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淡灰钙土是宁夏重点开发利用的耕地资源。针对新垦淡灰钙土土壤养分含量十分贫乏的问题,采取田间定位试验的方法,研究了新垦淡灰钙土4年不同施肥处理的增产培肥效应,结果表明:单施氮肥、有机肥和氮磷、氮磷锌及氮磷有机肥配施均有显著的增产作用。其中,施N225kg hm-2,较不施肥(对照)平均增产46.9%;施P2O5103.5~207.0kg hm-2,较单施氮肥平均增产31.3%,土壤速效磷提高1~2倍;每公顷第1年增施硫酸锌45kg hm-2的较氮磷配施平均增产7.7%,土壤有效Zn含量连续4年较氮磷配施提高1~1.5倍;增施羊粪11250~22500 kg的较氮磷配施平均增产14.1%,同时,土壤有机质含量较单施化肥提高30%左右。
Light gray earth is the focus of development and utilization of cultivated land resources in Ningxia. In order to solve the problem of poor nutrient content in the newly reclaimed light-calcareous soil, field experiment was conducted to study the effect of fertilization on the yield of the newly reclaimed light-calcareous soil after 4 years of different fertilization treatments. The results showed that single fertilization of nitrogen and organic fertilizers And nitrogen and phosphorus, nitrogen, phosphorus and zinc and nitrogen and phosphorus organic fertilizer with significant increase in production. Among them, application of N2525 hm-2 increased 46.9% on average compared with non-fertilization (control); P2O5103.5 ~ 207.0 kg hm-2 increased 31.3% on average, and soil available phosphorus increased 1-2 times; In the first year, the application of 45 kg hm-2 increased the average yield of nitrogen and phosphorus by 7.7% compared with that of nitrogen and phosphorus, and the effective Zn content of soil increased 1 ~ 1.5 times as much as that of nitrogen and phosphorus application for 4 years. The average yield of nitrogen and phosphorus fertilizers increased by 14.1%. Meanwhile, the content of soil organic matter increased by 30% compared with that of single application of fertilizers.