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我区自1964年普遍推广紫云英(红花草)起,1974年全区播种面积达247.24万亩,而后紫云英播种面积逐年缩小,到1985年只有69.04万亩,鲜草产量也下降。因此,使全区大面积耕地土壤有机质含量下降、土层变薄、耕性差、生产成本增加。紫云英播种面积和鲜草产量大幅度的下降原因是多方面的,但栽培管理技术是主要的。本文根据我所试验和调查,并结合外地经验分析影响紫云英鲜草产量的几个主要因素,供参考。
Since 1964, the district popularized Ziyunying (safflower) grass. Since 1974, the sown area in the whole region reached 2,472,400 mu. After that, the sown area of Ziyunying shrank gradually year by year. By 1985, there were only 690,400 mu and fresh grass production also dropped. Therefore, the area of arable land on a large area of organic matter content decreased, soil thinning, poor farming, production costs increase. There are many reasons for the sharp decline of the sown area and yield of freshwater mussel, but cultivation and management techniques are the main reasons. This article based on my tests and surveys, combined with field experience to analyze the impact of milk vetch fresh grass yield several major factors for reference.