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本文以在潮土进行的 2 0年的长期肥料试验为例进行研究 .结果显示 ,单施化肥处理土壤有效硫出现耗竭趋势 ,而施用有机肥的处理则保持较高有效硫水平和由于所含钙磷肥和有机肥以及灌溉水中含有数量可观的钙 ,土壤水溶态钙和交换态钙含量除对照外 ,各处理间十分接近 ,各处理的钙均有赢余 ;由于有机肥对土壤镁素的补充作用 ,水溶态镁、交换态镁、酸溶态镁和全镁含量均表现为原始土 >单施有机肥 >对照 >化肥与有机肥配施 >单施化肥 ,即使在施用有机肥条件下 ,土壤镁素仍然亏缺
In this paper, 20 years of long-term fertilizers experiments conducted in alluvial soil were taken as an example to study the results show that the available sulfur fertilizer application soil organic sulfur depletion trend, while the application of organic fertilizer treatment is to maintain a higher effective sulfur level and due to contained Calcium phosphate and organic fertilizer and irrigation water contains a considerable amount of calcium, soil water-soluble calcium and exchangeable calcium content in addition to the control, the treatment is very close to each treatment of calcium have a surplus; due to organic fertilizer on the soil magnesium supplement Effect, water-soluble magnesium, exchangeable magnesium, acid-soluble magnesium and total magnesium content of the original soil> single application of organic fertilizer> control> chemical fertilizer and organic fertilizer> fertilizer alone, even in the application of organic fertilizer conditions, Magnesium is still deficient in the soil