Optimized application strategy of Nitrogen-Silicon (N-Si) fertilization improves nitrogen metabolism, grain yield, and growth of rice under dry cultivation.

Glutamate dehydrogenase activity increased with the increase in nitrogen fertilizer application during the tillering and full heading stages, displaying an increasing trend followed by a decrease during the grouting stage.

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In this experiment, the net Pn, Tr and Gs of rice under different nitrogen fertilizer treatments from the tillering stage to the filling heading stage showed a trend of increasing and then decreasing, and the Ci showed a trend of decreasing gradually.

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The results from two years indicated that the leaf area among treatments reached the maximum value at the full heading stage, followed by an increasing and a decreasing trend throughout the reproductive period.

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