Effects of Nitrogen Fertilization on Crop Yields and Soil Nitrogen Balance in Potato-Wheat System
In order to define characteristics of crop yields in potato-wheat rotation and soil nitrogen balance,a longterm experiment was done at Zhong Banner Base in Inner Mongolia Potato Breeding Center.Four nitrogen fertilization treatments (N0:no N fertilizer used,ON1:2/3 N fertilizer reduced,ON2:1/3 N fertilizer reduced and FN-farmer habit N application rate) were designed.The results showed that compared with the FN treatment of the farmers,the yield under the reduced nitrogen 1/3 treatment (ON2) did not decrease but increased.At the same time,the nitrogen absorption accumulation under the ON2 treatment of nitrogen reduction was higher than that of FN,and the production efficiency of nitrogen fertilizer was higher than that of FN.Under the reducing nitrogen treatments (ON1,ON2),soil inorganic nitrogen residue in the top layer (0-30cm) of was significantly lower than that under FN,and the loss of nitrogen mainly happened in wheat planting season.This study implied that nitrogen 1/3 reduction could be used to realize stable crop production,improve the utilization rate of nitrogen at the same time,and reduce effectively the risk of nitrogen fertilizer pollution to the environment in the nitrogen excessive application potato-wheat system in Inner Mongolia.
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万方数据
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