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日本近20年来,普遍注意稻田的水旱轮作,已进行的试验表明:(一)水田转为旱地时,必须按旱作物出要求,彻底排水,实行完善的旱地化;过湿的田,水旱轮作不会成功。(二)水旱轮作的旱作物产量,因土壤不同而有差别。在土壤粘重、干燥硬结的田,旱作产量多比普通的旱地的低,特别在水田转为旱作的第一年,产量显著的低。与此相反,在砂质土壤的田,从第一年起旱作物的生育、产量便都很好,多胜过普通旱地。同时,不同的旱
Japan has generally paid attention to the rotation of paddy fields in the past 20 years. The tests carried out have shown that: (1) When paddy fields are converted to dry land, they must be drained completely and dried up in accordance with the demands of dry crops; well-drained fields, Flood and drought rotation will not be successful. (B) crop rotation and drought in crop production, due to different soil there are differences. In fields where the soil is sticky and dry, the output of dry cultivation is much lower than that of the average dry land, especially in the first year of paddy field conversion to dry cultivation, with significantly lower yields. On the contrary, in the sandy soil fields, the growth of dry crops from the first year was good and the output was even better than the ordinary dry land. At the same time, different drought