土壤可矿化氮对作物吸氮量的贡献

The Contribution of Mineralizable Soil N to Crop N Uptake

在盆栽和田间条件下，研究了作物吸氮与土壤可矿化氮的关系。盆栽试验中，一季玉米吸氮占Ｎ０的百分数平均为２８．０±５．１％，小麦为１６．１±３．１％，一季玉米吸收的土壤可矿化氮平均为４．３±０．３ｋｇ／亩，小麦为３．７±１．３ｋｇ／亩。田间试验并未发现可矿化氮在土壤剖面中的累积，一季玉米吸收的土壤可矿化氮为４．３４ｋｇ／亩，小麦为７．

The relationship between mineralizable soil N and crop N uptake was studied under the condition of pot and field experoments respectively.In pot experiment,maize N uptake was 28.0±5.1% of N 0 while wheat N uptake was 16.1±3.1%;and maize mineralized N uptake was 4.3±0.3kg/mu on an average while wheat mineralized N uptake was 3.7±1.3kg/mu.In the field experiment,accumulative mineralized N was not observed in soil;maize mineralized N uptake was 4.34kg/mu while wheat minera lized N uptake was 7.19kg/mu.