摘要
麦秸还田与水旋耕结合能产生互补效应.因水旋耕解决了麦秸还田的作业困难,省工、掩草质量好;而加入麦秸后可避免水旋对土壤结构的破坏,并对土壤及作物产生有利影响.麦秸还田后第1个月内Eh降低,但降低的程度尚不致于对秧苗造成危害,1个月后Eh反比无麦秸处理高,有利水稻中后期生长.当前水稻基肥施氮量足以供应麦秸分解及秧苗生长之需,不会出现争氮现象.
It was considered in many reseach works in the last decade that rotatory tillage in water-logged paddy fields would seriously destroy soil structure, and the application of organic manure to paddy soil would produce a large amount of reduced substances which might adversely affect soil and seedlings. In order to try the easy and labour-saving technique of rotatory tillage in water covered paddy fields combined with returning wheat straw to soil,field and pot experiments were carried out. It was found that the effect of the above tillage combined with wheat straw was quite different from that without wheat
straw return. The former did not destroy soil structure, but improved many physical properties of the soil as well as the yield of rice instead. Practically, in rice production, wheat straw returned to paddy soil amounts only to several thousand kilograms per ha, far less than that used in pot experiments as re-lated in many literatures,and cannot go so far as to create an environment of strong reduction. Besides, wheat straw in waterlogged soil decomposes rather slowly and causes less intensity of reduction than pigsty manure and green manure do. Even though the Eh of the paddy soil within a month after the Wending of wheat straw with the soil was lower than that in the treatment without wheat straw,it re-mained higher than 50 mv,and therefore would do no harm to the erop and to soil structure. After thir-ty days and until the harvest day, the Eh of the treatment with wheat straw return became, on the con-trary,higher than that in the treatment without it,and therefore was advantageous to crop growth and soil structure. Blending of wheat straw with the soil by rotatory tillage in water covered paddy field is, therefore, considered a reasonable practice on the whole.
出处
《江苏农业学报》
CSCD
1992年第2期19-24,共6页
Jiangsu Journal of Agricultural Sciences
关键词
水旋耕
麦秸还田
水稻
Rotatory tillage
Paddy field
Return of wheat straw to soil
