长期种植苜蓿对土壤氮素营养的作用
Effects of longterm plant Medicago sativa Linn. on soil nitrogen nutrient
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摘要: 13年长期施肥和轮作试验结果表明，连续种植苜蓿时N肥、P肥、有机肥的配合施用(NPM)较单施P肥对提高土壤硝态氮(NO-3-N)含量水平有较好效果；而无论施肥与否，种植苜蓿对土壤深层NO-3-N均造成不同程度的亏缺。苜蓿(NPM)连作较小麦(NPM)连作土壤NO-3-N利用率高；种植苜蓿对土壤铵态氮(NH+4-N)分布影响与NO-3-N不同，深层土壤CK、NPM配施处理NH+4-N含量明显高于施P和裸地处理，不同作物种植系统中以苜蓿连作土壤剖面中NH+4-N含量最高。与其他轮作相比，苜蓿连作在提高土壤剖面供N能力方面有较好作用。Abstract: The results of 13 years long-term fertilization and rotation test show that the application of nitrogenous fertilizer, phosphorate fertilizer and organic fertilizer in combination(NPM) can enhance the content of nitrate-N more effectively than that of application of only phosphorate fertilizer. There is a deficiency of nitrate-N in deeper soil layer after a longer time of planting Medicago sativa Linn. and a higher utilization ratio of nitrate-N of planting Medicago sativa Linn. than that of winter wheat. Among all treatments, the ammonium-N of planted Medigao sativa Linn. is the highest than that of other crops, and also the ammounum of CK and NPM are higher than that of P and the bareness disposal. Compared to other rotation systems, Medicago sative Linn. has better effect than others on improving the level of organic-N mineral potential.
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Keywords:
- Long-term fertilization /
- Medicago sativa Linn. /
- Nitrate-N /
- Ammonium-N /
- Mineral Potential
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