PRIMARY ANALYSIS OF THE RELATIONSHIP BETWEEN DIFFERENT FERTILIZING WAY AND YIELD IN THE BLACK EARTH ZONE OF THE SONGNEN PLAIN
Zhang Qing (General Station of Environment Monitoring Ministry of Agriculturc,Tianjin,300191)Hou ZhongtIan;Liu Yongli;Wang Hongyan (Northeast University of Agriculture,Harbin, 150030)
Based on the theory of agriculture ecosystem and by using the rotation design mathemat ics method which takes the combination design as its theoretical basis,with superiority of the computer in analyses and graphs-showing,the relationship of experiment factors with crop yields is analyses.The result shows that the average yield of many years is higher than the contrast.Farmyard manure can not only provide nutrients mr the crop needed but also improve the stability of the soil ecological system ,Average yield of the highest chemicial fertilizer regions and the lowest regions changes slightly.In drought years,contribution of farmyard manure is greater than that of chemicial fertilizer, in years with sufficient rain,the contribution of chemicial fertilizer is greater than that of farmyard fertilizer. It shows the characteristies of available fertilizer.Too much amount of straw returning to the field will result in negative effeet,The straw aggravates dry degree specially in dry years,with farm yard manure and chemicial fertilizer. this negative effect can be buffered.This study show quantitive optimum fertilizer proportion of getting highest yields.
【CateGory Index】： S158.3