摘要
１９８７～１９９０年对免耕、少耕（浅旋耕）、常规耕的稻茬麦田杂草发生特点进行了研究。结果表明，３种耕法麦田杂草群落中，禾本科杂草（看麦娘、硬草）为优势种，群落中的杂草种类无变化，但免耕使田间杂草群落类型向有利于禾本科杂草的方向发展。３种耕法麦田杂草发生动态呈一致性，表现为冬前一个主出草高峰，次年春季一个次高峰。但免耕麦田杂草发生的时间早、数量多、出草主高峰明显，草量约为耕翻田的２倍，出草时间也比耕翻田早５～７ｄ，出草高峰相应提前。在３种耕法的麦田中，以０～５ｃｍ表土层可萌发杂草种子分布的比例为最高。免耕麦田的可萌发杂草种子集中分布在０～５ｃｍ的表土层中，少耕麦田可萌发杂草种子主要分布在０～５，５～１０ｃｍ的土层中，而常规耕麦田的可萌发杂草种子在耕作层中分布比例趋向接近。
This paper investigtes the occurrence of weeds in wheat fields with rice-wheat rotation underno-tillage,minimum tillage and conventional tillage,The results showed that the farming methods affectedweed communities significantly.Of the communities grass weeds increased while the broad leaf weeds de-creased in both the no-tillage field and the minimum tillage field.The density of weeds in the no-tillagefield was about twice as high as that in the conventional tillage field. Weed species were the same under the 3farming methods. The occurrence of weeds in the fields under 3 farming methods kept the same tendency.Amajor peak of weeds appeared after wheat sowing and a secondary-peak of weeds at the next Spring.But theoccurrence date was 5～7 days earlier in the no-tillage field than that in the normal tillage field .Weed seeds which could germinate distributed mainly in 0～5cm soil layer in the no-tillage field.
出处
《江苏农学院学报》
CSCD
1994年第3期19-22,共4页
Jiangsu Agricultural Research
基金
江苏省"七五"攻关
关键词
耕作制度
少耕
免耕
麦田
杂草
farming systems
minimal tillage
no-tillage/wheat field
weed
