and light intensity, were better for the formation and accumulation of soluble solid in grape. The rain-shelter cultivation was more suitable for the development of grape industry in Chongqing and similar areas with high temperature and more rain in summer.

  The Changing Trend of Volatile Components in ‘Yellow Fuji’ Apple Under Hypoxia Condition LI Hengwei, WANG Qingguo 2021, 11 (12):  87-94.  DOI: 10.11923/j.issn.2095-4050.cjas2021-0131 Abstract + ( 303 )   HTML ( 4 )   PDF ( 1580KB )   ( 273 ) The purpose of this study is to determine the changes in volatile product contents of ‘Yellow Fuji’ apples under hypoxic condition, analyze the relationship between the changes in volatile components and hypoxia injury, and provide a basic method for early warning of hypoxic injury of apples and ensuring the quality of controlled atmosphere storage. The extraction was carried out with solid phase microextraction (SPME) technology, the analysis of volatile components in 2, 4, 6, 8 and 10 days under hypoxic condition was conducted by using gas chromatography-mass spectrometry technology. The study found that with the prolonged period of hypoxia, the contents of a total of 18 volatile components in apple decreased, and the contents of 6 volatile components increased. 24 volatile components screened out were related to hypoxia injury. The study could provide certain references for further screening of hypoxia early warning indicators and research on the mechanism of hypoxia injury.

  Mulberry Straw Substrates: Effects on Fruiting Traits of Lentinus edodes HU Guiping, HUANG Jinzhi, WANG Yawei, ZHANG Cheng, SHI Xuping, WANG Feng, ZHANG Guobiao, CAO Hongmei 2021, 11 (12):  95-99.  DOI: 10.11923/j.issn.2095-4050.cjas20191200294 Abstract + ( 247 )   HTML ( 6 )   PDF ( 1233KB )   ( 303 ) The effect of mulberry straw substrates on fruiting traits of Lentinus edodes was explored. ‘Ming60’ was taken as the L. edodes variety, and conventional sawdust formula was used as the control, including 80% sawdust, 18% bran, 1% gypsum and 0.5% mushroom element. Mulberry straw substituting sawdust with different proportions of 5%, 15%, 25%, 35%, 50%, 75% and 100% were set in this experiment to broaden the practical scope of mulberry straw substrates for edible fungi cultivation. The results showed that the average mycelium growth rate presented a trend of increase first and then decrease along with the increase of substitution rate. Time from inoculation to end of mycelia, fresh mushroom production per bag, pileus weight, pileus thickness, pileus diameter, stipe length, and fruit body weight were inversely proportional to mulberry straw substitution rate, but the mushroom shape and color were not affected. And at the same time, when the proportion of mulberry straw substitution was 5%-50%, the growth traits, commodity characteristics and economic benefit of mushroom were significantly better than those of the control group, and the effect reached the best when the proportion of mulberry straw substitution was 15%.

  Experimental Rearing Effects of a New Breed of Hybrid Yellow Catfish: An Evaluation SONG Limin, ZHANG Wei, LIU Xiaolian, XU Xiaoli, JIANG Jufeng, JIAO Wanming, KAN Zheng, YANG Wenying, WU Huimin 2021, 11 (12):  100-104.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0235 Abstract + ( 312 )   HTML ( 6 )   PDF ( 1321KB )   ( 307 ) To improve the germplasm of yellow catfish (Pelteobagrus fulvidraco) under cultivation in Tianjin and increase the economic and ecological benefit of the cultivation, a new breed of hybrid yellow catfish ‘Huangyou 1’ was introduced to Tianjin in 2019 by the research group. The growth, disease resistance and production of nitrogen and phosphorus were studied systematically by comparing characters. The results showed that the growth rate and weight gain rate (WGR) of hybrid yellow catfish were significantly higher than those of common yellow catfish (P<0.05), and the feed conversion ratio (FCR) was lower than that of common yellow catfish, but the difference was not significant (P>0.05); the main death diseases of hybrid yellow catfish were body surface ulceration and gill rot. There was no significant difference in the incidence of body surface ulceration between hybrid yellow catfish and common yellow catfish (P>0.05). The incidence of gill rot in hybrid yellow catfish was significantly higher than that of common yellow catfish (P<0.05), while the incidence of other diseases was significantly less than that of common yellow catfish (P<0.05). The total survival rate of hybrid yellow catfish was significantly higher than that of common yellow catfish (P<0.05). The increment of ammonia nitrogen, nitrite and total phosphorus in the tail water by gaining 1 kg body weight of hybrid yellow catfish was significantly lower than that of common yellow catfish (P<0.05). Although the increment of total nitrogen in the tail water by gaining 1 kg body weight of hybrid yellow catfish was also less than that of common yellow catfish, the difference was not significant (P>0.05). Therefore, the characters of growth, disease resistance, nitrogen and phosphorus production per unit weight gain of hybrid yellow catfish ‘Huangyou 1’ are better than those of common yellow catfish, and hybrid yellow catfish ‘Huangyou 1’ is suitable to be popularized and cultured in Tianjin.

  Effect of Two Fresh-keeping Treatments on Strawberry Storage LI Wenfen, TAN Yuting, ZENG Xianqiang, WANG Bo 2021, 11 (12):  105-108.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0089 Abstract + ( 290 )   HTML ( 8 )   PDF ( 1284KB )   ( 229 ) The paper aims to solve the problem of rotten strawberry fruit. The strawberries were soaked in glycyrrhiza extract, calcium lactate solution and distilled water for 1 min, then dried and stored at room temperature. The weight loss rate, decay rate, soluble sugar content, vitamin C content and SOD activity of 3 treatment groups were analyzed. Compared with the control group, after 7 days storage, the weight loss rate of strawberry in the glycyrrhiza extract group decreased by 34.72%, the decay rate decreased by 31.56%, the soluble sugar content increased by 99.10%, the vitamin C content increased by 154.55% and the SOD activity increased by 206.24%, and there was no significant difference between calcium lactate treatment and glycyrrhiza extract treatment (P>0.05). During the experimental period, both the two methods can improve the fresh-keeping effect of strawberry.

  Current Situation of Selenium-enriched Crops Research in China Based on Bibliometric WU Wenjiang, WANG Lei, MENG Haijun, JIE Bo, CHEN Guoxiu 2021, 11 (12):  109-117.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0273 Abstract + ( 357 )   HTML ( 4 )   PDF ( 1288KB )   ( 277 ) A bibliometric analysis was conducted to study the current situation and development trend of selenium-enriched crops research in China, the research papers were from CNKI and SCI-E database. The results show that 1085 papers were published from 1992 to 2020 and the annual quantity of papers published increased year by year, what’s more, 67.0% of the papers were published from 2010 to 2020, and the number of SCI papers increased year by year. The Huazhong Agricultural University, Nanjing Agricultural University, Northwest A & F University, China Agricultural University and Chinese Academy of Agricultural Sciences are the institutions which have strong scientific research strength and academic influence. The main research topics for selenium-enriched crops in China are from 8 aspects: the effects of selenium on growth, yield and quality of crops; selenium uptake, transport and distribution in crops; the antagonism of selenium to cadmium, lead and mercury and other toxic element in crops; the antioxidant activity of selenium in crops; the effects of selenium on photosynthesis in crops; selenium types and content in selenium-enriched crops; the interaction of selenium with zinc, molybdenum, sulfur and other elements and the molecular mechanisms of selenium-enriched crops. In general, the number of SCI papers on selenium-enriched crops research has increased year by year in China, and the academic influence of China is rising; the trend of research on selenium-enriched crops in China has shifted from the physiology and biochemitry to molecular biology.

  The Research Contexts of Preventing Poverty-returning Risks Through the Whole Process of “Before, During, After the Event” for the Population out of Poverty LIAO Bing 2021, 11 (12):  118-124.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0233 Abstract + ( 393 )   HTML ( 4 )   PDF ( 1389KB )   ( 423 ) To systematically construct the overall research contexts of poverty-returning risks, the existing research literature in mainstream journals at home and abroad is sorted out by means of literature research and comparative analysis. It is found that there are difficulties as follows. Most objects of the research are poor households but it is difficult to track the change trend of the production and the life of farmers out of poverty. And it is also difficult to prevent and warn poverty in advance instead of combating poverty after the event. The research methods are mostly from single index system method or characteristic index method, which are difficult to draw on each other’s strength. Based on these, the future research contexts of the poverty-returning risks are constructed and the future research trends are summarized as (three transitions): the research focus should be changed from poverty stricken population to population out of poverty and on clarifying the poverty-returning mechanism; the research perspective should be changed from combating poverty after the event to the whole process of “before, during and after the event”; the method should be changed from single index system method or characteristic index method to the a comprehensive method combining indicator system with characteristic indexes.