稻田水旱两熟及新三熟小麦轮、连作效应分析——“成都平原稻田水旱两熟及新三熟定位试验”第一报

ANALYSIS OF EFFECT FOR ROTATION AND CONTINUOUS CULTIVATION WHEAT IN PADDY-UPLAND DOUBLE CROPPING AND NEO-THREE CROPPING SYSTEM IN RICE FIELD

五年定位试验表明,水旱两熟稻田麦稻连作使土壤物理性状恶化,供肥能力降低,杂草大量增加,导致小麦显著减产.稻田新三熟具有显著减轻小麦连作障碍的作用.有利于改善土壤物理性状,提高土壤肥力和小麦对土壤养分的吸收利用能力,是提高两熟制小麦产量和克服连作小麦减产、提高资源利用率和社会、经济效益的有效途径.

By a location test in Chengdu Plain for 5 years, it was proved that the continuous cropping wheat in paddy-upland double cropping system worsened the soil Physical behaviour, reduced the ability of supplying fertilizer and aggravated weed growth so that the yield of wheat was declined no tablly. The neo-three cropping system, of paddy has the remarkable function lightened the barrier coused by continuous cultivating wheat. Which could better the soil physical structure, improve the soil fertility and the absorbing and using fertilizer capacity of wheat. It is a avaiable way to raise the yield and to surmount the continuous copping barrier of wheat thus it also could raise the resourel use efficiency and the social and economic benefit.