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《Agricultural Research in the Arid Areas》 1993-S1
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Studies on Methods Determing Soil Nitrogen—supplying Capacities Ⅰ. The Effectiveness of Different Biological Indeces in Reflecting Soil Nitrogen-supplying Capacities

Hu Tiantian;Li Shengxiu Northwestern Agricultural University, Yangling, Shaanxi 712100  
Field experiments show that the amounts of plant uptake nitrogen. is the most sensitive andstable biological index in reflecting soil nitrogen-supplying capacities and the objective creteria forevaluating the methods determing available nitrogen. Yields, dry matter, percentages of the yieldswith no N fertilization over the yields with N addition, yield increase percentages and yield in-crease amounts by N fertilization, are not so perfectus nitrogen uptake by plants,the correlationsbetween these indeces and initial soil NO_3~- -N being decreased by the mentioned order. Also, theamounts of plant uptake nitrogen from the treatment with P fertilization are more reliable for judging determined results by different methods.
【Fund】: 陕西省农牧厅资助项目
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