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Studies of production ecology on the rice plant population grown under low pesticide circumstances

低农药条件下水稻群体的生产生态学研究

基本信息

批准号：
04304013
负责人：
MATSUZAKI Akio
金额：
$ 17.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

All over Japan had good weather. much sun-shine and high temperature, during rice growing season. So that rice headed 7-10 days earlier than as usual. Research meetings were held twice, in Yamagata University in July 1994, and in the University of Tokyo in February 1995. Our experimental results showed nearly the same tendency about grain yield against planting density except the university rice field in which rice plant were suffered severe cool temperature damages.1)There was two groups against the planting density and grain yield. In one group, low density plants produced nearly the same level grain yield against the local conventional plant density. On the other hand, low density plants got less yield than the conventional one. These responses occurred to fifty and fifty.2)Fertilizer response to grain yield was consistent through three years. Nitrogen fertilizer showed conspicuous effect to raise grain yield. However, it increased pests and disease damages with increase its application rate. In, reverse, low nitrogen application helped to raise healthy plants, while it reduced grain yield.3)Low pests and disease damage and higher level yield were expected in the combination of lower planting density and moderate nitrogen level of the local conventional condition. In that case, It seems that the condition of relative fertile soil and sufficient temperature for ripening stage were required.

日本各地的天气都很好。水稻生长季节，日照多，气温高。因此，水稻抽穗比往常提前7-10天。研究会议举行了两次，1994年7月在山形大学，1995年2月在东京大学。结果表明，水稻产量与种植密度的变化趋势基本一致，但寒害严重的大学稻田除外。1)种植密度和产量受种植密度和产量影响。在一组中，低密度作物产生的粮食产量与当地常规种植密度几乎相同。另一方面，低密度植株的产量低于常规植株。这些反应发生在50岁和50岁。2)肥料对粮食产量的反应在三年中是一致的。氮肥对提高籽粒产量效果显著。但随着使用率的提高，病虫害也随之增加。相反，低氮有利于健康植株的生长，但降低了籽粒产量。3)较低的种植密度和当地常规条件下的中等氮素水平相结合，有望获得较低的病虫害和较高的产量水平。在这种情况下，似乎需要相对肥沃的土壤条件和足够的成熟期温度。