一.引言大规模的农业生产必须实施草田耕作制(或称草田农作制),在苏联的国营农场、集体农庄已成为既定的法则,因为他们若干年来的先进经验告诉我们,只有混合播种多年生牧草和农作物周期性的输作,是改良土壤结构,稳定并提高农作物产量及巩固饲料基地大量发展畜牧业的根本办法。多年生牧草种类很多,主要的牧草均隶属于禾本科和豆科。因这两科中的牧草混播后,在两三年内,就能 I. INTRODUCTION Large-scale agricultural production must implement grassland farming (or grassland farming). In the Soviet state-owned farms, collective farms have become established rules because of their years of advanced experience telling us that only mixed-crop perennials The cyclical transmission of forages and crops is a fundamental solution to improve soil structure, stabilize and increase crop yields and consolidate livestock production in large scale in fodder bases. Many types of perennial grass, the main forage are under the grass and legumes. Because of the mixed pasture in these two families, we can do it in two to three years