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_2^--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_2^--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。
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.
出处
《中国生态农业学报》
CAS
CSCD
2001年第2期82-84,共3页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金重大(49890330)
关键词
苜蓿
硝态氮
铵态氮
矿化势
土壤氮素营养
土壤成分
Long-term fertilization, Medicago saliva Linn. , Nitrate-N, Ammonium-N, Mineral Potential
