Optimizing nitrogen application rate and plant density for improving cotton yield and nitrogen use efficiency in the North China Plain.

Results Effects of PPD and NAR on yield and composition of cotton Effects of PPD on biological yield, economic (seedcotton, lint) yield and harvest index With the increase of PPD (under the same NAR), biological yield increased significantly, and number of bolls per m 2 , seedcotton yield and lint yield showed an increasing trend, while harvest index decreased significantly, and boll weight, pre-frost yield rate also showed a decreasing trend ( Table 3 ).

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