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近几年,有些地区和农户出现粮食减产或产量虽增但成本提高,经济效益降低的问题,究其原因主要是:①土壤耕作层变浅,土地承包后,由于土地面积较小,给机耕带来一定的困难,致使农民多以人力或畜力耕地,造成土壤耕作层变浅,熟化程度降低,保墒能力变差,作物生长条件受到限制,同时杂草丛生,虫害严重。据调查,仅以上因素就使小麦减产15％以上。②没有采用科学的种植方法和管理手段,如农民种水稻仍采
In recent years, in some areas and in some areas, the problems of grain output reduction or output increase but cost increase and economic efficiency decrease are mainly due to the following reasons: ① When the soil tillage layer becomes shallow and the land is contracted, since the land area is small, Resulting in some difficulties. As a result, peasants often cultivated land by manpower or animal husbandry, resulting in shallowing of soil cultivation layer, lowering of ripening degree, deteriorating of soil moisture conservation, limitation of crop growth conditions, overgrown of weeds and severe insect pests. According to the survey, more than 15% reduction of wheat output is only caused by the above factors. ② There is no scientific method of cultivation and management tools, such as farmers are still mining rice