Improved Cultivars and the Application of Combined Fertilizer Improve the Grain Yield and the Nitrogen Uptake and Utilization in Continuously Cropped Soybean (<i>Glycine max</i> (L.) Merr.).

Both LAI and Pn in all growth stages exhibited an increasing trend in the order of CR > CF > DAP > CC ( Figure 1 and Figure 2 ). 2.2.

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Continuous soybean cropping can reduce the leaf photosynthetic rate and grain yield, with both showing a decreasing trend as the duration of continuous cropping increases.

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