Effects of Different Nitrogen Fertilizer Rates on Spring Maize Yield and Soil Nitrogen Balance Under Straw Returning Conditions of Cold Regions.

The results indicated that the accumulation of mineral nitrogen in the soil showed an increasing trend at harvest with the increase in the nitrogen application rate ( Figure 4 ).

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There was a highly significant linear positive correlation between the nitrogen surplus rate and the nitrogen application rate ( Figure 7 ), a negative correlation with the nitrogen fertilizer utilization rate ( Figure 8 ), and a highly significant quadratic curve relationship with nitrogen loss ( Figure 9 ).

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