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1978年我社机械深松7,000多亩,比不进行深松的增产11~12%,并早熟2~3天.我们对八里庄一队进行了清种玉米深松效果调查。该地块5月7
In 1978, our company was submerged in more than 7,000 mu of machinery, 11-12% more than the non-submerged ones and 2-3 days prematurely. The lot is May 7