一、寒地水稻田秸秆还田必要性和可行性秸秆还田早在 60年代就提出开展 ,可在北方寒地稻田由于诸多原因至今难以实施。为提高水稻单产增加效益 ,开展稻田秸秆还田势在必行。目前水稻田施有机肥面积小、数量少 ,面积仅占 1 0 % ,每 667m2 施量几百公斤。其原因主要是有机肥源缺 First, the necessity and feasibility of returning straw to field in paddy fields in the cold region Straw was proposed as early as the 1960s and can not be implemented in the northern winter due to many reasons. In order to increase the yield of paddy rice, it is imperative to develop paddy field straw. At present, organic fertilizer applied in paddy fields has small area and small quantity, accounting for only 10% of the area, with several hundred kilograms per 667m2 applied. The main reason is the lack of organic fertilizer source