Current issue

• 2017 Vol.7 No.5 Published:26 May 2017

  Effect of Functional Leaves on Grain Filling in Wheat 范华 2017, 7 (5):  1-5.  DOI: 10.11923/j.issn.2095-4050.cjas17010025 Abstract + ( 2033 )   PDF ( 1197KB )   ( 763 ) The objectives of this study are to analyze the correlation between functional leaves and main grain filling parameters in wheat, and provide references for high-yield breeding of wheat in Shanxi. A total of 51 wheat cultivars from Shanxi Province were used as materials to fit the change regularity of dry weight of grain after flowering using the Logistic equation, and the correlation between main filling parameters and functional leaves was analyzed. The results showed that the main filling parameters were Wt1, Wt2, Wt3, W2, W3, V3, Vm, V2 and Va, correlations between flag leaf inclination and Wt1, Wt2, Wt3, and W2 were significant; the flag leaf area was significantly correlated with Wt1, Wt2, and W2; the second leaf area was significantly correlated with Wt1, Wt2, W2 and Va; significant correlations existed between the spike grain weight/flag leaf area (SGW/FLA) and Wt2, W2 and Va. In high-yield breeding of wheat, we should pay attention to the investigation and selection of flag leaf inclination, flag leaf area, the second leaf area and the spike grain weight/flag leaf area in order to obtain the best filling effect and lay a foundation for high yield breeding of wheat.

  Forecast Techniques of Southern Rice Black-streaked Dwarf Virus 2017, 7 (5):  6-9.  DOI: 10.11923/j.issn.2095-4050.cjas16120013 Abstract + ( 1225 )   PDF ( 1147KB )   ( 617 ) The effect of two mathematical models on southern rice black-streaked dwarf virus was studied to provide reference for the prediction of the disease. Based on the original data of Incidence of late southern rice black-streaked dwarf virus in Huazhou City, Guangdong Province, Polynomial regression method and Grey system GM (1,1) prediction method are applied to build the prediction model of southern rice black-streaked dwarf virus incidence rate and to analyze the prediction results. The results show that, the late southern rice black-streaked dwarf virus incidence prediction models established by polynomial regression and grey system GM (1, 1) are: y=5.2530-5.8923x 2.1280x2-0.1559x3 and y(1)(k 1)=-51.1797e-0.4798k 66.8097. The two prediction models can well predict the incidence trend of southern rice black-streaked dwarf virus, and provide an accurate and effective method for the prediction of the disease. The predictive model can be applied to the project of disease prevention and mitigation.

  Variation Analysis of Soil Microelement in Panzhihua Tobacco-growing Area 2017, 7 (5):  10-14.  DOI: 10.11923/j.issn.2095-4050.cjas16100021 Abstract + ( 1201 )   PDF ( 1165KB )   ( 769 ) To make clear the changing trend of soil microelement in Panzhihua tobacco-growing area, 170 soil samples of top layer were detected and analyzed based on soil data from 2009 to 2010. The results showed that compared with five years ago, the average content of soil available Zn decreased by 13.5%, in which, that of Miyi County increased by 37.4%, that of Yanbian County and Renhe County reduced by 15.6% and 38.2%, respectively. Soil available B in Panzhihua increased by 30%, according to the classification of soil available B, 72.29% of the soil in Panzhihua was lack of available B, and the available B lacking area proportion in Renhe, Miyi and Yanbian tobacco-growing area was 70.58%, 61.23% and 63.75%, respectively. Soil water soluble Cl content decreased by 29.02% in Panzhihua tobacco- growing area, but that in Miyi Country increased by 27.04%, and that in Yanbian and Renhe decreased by 38.2% and 33.8%, respectively.

  Sustainable Management of Forest Resources: A Case of Yanqing District 2017, 7 (5):  15-18.  DOI: 10.11923/j.issn.2095-4050.cjas16050014 Abstract + ( 941 )   PDF ( 1283KB )   ( 629 ) Based on analysis of the previous and current situation and the problems of the forest resources in Yanqing district of Beijing, the author made a preliminary study on how to manage the forest in sustainable way. The conception of sustainable development of forestry emphasizes and features the principle of classification management and the organic and harmonious relationships among forest cultivation, forest utilization and forest protection. As a pilot unit of sustainable management of the national-level forest resources, Yanqing district forest types are various, and the research of regional features and types in forestry plays a significant role in promotion of modern Gardening and Greening development in Yanqing district.

  Comprehensive Utilization of Straws: Transfer Mode in Huang-Huai-Hai Region 2017, 7 (5):  19-22.  DOI: 10.11923/j.issn.2095-4050.cjas16080023 Abstract + ( 1510 )   PDF ( 1125KB )   ( 662 ) The paper aims to discuss the means of improving straw use efficiency in Huang-Huai-Hai Region, the authors summarized straw treatment utilization approaches from researches at home and abroad. The authors found that straws were periodic surplus and unbalanced in location, and due to the limit of technologies, transportation and storage, the utilization of straw was inefficient in the region. Therefore, a transfer model, which contains“field- transfer station- factories/farmers”, in Huang- Huai- Hai Region is needed, which can connect the farmland and the factories and farmers in straw utilization processes. The straw will be pretreated and roughly processed in the transfer station, thus reduce the burning rate and promote straw returning to field appropriately. The transfer model can increase the degree of resource utilization, and deals with the unbalanced spatial and temporal distribution of straw to a certain level. However, the national policy concerning the model is still lacking, and the study on the relationship of the transfer model and agricultural production and operating procedures should be enhanced.

  Correlation of Fruit Cracking and Mineral Nutrient Content in Apricot 田永强,戴桂林,, and 2017, 7 (5):  23-27.  DOI: 10.11923/j.issn.2095-4050.cjas16110014 Abstract + ( 787 )   PDF ( 1217KB )   ( 847 ) This paper aims to clarify the effects of mineral nutrient contents on fruit cracking in order to provide certain references for further study on fruit cracking in apricot and basis for reasonable fertilization in the production. 39 years old apricot trees were used in the test. The row and plant spacing of apricot trees was 3.0 m×4.0 m. The effects of 7 mineral elements on fruit cracking in apricot were analyzed. Correlation between fruit cracking and mineral nutrient content in apricot was in an order as Ca＞Zn＞Mn＞Fe＞K＞Mg＞Cu. There was a negative correlation between Ca and fruit cracking, and the correlation coefficient was relatively high, Zn and Mn had a low correlation with fruit cracking, but there was no obvious correlation between Fe, K, Mg, Cu and fruit cracking. This study showed that the main factor affecting fruit cracking was calcium deficiency.

  Optimum Formula of Hydroponic Nutrient Solution for Low Nitrate Leaf Vegetables 2017, 7 (5):  28-32.  DOI: 10.11923/j.issn.2095-4050.cjas16120018 Abstract + ( 980 )   PDF ( 1234KB )   ( 1742 ) To solve the problem of high nitrate content in leaf vegetables, this research used NFT (nutrient film technique), different kinds of leaf vegetables yield and quality was tested by using different nutrient solution formula. The results showed that lettuce yield was the highest by using the nutrient solution of formula 3（the highest content of Mg2 ）, each crop area could reach 17556 kg/hm2，the relative increase rate reached 133.3% and 171.42% respectively which was compared with other two kinds of formula. The root volume, content of chlorophyll, total fresh weight, leaf number, plant dry weight of lettuce index was better by using formula 3 than the other two kinds of formula. Quality testing results showed that nitrate content of lettuce was 745.46 mg/kg which was the lowest by using nutrient solution formula 3, and nitrate content of lettuce reduced by 77.01% and 79.78% respectively than the other two kinds of formula (the highest content of K and Ca2 ). cultivation Vc content of the lettuce was the highest by using nutrient solution formula 3 which increased by 22.36% and 78% respectively compared with other two kinds of formula, and the sugar acid ratio increased significantly which could improve the quality of lettuce effectively. Comprehensive results of quality indicators, biological indicators and yield, we obtained formula 3 nutrient solution which was the most suitable for cultivating leaf vegetables such as lettuce, rapeseed and leaf lettuce, it was the optimum leaf vegetables hydroponic nutrient solution formula. Key words: Leaf Vegetables; Hydroponic Nutrient Solution; Low Nitrate

  Night Lighting Effects on Plant Growth 2017, 7 (5):  33-37.  DOI: 10.11923/j.issn.2095-4050.cjas16110027 Abstract + ( 686 )   PDF ( 1175KB )   ( 1313 ) Firstly, we introduced the concept of urban night lighting and common urban greening plants; then, according to urban spatial distribution, we divided the night lighting and urban plants into different categories; finally, using the light source as the starting point, we summarized the plant growth and metabolism in photosynthesis under the light treatments (lighting quality, lighting time or lighting intensity). The current domestic and foreign research progresses in this field were analyzed and the relative deficiency of research on current urban landscape lighting and urban greening plants was pointed out. In conclusion, we put forward suggestions as using field survey and experiments to understand the influence of night lighting on urban greening plants, taking into consideration of the new light source LED, and arranging the urban lighting design for protecting urban greening plants.

  Isatis indigotica in Hexi Corridor: Response of Agronomic Characters, Medical Yield and Quality to Sowing Date 2017, 7 (5):  38-45.  DOI: 10.11923/j.issn.2095-4050.cjas16100029 Abstract + ( 956 )   PDF ( 1282KB )   ( 759 ) To determine the suitable sowing date for high-yield and high-quality cultivation of Isatis indigotica in Hexi corridor, an experiment of different sowing dates of Isatis indigotica was carried out in Minle of Gansu Province in 2014. The agronomic characters, medical yield, quality of Isatis indigotica at different sowing dates were analyzed. Results showed that with the delay of the sowing date, the seedling date and the whole growing date were shortened, and the bolting rate decreased obviously. The seedling emergence days of sowing on May 22 were shortened by 15 d, compared with that of sowing on April 12. The growth period was shortened by 42 d, and the bolting rate dropped by 30%. With the delay of the sowing date, the germination rate significantly increased. April 12 had the lowest seedling emergence rate [(40.57±0.56)%], and the germination rate was above 95% after sowing on May 2. The yield of Radix isatidis (5000.25 kg/hm2) and the content of (R,S)- epigoitrin [0.083 /-0.0012)%] reached the highest level when the sowing was conducted on April 22, and the yield of Folium isatidis was the highest (2034.37 kg/hm2) when the sowing was on May 2, but the sowing date had no significant effect on medicinal water content, extract and ash content of Radix isatidis. The best sowing date of Isatis indigotica was from late April to early May in Hexi Corridor, early sowing and late sowing were not conducive to increasing the yield and quality of medicinal materials of Isatis indigotica.

  Research Advances in Cultivation and Comprehensive Utilization of the Radix Codonopsis lanceolatae 仉劲, and 陈宝芳 2017, 7 (5):  46-49.  DOI: 10.11923/j.issn.2095-4050.cjas17010015 Abstract + ( 710 )   PDF ( 1006KB )   ( 650 ) In this paper,the cultivation and utilization of the Radix Codonopsis lanceolatae was researched, such as the germplasm resources of Radix Codonopsis lanceolatae, the domestication and cultivation of the Radix Codonopsis lanceolatae, the nutrient value utilization of the Radix Codonopsis lanceolatae and the medicinal value of Radix Codonopsis lanceolatae were discussed focus on aspects. In the paper, the problems in the development of the Radix Codonopsis lanceolatae were analyzeed, and puts forward that the development of the Radix Codonopsis lanceolatae can rely on the tourism resources of Mount Tai and with the national policy about the Chinese medicine. In the paper, the way of the development of the Radix Codonopsis lanceolatae may be through the development of products with high nutritional value and medicinal value, and this the way should be used to develop the Radix Codonopsis lanceolatae in the future. We hope that it can provide some references for development of the Radix Codonopsis lanceolatae in the future.

  IT Application Ability of English Teachers: Current Situation and Promotion Strategies Agricultural and Forestry Higher Vocational Colleges in the Internet Era 2017, 7 (5):  50-55.  DOI: 10.11923/j.issn.2095-4050.cjas17020024 Abstract + ( 753 )   PDF ( 1154KB )   ( 743 ) English teachers’IT application ability is the key to realize higher vocational English teaching informatization. Based on questionnaire survey and interviews on the IT application ability of 152 English teachers in agricultural and forestry higher vocational colleges, it was found that: there was a relatively high support level of colleges in software and hardware to enhance teachers’IT application ability, and the higher vocational English teachers had better cognition in the informationization-based teaching, and had positive attitude to its research and innovation, but they were weak in overall IT application ability, and lacked basic knowledge and skill in IT application, and their technology application and research innovation ability in informationization-based teaching could not meet the requirement, particularly virtual simulation technology and other modern teaching means. Aiming at the existing problems, and combining with English teaching practice in higher vocational colleges under the background of internet education, the author puts forward promotion strategies as follows: (1) to strengthen the informationization-based teaching idea; (2) to highlight the special training on IT application ability; (3) to promote the incentive mechanism of IT application ability; (4) to build a teaching and research cooperation community for the higher vocational English teachers; (5) to create the informationization-based English teaching environment with the characteristics of agricultural and forestry vocational colleges.

  Biliometric Analysis of Soil Heavy Metal Pollution Restoration in China 吕凯 and 2017, 7 (5):  56-59.  DOI: 10.11923/j.issn.2095-4050.cjas16110035 Abstract + ( 713 )   PDF ( 1140KB )   ( 809 ) To better understand the status of soil heavy metal pollution restoration in China, a bibliometric study was carried out based on literature in Chinese periodical full text database during 2005-2014. All evaluation indices included annual amount of published articles, journal distribution, core author group, main institution with high amount of article published, fund program, download amount, citation frequency, research hotspot, journal with high amount of article published, etc. The results indicated that during these ten years of 2005-2014, the amount of related literatures and journals increased with years, while the download amount and citation frequency showed a fluctuated decline trend. The two journals of Ecology and Environmental Sciences and Environmental Science Technology had the highest amount of related articles, which was six. The research hotspot of soil heavy metal pollution restoration was soil heavy metal pollution hazard and pollution restoration technology study.

  Climate Change Features in Yunnan from 1961 to 2010 2017, 7 (5):  60-68.  DOI: 10.11923/j.issn.2095-4050.cjas16080027 Abstract + ( 818 )   PDF ( 2619KB )   ( 825 ) The authors analyzed the climate change features in Yunnan in nearly 50 years based on the meteorological data of the average temperature, minimum temperature, maximum temperature and the precipitation from 25 stations in Yunnan during 1961-2010. The results showed that: (1) the warming trend was significant in Yunnan with the heating rate of 0.24℃/10 a; (2) the warming trend was most significant in winter, and the temperature had approximately equal increasing magnitude in spring, summer and autumn; (3) the annual precipitation showed a slight decrease trend, and the change of long- term trend was not significant; the annual precipitation showed a periodic fluctuation change with bigger inter-annual variation; (4) the annual average precipitation days showed a downward trend, thereinto, light rain days decreased most significantly, moderate rain days slightly decreased, heavy rain and storm days presented slightly increasing trend; (5) annual precipitation intensity showed an overall upward trend.

  Coordinative Development of Urban-rural Area and Countermeasures Based on SWOT Analysis: Taking Longchang for an Example 2017, 7 (5):  69-75.  DOI: 10.11923/j.issn.2095-4050.cjas17020029 Abstract + ( 755 )   PDF ( 1756KB )   ( 625 ) To promote the rapid development of rural-urban integration of Longchang, SWOT method was applied to conduct a deep analysis on the status quo of its development of rural-urban integration based on the materials collected in the on-the-spot investigation. The results showed that: Longchang enjoyed a long history of development with favorable traffic location and abundant natural resources, as well as the supports and opportunities brought by the establishment of Chengdu-Chongqing economic zone and the great western development strategy; however, there were also obvious disadvantages, such as unbalanced regional development, low degree of development, the lack of core competitiveness and threats from the competition of other external regions. In light of the results, Longchang is supposed to seize the opportunities brought by the economic cooperation of Chengdu and Chongqing, strengthen the support of technologies and investment, promote coordinated development of three main industries and attach great importance to the ecological environment construction to promote the development of rural-urban integration of Longchang.

  The Research on Increase Farmer’s Property Income Approach 2017, 7 (5):  76-81.  DOI: 10.11923/j.issn.2095-4050.cjas17010003 Abstract + ( 1409 )   PDF ( 1119KB )   ( 645 ) Increasing farmers'' property income plays an important role, in improving the overall income level of farmers and promoting the coordinated development of urban and rural areas. In recent years, farmer''s property income has increased, but the effect of increasing farmers'' income has not been fully reflected. Based on the data of farmers'' property income from 2011 to 2015 of Beijing and the empirical investigation of 3 counties of Beijing, this article analyzes the present situation and the growth potential of farmers'' property income. It shows that the main factors restricting the growth of farmers'' property income are land system, collective distribution system, financial system, the amount of property owned by farmers, the level of education, knowledge and skills related to it. So the government, rural collective economic organizations, financial institutions and individuals should result force, to expand the strength of rural collective economic organizations, revitalize the existing rural homestead, innovative rural financial model, etc. These methods will promote rural land circulation, asset management and money flow of farmers. The improvement of property income will be promoted.

  Impact of mining on farmers’ livelihood strategies in Loess Mount---A case study on Changhe basin in Jincheng City 毕如田,, and 2017, 7 (5):  82-89.  DOI: 10.11923/j.issn.2095-4050.cjas16100033 Abstract + ( 987 )   PDF ( 1192KB )   ( 831 ) The authors carried out a case study on Changhe Basin of Jincheng City, analyzed the influencing factors of farmers’livelihood in loess hilly regions from the perspective of mining. Based on data of 621 questionnaires, the mlogit model was adopted for quantitative analysis of the influencing factors. The study concluded the limiting factors for the development of farmers’livelihood in the loess hilly region and pointed out the corresponding adjustment directions, including the local government’s efforts in promoting agricultural technology, providing training and employment guidance and exploring the characteristic industries according to local conditions, which provided references for the adjustment of agricultural policy in the new rural construction.

  Agricultural Technology Promotion System: Current Situation of Construction and Development Countermeasures in Qingliu, Sanming 2017, 7 (5):  90-95.  DOI: 10.11923/j.issn.2095-4050.cjas16110011 Abstract + ( 794 )   PDF ( 1185KB )   ( 765 ) With the rapid development of China’s economy, agricultural economy has made great progress, which thanks to the support of agricultural technology promotion system, but in the economic system change ceaselessly, some problems about agricultural technology popularization promotion system also gradually revealed. To accelerate comprehensive reform and the construction of basic-level agro-technique extension system, to promote modern agriculture development and the construction of a new type of agricultural promotion system in Sanming, on the basis of the status quo of the agricultural technology promotion system construction in Qingliu, Sanming, this study pointed out main problems of agricultural technology promotion in Qingliu, that was to say, the backward of the team construction of agro-technical promotion, insufficient capital investment, management system and mechanism was not flexible, and methods of work, to improve agricultural technology promotion system construction, to solve these problems from the system innovation, team construction, funds investment and innovation methods, we put forward the corresponding development countermeasure, to promote the rapid development of rural economy.

  Chicken Price and Feed Price: Short-term Dynamic Relationship and Long-term Equilibrium 2017, 7 (5):  96-100.  DOI: 10.11923/j.issn.2095-4050.cjas16120014 Abstract + ( 614 )   PDF ( 1139KB )   ( 725 ) To know the short-term dynamic relationship and long-term equilibrium of chicken price and feed price, based on the analysis of the relationship of chicken price and feed price, we selected chicken price, maize price and legume price from January 2010 to March 2014, used ARDL-ECM model, to determine the short-term dynamic relationship and long-term equilibrium relationship. The results show that maize price and legume price have positive influence on chicken price, and the long-term influence is much greater than the short one. Both the long-term and short-term influence of maize price on chicken price is higher than that of legume price. Based on this conclusion, government can make timely adjustment through regulation and oversight, to stabilize the market price of corn, soybean meal and chicken.