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1980年起,我们在苏南开展了灭茬免耕法(前茬收获后灭茬碎土深5厘米左右)应用效果的研究.三年实践结果初步说明,在多熟制下应用免耕法,对水稻土有防渍促爽、培肥土壤、利于稻麦增产的功效.研究工作主要在平田地区本所黄泥土上两个大区及有关试验田内进行.1980年设稻稻麦三熟制定位试验,有常耕(种稻干耕水旋,种麦旋耕后整细)、常免等处理.1981年设稻稻麦和稻麦两年五熟制定位试验,有常耕及少耕(两年内耕翻一次、前四熟稻麦免耕栽培,第五熟麦常耕栽培)两个处理.各试验田前作均系大元麦,土壤含粘粒(<0.001毫米)25%,有机质2.7%左右,微酸性.同时在所外也设了一些对比田.现就主要结果论述如下.
Since 1980, we conducted a study on the application effect of stubble tillage and no tillage (about 5 centimeters deep after stubble stubble harvesting before harvest) in the southern part of Jiangsu Province. The paddy soil has the functions of preventing soil from stains, promoting soil fertility and improving the yield of rice and wheat. The research work is mainly carried out in two large areas and in the related experimental fields on this soil in Pingtien Prefecture. In 1980, Experiments, there is a permanent cultivation (dry paddy rotation of water, wheat and wheat rotation after the fine), often exempt treatment, etc. In 1981 set rice and wheat and rice wheat two year five-year system positioning test, with tillage and tillage (Tilled twice in two years, no rice tillage in the first four years of rice cultivation, and fifth cooked tillage) .All the experimental plants were all Dashun Mai, with 25% clay (<0.001mm), organic matter 2.7% or so, slightly acidic, while at the same time also set up some contrast field. The main results are discussed below.