The S4 also showed a decreasing trend followed by an increasing trend in the FBS (2021), PBS (2021) and BOS (2021) stages.
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Effect of different NPK fertilization timing sequences management on soil-petiole system nutrient uptake and fertilizer utilization efficiency of drip irrigation cotton.
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The sentences
The soil NH 4 + -N content of each treatment was highly significant at the FBS, FFS and PBS, and the difference between treatments decreased when the BOS was reached.
Under different NPK timing sequences management, the S1 and S3 showed a trend of increasing soil NO 3 – -N content with increasing the same soil depth.