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俗活说:“肥是农家宝,还要施得巧”。这个“巧”字就是指施肥要讲科学。科学施肥能增产,不讲科学增加了成本未必能增产。水稻一生要从田中吸收的三要素(以亩产500公斤计,下同)纯氮15.5公斤、五氧化二磷5公斤、氧化钾9公斤,其中随稻谷收获带上的有:纯氮10公斤,五氧化二磷3.5公斤、氧化钾6公斤,剩余部分以稻草及根还回土壤,若烧稻草则把氮、磷几乎全部烧尽,成为气体损失掉。因此,为了保持水稻稳产高产,人们主要靠施肥来补充 一、以土定产,以产定肥,推广全层
Folklore said: “Fat is a farm treasure, but also applied Qiao.” This “clever” word refers to fertilization to talk about science. Scientific fertilization can increase production, do not speak of science to increase costs may not be able to increase production. Three elements of paddy rice to absorb from the field (in 500 kg per mu, the same below) 15.5 kg of pure nitrogen, phosphorus pentafluoride 5 kg, potassium 9 kg, of which with rice harvest zone are: 10 kg of pure nitrogen , 3.5 kg of phosphorus pentoxide and 6 kg of potassium oxide. The rest is returned to the soil with straw and roots. If the straw is burned, almost all of nitrogen and phosphorus are burnt out and the gas is lost. Therefore, in order to maintain a stable and high yield of rice, people mainly rely on fertilization to supplement one, to soil production, to produce fertilizer, promote the full-scale