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目前,建立轮作体系主要依据作物构成、前后作特性及其对土壤理化性质的影响,除病害外,在土壤微生物对作物茬口影响方面研究甚少。受政策需要和商品价格的推动,某些主栽的粮油作物和经济作物在轮作中比例较大,趋向连作。因此,研究连作与轮作的机理,已成为重要的理论和实践问题。在各作物轮、连作的不同条件下,土壤微生物的反应相当活跃,甚至成为连作障害的要因。为了进一步寻找连作障害因子,1983～1984年开展了土壤微生物的研究。一、土壤微生物的效应为了揭示土壤微生物对各作物生育的影响,进行了无菌土壤与有菌土壤盆栽效果试验。1983年,播种前采取玉米、大豆、向日葵、草木樨连作试验区中垄台,0～20cm 表层
At present, the establishment of crop rotation system is mainly based on crop composition, before and after make characteristics and its impact on soil physical and chemical properties, in addition to disease, little research on the impact of soil microorganisms on crop stubble. Driven by policy needs and commodity prices, some of the major grain-oil crops and cash crops are in a larger proportion in the rotation and tend to work in tandem. Therefore, studying the mechanism of continuous cropping and rotation has become an important theoretical and practical issue. Under different conditions of crop rotation and continuous cropping, the response of soil microorganisms is quite active and even becomes the cause of crop failure. In order to further find the contingency factors, soil microbial research was carried out from 1983 to 1984. First, the effect of soil microorganisms In order to reveal the impact of soil microorganisms on the crop growth, sterile soil and soil bacteria pot experiment. In 1983, prior to sowing corn, soybeans, sunflowers, plants and trees continuous cropping test in the ridge, 0 ~ 20cm surface layer