Effect of cotton residues incorporation on soil properties, organic nitrogen fractions, and nitrogen-mineralizing enzyme activity under long-term continuous cotton cropping.

The activities of the two enzymes all showed a decreasing trend with the increase in continuous cropping duration in the absence of cotton residues incorporation.

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2 and 3 , the protease and urease showed an increasing trend with the increase in cropping duration under the cotton residues incorporation treatment, with values of 18.6 μg g −1 and 550.3 μg g −1 , respectively, for 20 years of continuous cropping.

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