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连年在同一块田作留种田连年在同一块田作苕子留种田,种子产量逐年降低。百色农业试验站有一块田,从1959年到1961年,一连三年作苕子留种田,第一年每亩收种61斤,第二年收种42斤,第三年收种37斤,产量一年比一年低。为什么种子产量逐年降低呢?据观察,主要有以下几个原因:(一)连年在同一块
Year after year in the same Tianzuo stay farming year after year in the same field Tianzi stay farming, seed production decreased year by year. Baise Agricultural Experimental Station has a field, from 1959 to 1961, for three consecutive years as a raccoon stay farming, the first year received 61 pounds per mu, 42 kg the next year, received 37 pounds in the third year, Production is lower than a year. Why seed yield decreased year by year? According to observation, mainly for the following reasons: (a) year after year in the same piece