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近五年来,我们在喀左县老爷庙乡下河套村进行了磷肥大剂量投放与循环再利用试验,这里耕作土壤的有效磷(P_2O_5)含量为5ppm,正好同全县平均水平相当。试验表明,在大田作物上进行磷肥大剂量施用(每公顷P_2O_5210公斤)后,第一、二年可较不施磷的增产45％以上,比小剂量施用(每公顷施P_2O_535公斤)增产20％以上。在五年时间内,大剂量施用增产幅度从第三年开始呈下降趋势,而小剂量施用则逐年上升,五年总平均,二者增产水平趋于一致。试验结果表明,在贫磷地区施用磷肥具有极明显的增产效果;大剂量施用后可以获得很高的生物量,不仅籽实产量高,秸秆的产量亦遂之增加,对于通过饲养业来增加耕土壤的有机投入提供了极为有利的条件;大剂量投放与小剂量连年施用累计数量相同的情况下,其
In the past five years, we conducted a large dose of phosphate fertilizer and recycling experiment in Hetao Village, Laoyemiao Township, Qazuo County, where the content of available phosphorus (P 2 O 5) in cultivated soils was 5ppm, exactly the same as the county average. The results showed that the yield increase of more than 45% in the first year and the second year after phosphorus fertilizer application on field crops (P_2O_525 kg per hectare) increased by 20% compared with the low dose application (P_2O_535 kg per hectare) the above. Within five years, the rate of increase in high-dose application began to decline from the third year, while the increase in the low-dose application increased year by year. The average of the five years was about the same. The results showed that the application of phosphate fertilizer in areas with poor phosphorus had obvious yield increase effect. High-yield biomass could be obtained after high-dose application. Not only the high yield of seed and the increase of straw yield, Of the organic inputs provided extremely favorable conditions; high-dose delivery and the cumulative number of doses administered year after year the same case, its