Effect and economical benefit of controlled-release nitrogen fertilizer application on late rice in different basic fertility of paddy soils was studied.
探讨了不同肥力水平水稻土与水稻控释氮肥对晚稻的应用效应及经济效益。
Effect of plant density and fertilizer application on plantain yield in two soils from Colombia with different natural fertility is shown (Table 2).
表2说明了在哥伦比亚的两种不同天然肥力土壤上种植密度及肥料用量对大蕉产量的影响。
The results show that yield increase effect and economic benefit of controlled release N fertilizer application decrease in lower, medium and higher fertility paddy soils in proper order.
结果表明：在较低、中等和较高肥力稻田上，施用控释氮肥的增产效果和经济效益依次递减；
The effect of application of organic materials on improving the fertility of Chernozem was studied with two-year pot culture experiments.
通过两年的盆栽试验，研究了有机物料对黑钙土的培肥作用。
The effect of application of organic materials on improving the fertility of Chernozem was studied with two-year pot culture experiments.
通过两年的盆栽试验，研究了有机物料对黑钙土的培肥作用。
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