Productivity and sustainability of rainfed wheat-soybean system in the North China Plain: results from a long-term experiment and crop modelling.

Sci Rep · 2015 · PMC4667244 · PMID 26627707

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a slightly increasing trendno p-value reported

There was a slightly decreasing trend in soil available N in treatment T1 (NPK fertilizer alone) and a slightly increasing trend in SOC content ( Fig. 4 ) clearly indicating that the supply of N in this treatment was not excessive.

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