3 Discussion With the increase in nitrogen application, the yield, dry matter accumulation, and nitrogen accumulation of maize showed a trend of first increasing and then stabilizing, and the high-efficiency varieties were significantly higher than the nitrogen-inefficient varieties [ 17 ].
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On correlation between canopy vegetation and growth indexes of maize varieties with different nitrogen efficiencies.
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The sentences
In addition to the maturity period, the coefficient of variation between varieties was largest under the condition of N0 and then showed a decreasing trend and finally an upward trend.
The correlations of dry matter quality, leaf nitrogen content, yield, and vegetation indices (NDVI, GNDVI, RVI, and GOSAVI) at the filling stage of different N-efficient maize varieties were all highly significant and positive.