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    This topic focuses on the innovative research results in the field of agroecology reported in Chinese Agricultural Science Bulletin and Journal of Agricultural Science, as well as the agricultural development model of intensive management by using systems engineering methods and modern science and technology. Content in the soil of agricultural production, fertilizer and plant nutrition, and its efficient utilization of water resources, crop water efficient cultivation technology and the mechanism, physiological ecology, agricultural crops resistance physiological ecology, resistance breeding, pest control, biodiversity protection, optimal allocation of resources and benefit analysis, agriculture ecological engineering technology, pollution-free agricultural production technology, agricultural environment pollution prevention and control And agricultural sustainable development, ecological agriculture construction and ecological agriculture demonstration area construction model and typical experience and other aspects of the research report, research brief and summary. Please subscribe and download. (Subscribe by Email Alert. Our website has opened a free Alert service, users can according to their own needs free access to the latest content).

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    Main Cultivars of Chinese Cabbage in Chengdu Plain: Identification and Evaluation of Clubroot Resistance
    Wenxian Wu, Lei Zhang, Xiaoqin Huang, Xiaoxiang Yang, Yong Liu
    Chinese Agricultural Science Bulletin    2020, 36 (10): 127-132.   DOI: 10.11924/j.issn.1000-6850.casb19010152
    Abstract （780）   HTML （28）    PDF（pc） （1181KB）（122）       Save

    To clarify the resistance level of Chinese cabbage varieties against clubroot in Chengdu plain, a total of 45 main cultivars of Chinese cabbage were screened for resistance in three counties, Longxing in Chongzhou, Mengyang in Pengzhou and Taixing in Xindu in 2018. The identification was carried out under field condition by using the method of natural infection, and the resistance level analysis was conducted by investigating the symptom on plant roots. The results showed that the resistance level of the tested Chinese cabbage cultivars to clubroot disease was variable. Four cultivars showed immune to clubroot (disease index=0) in the Chongzhou natural disease nursery, and the ratio was 8.9%, and the other cultivars showed susceptibility (35<disease index≤55) or high susceptibility (55<disease index≤100), accounting for 91.1%. The evaluation of resistance identification in Pengzhou showed that six cultivars were immune to clubroot, eleven cultivars were tolerant to clubroot disease (15<disease index≤35), and the remaining twenty eight cultivars were susceptibility or highly susceptibility. But in Xindu, only two cultivars showed immune resistance, sixteen tolerant cultivars were screened out and twenty six cultivars showed susceptibility or high susceptibility. The resistance of most of the cultivars was susceptible to clubroot, and the resistance of some cultivars showed instability in different areas. Only cultivar Meichun and Shangpin exhibited stable immune to clubroot in the three regions, which were suitable for planting in the epidemic areas of clubroot disease, and could be used for further study on resistance breeding.

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    A Review of Relationship between Citrus Growth and Environment
    Lizhenlun，Xiedeti
    Chinese Agricultural Science Bulletin    2003, 19 (6): 181-181.   DOI: 10.11924/j.issn.1000-6850.0306181
    Abstract （2075）      PDF（pc） （329873KB）（1088）       Save
    Ontogeny and astogeny of citrus tree is the result of interaction and adaptation each other between the interior factors of plant and the exterior conditions. According to the latest researches, this Paper elaborated the relationship between citrus and sunlight, temperature, precipitation, humus, soil element, soil pH, soil texture and structure, soil microorganism and topography.
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    Chinese Agricultural Science Bulletin    2004, 20 (1): 126-126.   DOI: 10.11924/j.issn.1000-6850.0401126
    Abstract （1245）      PDF（pc） （88625KB）（712）       Save
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    Chinese Agricultural Science Bulletin    2004, 20 (1): 217-217.   DOI: 10.11924/j.issn.1000-6850.0401217
    Abstract （1461）      PDF（pc） （140611KB）（928）       Save
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    Chinese Agricultural Science Bulletin    2004, 20 (1): 83-83.   DOI: 10.11924/j.issn.1000-6850.040183
    Abstract （1538）      PDF（pc） （94488KB）（676）       Save
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    The Influence of Different Ecological Condition on Growth and Yield of High Starch Corn Variety Zhengdan 18
    Wang Zhenhua,Zhang Xin,Liu Wencheng,Tian Jifeng,Zhang Qianjin
    Chinese Agricultural Science Bulletin    2004, 20 (1): 98-98.   DOI: 10.11924/j.issn.1000-6850.040198
    Abstract （1613）      PDF（pc） （98537KB）（608）       Save
    The influence of different ecological condition on growth and yield of Zhengdan 18 was studied. The yield, ear row number and row grain number dropped, the maximum leaf area index declined, the growing process quickened, the growing time became short, along with the postponement of summer sowing. The ecological adaptability for high yield of Zhengdan 18 was that whole growing accumulated temperature was 2674.9-2860.6℃ and whole growing daily mean temperature was 24 .8-25.8℃.
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    The Application of Rice Blast Vaccine Inoculation Method On The Identification of Blast Resistant
    Zhang Yuhua
    Chinese Agricultural Science Bulletin    2004, 20 (2): 198-198.   DOI: 10.11924/j.issn.1000-6850.0402198
    Abstract （1574）      PDF（pc） （152707KB）（713）       Save
    The rice blast vaccine inoculation method was adopted to identify the blast resistant of rice varieties (lines) cultivated in Heilongjiang province. The field microclimate was artificially controlled in order to create a set of measure of higher incidence of rice blast, easier operation, bigger capacity of nursery and reliable identification result. In the last fewer years, we screened a batch of germplasm with higher value of application, systemic material with well resistance and few varieties.
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    Water equilibrium features and ecological adaptability of dry-land crops in the loess hilly areas of southern Ningxia
    WANG Long-chang， WANG Li-xiang BIAN Xin-min
    Chinese Agricultural Science Bulletin    2004, 20 (2): 232-232.   DOI: 10.11924/j.issn.1000-6850.0402232
    Abstract （1526）      PDF（pc） （231289KB）（721）       Save
    Based on the experimental results, this paper analyzed the water equilibrium features and ecological adaptability of the dry-land crops in the loess hilly areas of south Ningxia. The results showed that the water satiety rate of whole growth period of summer crops was 55.9%~63.8% in the dry year and 84.1%~86.4% in the rainy year, and that of autumn crops was 67.7%~79.0% and 92.1%~95.1% respectively. The water ecological adaptability varied with the difference of crops and rainfall condition. The water ecological adaptability index (WEAI) of autumn crops was higher than that of summer crops, and the WEAI of crops in the rainy year was higher than that in the dry year. The WEAI of 6 main crops could be put in order as: millet＞potato＞panic＞flax＞pea＞spring wheat. The study results may provide theoretic basis for drawing up the decision scheme of cropping system in dry-land regions.
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    Fertility Variation of Wheat Photoperiod–sensitive Male Sterile Line (A31) in Different Ecological Areas
    MA Ling-jian, HE Pei- ru , SONG Xi-yue , HU Yin-gang
    Chinese Agricultural Science Bulletin    2004, 20 (2): 76-76.   DOI: 10.11924/j.issn.1000-6850.040276
    Abstract （1559）      PDF（pc） （203704KB）（571）       Save
    Through observing fertile changes of A31 by the fertility experiments in 7 different ecological areas. the result showed that the male fertility of A31 will decline when the day length becomes shorter. The day length is the major cause of fertile changes of A31.The male fertility of A31 is also sensitive to the temperature. The critical day-length of fertile changes of A31 is about 14.5 hours.
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    Chinese Agricultural Science Bulletin    2004, 20 (3): 104-104.   DOI: 10.11924/j.issn.1000-6850.0403104
    Abstract （1306）      PDF（pc） （1063652KB）（565）       Save
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    Chinese Agricultural Science Bulletin    2004, 20 (3): 204-204.   DOI: 10.11924/j.issn.1000-6850.0403204
    Abstract （1153）      PDF（pc） （944903KB）（721）       Save
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    The Current Eutrophication Status of Taihu Lake and Its Ecological Control Countermeasures
    ZHANG Guang-sheng, WANG Ming-xing, YE Ya-xin, ZHU Cheng-dong, SONG Zhao-xia, ZHOU Qing,
    Chinese Agricultural Science Bulletin    2004, 20 (3): 235-235.   DOI: 10.11924/j.issn.1000-6850.0403235
    Abstract （1694）      PDF（pc） （1235139KB）（660）       Save
    As the high-speed development of industry and agriculture, non-controlled eduction of live sewage, relative lag of cure of water pollution and its own water character, the current eutrophication status of Taihu lake, the mostly component of Taihu valley, is dangerous and has endangered the economy development and people’s natural life in the Taihu valley. The eutrophication of Taihu lake is a representative ecological problem, so it can be controlled by some ecological control countermeasures, such as resuming aquicolous vegetation, restricting the area of breed aquatics in the Taihu lake, biologically manipulating alga, building ecological agriculture section around the Taihu lake and resuming the zoology of Taihu bank .
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    Chinese Agricultural Science Bulletin    2004, 20 (3): 242-242.   DOI: 10.11924/j.issn.1000-6850.0403242
    Abstract （1364）      PDF（pc） （937595KB）（519）       Save
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    Chinese Agricultural Science Bulletin    2004, 20 (3): 244-244.   DOI: 10.11924/j.issn.1000-6850.0403244
    Abstract （1324）      PDF（pc） （930273KB）（478）       Save
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    Study on the Main Factor of Wheat on Different Ecological Conditions
    SUN Quan-de,LI Hong-bin,YANG Tai-xin ,WANG Xin-min,LI Jin-sheng
    Chinese Agricultural Science Bulletin    2004, 20 (4): 123-123.   DOI: 10.11924/j.issn.1000-6850.0404123
    Abstract （1661）      PDF（pc） （519314KB）（624）       Save
    According to the path modle of causality within the compositive factors of wheat yield,the main factor could be decided through calculating and comparing the total of effect and the total decided level of every factor to yield.On the condition, higher level of the soil fertility with plenty water and fertilizer, and wheat plangted after rice by rotary tillage and broadcast sowing,the main factor was kernel number per spike.On the condition of less water and fertilizer, the main factor was kernel weight. On the condition of sandy and leaking soil, the main factor was spike number.
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    Chinese Agricultural Science Bulletin    2004, 20 (4): 47-47.   DOI: 10.11924/j.issn.1000-6850.040447
    Abstract （1557）      PDF（pc） （872391KB）（1090）       Save
    soil-ecosystem has done much with the stability of agriculture,recently the facts influencing the function of soil-ecosystem were not restricting in polluting from physical or chemical sources ,the GM technic applying in agriculture not only made the pumping harvest in agriculture ,but produced the more serrious harm: biological pollution.
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    Organic Agriculture and Soil Biodiversity
    Chinese Agricultural Science Bulletin    2004, 20 (4): 80-80.   DOI: 10.11924/j.issn.1000-6850.040480
    Abstract （1778）      PDF（pc） （631130KB）（982）       Save
    The paper overviewed the relationship of organic agriculture and soil ecosystem, soil is living soil, nurtures depended on soil biodiversity for organic agriculture , soil management affected soil ecology, put forward the methods for build healthy soil.
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    The Evaluation Index System and Its Application of Eco-agriculture County ——The problems of evaluation criteria of ecological,economic and social effects in the construction of eco-agriculture
    Lin Zhonghua
    Chinese Agricultural Science Bulletin    2004, 20 (5): 238-238.   DOI: 10.11924/j.issn.1000-6850.0405238
    Abstract （1676）      PDF（pc） （1184591KB）（798）       Save
    In this paper，26 factors of ecological，economic and social environment indexes of the evaluation index system of eco-agriculture county were discussed，the determinate weight scales and calculating approaches of every item and sub-factor were accounted for，and the connotation of ecological economy of every index was also explained，This evaluation index system was applied in the evaluation of 3 years constructional result in 14 eco-agriculture counties，It has an important directive significance in the normalization and judgment of eco-agricultural construction level in a region of county class and quickening the development speed of eco-agriculture to a higher level.
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    The study of Ecology Environment and Competition Power of Western City
    Liu Chao
    Chinese Agricultural Science Bulletin    2004, 20 (5): 287-287.   DOI: 10.11924/j.issn.1000-6850.0405287
    Abstract （1558）      PDF（pc） （1314723KB）（721）       Save
    The good and bad of ecology environment of western city affect the breeding and raise of competition power of western city, and powerful city competition power has important strategy sense to speedup the progress of western city and accelerate the equilibrium continued development of nationwide economy. Strengthening the ecology environment construction of western city must pay attention to: persisting the ideal of development persistently, averting “alone economy development” ideal; speedup the pace of countryside urbanization, easing the population to the pressure of city′s area environment; vigorously developing environment property, building ecology cities; pursuing the system of the assessing of invest item, guaranteeing the invest items of western cities to acquire economic results, ecological results and social results; strengthening the dynamics of ecology environment′s supervising, eliminating the source of pollution of the environment.
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    Study on the relationship between the resistance of different tomato varieties to ToMV and the activities of oxidase
    Li Huanxiu,，Su Junzhi，Bian Qingshan
    Chinese Agricultural Science Bulletin    2004, 20 (6): 19-19.   DOI: 10.11924/j.issn.1000-6850.040619
    Abstract （1850）      PDF（pc） （1293683KB）（803）       Save
    Two weeks after inoculation with ToMV, the activities of POD, PPO and PAL, and changes in peroxidase isozyme patterns in six varieties of tomato with different levels of resistance were analyzed. The result show that the levels of POD, PPO and PAL activity in inoculated plants were higher than that in noninoculated ones, that the more susceptible the variety, the more its changes in inoculated plants. There were two new isozyme bands appeared in susceptible variety, and only one new isozyme band appeared in resistant variety.
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