Long-term organic fertilizer combined with chemical fertilizer could increase crop yields [ 2 , 10 , 24 ], which was consistent with the results obtained in this study; the yields of wheat, maize, and soybean under treatments of organic fertilizer combined with chemical fertilizer showed an increasing trend.
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Response of Crop Yield and Productivity Contribution Rate to Long-Term Different Fertilization in Northeast of China.
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The sentences
The coefficient of variation ( CV ) of yield stability showed an overall trend of increasing first and then decreasing, with individual treatments showing a gradual increasing trend (NP and NPK; MNP and MNPK).
The soil productivity contribution rates of MNP and MNK showed a decreasing trend but still remained at a high level (97.2% and 95.9%). 3.4.