土壤矿质氮和可矿化氮对当季作物的贡献

Contribution of soil mineral nitrogen and soil mineralization nitrogen to seasonal crop

从土壤矿质氮-硝态氮和铵态氮、土壤可矿化氮3个指标研究了土壤剖面不同层次有效氮对作物吸氮的贡献。结果表明,不同指标反映土壤供氮能力状况不一。土壤硝态氮和土壤可矿化氮与作物吸氮有较好的相关关系,而土壤铵态氮与作物吸氮关系不密切。在深度120 cm之上的土层的土壤可矿化氮对作物吸氮有较大的贡献。在考虑土壤供氮能力时,建议应该考虑120 cm深层以上的土壤。

We study the contribution of soil mineral(NO3--N, NH4+-N)and Mineralization nitrogen(N0) to seasonal crop. The results show: different index has the vary corelation to nitrogen adsorption of crop and there are better relationship between soil NO3-N, N0 and assimilat nitrogen of crop; but no better relationship to soil ammonium. The N0 of upper 120 cm soil had the great works to the nitrogen assimilation of crop, so we should take into account the NO of upper 120 cm soil as we evaluate the soil N-supply.