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对作物吸氮量直接贡献较大的起始NO~-_3—N,旱区位于30～60cm土层,灌区位于60～100cm土层。播种前0～60cm和0～100cm的起始NO~-_3—N分别是旱区和灌区土壤对冬小麦供氮的可靠指标。不仅如此,一定深度土壤的起始NO~-_3—N还决定了作物吸收氮素的多少。而各种方法测定的可矿化氮反映了土壤潜在的供氮水平。依据一定深度的起始NO~-_3—N划分的土壤氮肥力等级,与两地生产水平相一致。
The initial NO ~ -_3-N, which directly contributes to the nitrogen uptake of crops, is located in the soil layer of 30-60 cm in the arid area and the soil layer of 60-100 cm in the irrigation area. 0 ~ 60cm before sowing and 0 ~ 100cm starting NO ~ -_3-N were the reliable indicators of nitrogen supply to winter wheat in arid and irrigated area respectively. Not only that, a certain depth of the soil starting NO ~ -_3-N also determines how much the crop absorb nitrogen. The mineralizable N determined by various methods reflects the potential level of nitrogen supplied to the soil. According to a certain depth of initial NO ~ -_3-N division of soil nitrogen fertility level, consistent with the production levels of the two places.