论文部分内容阅读
通过1978～1987年连续九年定位试验,研究有机肥施用量对调节土壤磷素平衡的影响。结果表明,每年亩施舍磷5kg的有机肥,土壤速效磷含量比播前提高0.6ppm比对照平均增加9.2ppm。每年亩施含磷2.5kg的有机肥,土壤速效磷含量与播前没有差异,比对照增加3.5～4.1ppm。不施有机肥的处理土壤速磷平均每年降低1.2ppm,比对照降低0.8～1.3ppm。九年十七季作物携出磷与投入磷量相比较,对照、单施氮肥及每亩施含磷2.5kg有机肥的处理是亏损的,每年亩施含磷5.0kg有机肥的处理,每亩盈余4.8—11.6kg,并随配合氮肥施用量的增加而盈余量减少,亏量增加。
Through the nine years of continuous positioning experiment from 1978 to 1987, the effects of organic manure on the regulation of soil phosphorus balance were studied. The results showed that with the application of organic fertilizer of 5 kg mu per mu per year, the content of available phosphorus in soil increased by 0.6 ppm than the control by 9.2 ppm on average. Mushi 2.5kg of organic fertilizer per year, soil available phosphorus content and sowing no difference, 3.5 ~ 4.1ppm increase compared with the control. Treatment without organic fertilizer The average soil available phosphorus decreased by 1.2ppm per year, 0.8 ~ 1.3ppm lower than the control. In the seventeen seasons, the phosphorus carried by the crop was compared with that of the input phosphorous. In contrast, the treatment with single application of nitrogen fertilizer and 2.5kg of organic fertilizer containing phosphorus per mu was a loss. Each year, Mu surplus 4.8-11.6kg, and with the increase of the amount of nitrogen fertilizer, the surplus decreased and the deficit increased.