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近十几年来,苏南太湖稻区提高水稻和三麦的产量主要手段是依靠增施化学氮肥,作为有机肥主要来源之一的绿肥种植面积年年减少.生产上反映.农田土体殭板,耕种费力,养分释放迟缓.为探索上述情况下土壤肥力演变趋向,近几年来我们研究了化学氮肥、氮磷钾混合肥、绿肥、稻草的单独施用,对当季作物产量的影响及对土壤氮素养分的变化作了比较分析.一、试验方法和设计试验自1980年开始,分两部分进行:(1)用盆钵试验来控制测定土壤氮素养分的变化,每季施用不同C/N比肥料,共计稻—麦—早稻—后季稻—麦—稻等六季,研究化肥、绿肥、稻草对土壤氮素平衡作用.
In recent ten years, the main means to increase the yield of rice and wheat in the Taihu Lake region of southern Jiangsu province is to rely on the application of chemical nitrogen fertilizer. The area of green manure as one of the main sources of organic fertilizer is decreasing year by year. In order to explore the trend of soil fertility evolution in the above circumstances, we studied the effects of chemical nitrogen fertilizer, NPK fertilizers, green manure and straw alone on the crop yield in recent years, Nitrogen nutrient changes made a comparative analysis.First, the test method and design test since 1980, in two parts: (1) the use of pot test to control soil nutrient changes in the soil, the application of different C / N ratio of fertilizer, a total of rice - wheat - early rice - after the rice - wheat - rice and other six seasons, the study of chemical fertilizers, green manure, straw on soil nitrogen balance.