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七十年代中期以后,本地区大面积推广棉花与玉米间作制,对提高皮棉总产起了一定的作用,但仍不能改变棉花晚发、迟热、低产的面貌。而且出现了一些新的矛盾,主要表现在土壤肥力下降,病虫害蔓延,农本上升以及由于扩面带来农业生态系统与经济系统某些环节上的障碍。为研究改革该棉区种植制度,1982—1985年,在大丰县工作基点,以改革棉花栽培方式,提高粮棉单产为重点,进行了不同轮作方式的定位试验。通过系统研究,建立了二年棉一年粮轮作制,即夏熟作物实行大麦与蚕豆轮作,秋熟作物实行棉花与玉米间作黄、赤豆轮作,三年为一个周期。与原有的玉米棉花间作连作制相比,这一轮作制度能明显提高粮棉产量与农田经济效益。 试验方法 轮作处理四个,以粮棉间作处理(处理Ⅴ)为对照,共五个处理,其换茬方式列于表1。试验在三个试点同时进行,采取大区比较法,顺序排列,不
Since the mid-1970s, large-scale popularization of cotton and corn in the region has played a certain role in increasing the lint yield, but it still can not change the appearance of late, late-hot and low-yield cotton. And some new contradictions emerged, mainly manifested in the decline of soil fertility, the spread of pests and diseases, the rise of agricultural capital and the obstacles in some aspects of agro-ecosystem and economic system caused by the expansion of the expansion. In order to study the reform of cotton planting system in this area, from 1982 to 1985, in Dafeng County, the key points of work were to reform the methods of cotton cultivation and improve the yield of grain and cotton. Through systematic research, a two-year cotton grain-crop rotation system was established, that is, barley and broad bean rotation were carried out on summer ripe crops, and yellow and red bean crop rotation between cotton and corn was carried out on autumn ripened crops, with a cycle of three years. Compared with the existing intercropping system for corn and cotton, this rotation system can significantly increase grain yield and farmland economic benefits. Test methods for crop rotation four, grain and cotton intercropping treatment (treatment Ⅴ) as a control, a total of five treatments, the cropping methods are shown in Table 1. The experiment was conducted at the same time in three pilots, adopting the district comparative method, arranged in order, not