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苏州地区七十年代中后期以后,氮肥用量大、增产效果小、经济效益低的问题日益突出.两年来针对几种主要类型土壤,多点进行了稻麦氮素化肥合理施用技术的研究.1980年前季稻试验结果见Ⅰ报(见本刊1981年第2期).本文是两年来试验结果的综述.一、试验方法和经过继续按统一设计进行田间3重复小区试验.氮肥用量为硫铵40～100斤/亩(以下凡只写施肥量或x者均指每亩硫铵用量).分期施用方法包括一次作基肥(中层肥,下同)、基
After the mid and late 1970s in Suzhou area, the problems of large amount of nitrogen fertilizer, small yield increase effect and low economic benefit have become increasingly prominent.For several major types of soil in the past two years, the rational application of nitrogen and nitrogen fertilizers in rice and wheat has been studied more. The results of the previous crop of rice in the previous year were reported in I. (This issue, Issue 2, 1981) This article is a review of the results of the experiment in the past two years.First, the test method and the repeated design of three plots in the field were conducted according to uniform design. Ammonium 40 ~ 100 pounds / mu (hereinafter only write the amount of fertilizer or x refers to the amount of ammonium sulfate per mu.) Stages of application methods include a base fertilizer (intermediate fertilizer, the same below), base