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湖北省浠水县十月大队位于长江北岸大别山南麓花岗片麻岩低山丘陵区,以栽培水稻为主。该队于1963年全面实行绿肥双季稻两熟制,1965年又开始发展麦子、油菜双季稻三熟制。1972年当水田三熟面积扩大到72%以上时,全年平均亩产达吨粮左右,达到我国当今所总结出的高产水稻土的产量指标。嗣后,虽然这些稻田耕层的氮磷钾主要营养元素的含量仍具有高产水稻土的指标,但对化学氮肥的胃口增大,作物单产徘徊不前,甚致下降。1977-1981年,我们针对该队高产水稻土性状恶化的原因与危害以及稻棉轮作的改土增产效果,进行了定位的田间试验。前三年的研究工作,已报道部份结果,本文
Xishui County, Hubei Province October brigade is located in the southern foot of the Dabie Mountains on the northern bank of the Yangtze River granite gneiss hilly area, mainly to cultivate rice. The team in 1963 the full implementation of green manure double cropping rice two systems, in 1965 began to develop wheat, rape double crop three rice system. In 1972, when the area of paddy fields increased to more than 72%, the average yield per mu reached about one ton of grain per year, reaching the yield index of paddy soils nowadays that have been summed up in our country. Subsequently, although the content of major nutrients of nitrogen, phosphorus and potassium in these paddy fields still had the indicators of high-yielding paddy soil, the appetite for chemical nitrogen fertilizer increased and the yield of crops even stagnated. In 1977-1981, we conducted field experiments targeting the causes and harms of the deterioration of high-yielding paddy soils in the team and the improvement effect of paddy and cotton rotation. The first three years of research work have reported some results in this article