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在浙江省主要的四大农区的10个地点进行的不同类型稻田多熟制定位试验(1978-1984)结果表明:(1)在一定的耕作培肥条件下,稻田多熟制可获得较高的产量水平(每年每公顷15吨),同时土壤把力保持平衡;(2)在集约耕作培肥条件下,稻田土壤肥力还可得到相应培育;(3)在本试验条件下稻田土壤-作物系统养分平衡的总趋势是氮磷显著盈余而钾素接近缺亏;(4)稻田多熟制中冬作物营养主要依赖肥料,而水稻的养分则主要源于土壤,必须根据此项特性指导施肥;(5)在多熟制稻田中,即使短期不施有机肥也会导致土壤腐殖质活性下降。维持土壤有机碳平衡的有机物用量下限为每年每亩1,200公斤,而维持年亩产1,000公斤的有机物用量为每年每亩2.250公斤。
Different types of rice paddy location trials (1978-1984) conducted in 10 locations in four main agricultural areas of Zhejiang Province showed that: (1) (15 tons per hectare per year), meanwhile, the soil forces are balanced; (2) Soil fertility of paddy field can be cultivated under intensive cultivation and fertilization; (3) Under the test conditions, The general trend of nutrient balance in crop system is the significant surplus of nitrogen and phosphorus and the shortage of potassium close to deficit. (4) The nutrition of winter crop in multi-cropping system of paddy is mainly dependent on fertilizers, while the nutrient of rice is mainly derived from soils. Fertilization; (5) In multiple-cropping paddy fields, even short-term application of organic fertilizer will lead to the decline of soil humus activity. The minimum amount of organic matter used to maintain soil organic carbon balance is 1,200 kilograms per mu per year, while the annual amount of organic matter used per 1,000 kilograms per year is 2.250 kilograms per mu per mu.