Soil nutrients and enzyme activities based on millet continuous cropping obstacles.

Effect of crop succession on soil enzyme activity Soil urease activity in millets of different cropping years and rotations showed a trend of increasing and then decreasing with the fertility period (Fig. 3 ), the urease activity of the CK treatment continued to increase up to the filling stage, while that of the continuous cropping treatments began to decrease after the flowering stage.

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The results showed that with the increase of continuous cropping years, the millet yield decreased and was significantly lower than that of rotating with legume crops, and compared with CK, the yields of T1, T2 and T3 treatments were reduced by 8.92%, 13.73% and 37.60%, respectively; the soil nitrogen and phosphorus contents were reduced, the quick-acting potassium content did not change obviously, and the soil pH was increased; Soil urease, alkaline phosphatase, sucrase and catalase activities generally showed a decreasing trend and the decrease was more significant with the increase in the number of years of continuous cropping.

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