Soil N-supplying capacity is an important parameter to determine the nitrogen application rate.Based on the results from pot experiments treated with leaching soil initial nitrate and native soil,we compared the 8 chemical methods which reflecting soil nitrogen supplying capacity and nitrogen uptake by wheat and maize.25 different types of calcareous soils with big differentia collected from in ploughing layer in the Loess Plateau were used as tested soils.Among the 8 chemical methods,the H2SO4-KMnO4 method...
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