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绥化县秦家公社东发大队从1974年开始进行垄沟深松试验,1975年全大队中耕作物90％以上面积进行了垄沟深松。为了摸清垄沟深松的适宜时间和次数,我们进
Suihua County Qin commune East brigade started from 1974 to conduct deep furrow test, in 1975 the entire brigade cultivate crops in more than 90% of the area for deep furrow. In order to find the appropriate time and number of deep furrows, we enter