It can be seen that the year, N application rate, N fertilizer management model, and their interactions have either a significant or extremely significant effect on the nutrient contents of the soil.
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Increasing the Contents of Paddy Soil Available Nutrients and Crop Yield via Optimization of Nitrogen Management in a Wheat-Rice Rotation System.
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The sentences
Soil urease activity showed a decreasing trend as growth progressed, with the highest levels of soil urease content in the soil at the jointing, heading, and mature stages of rice in 2019.