Effects of Paddy Rain-Flood Storage on Rice Growth Physiological Indices and Nitrogen Leaching under Organic Planting in Erhai Lake Basin.

In 2022, the NH 4 + -N concentration showed an overall trend of C > CK, with the peak occurring 3 days after fertilization and reaching its lowest point at 7 days ( Figure 11 ab).

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In 2022, the root-to-shoot ratio in the C pattern was consistently higher than that in the CK pattern, exhibiting an increasing trend from the tillering stage to the jointing–booting stage, followed by a declining trend in the remaining periods.

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In 2023, the root-to-shoot ratio generally showed a decreasing trend, with higher values in CCD compared to CKCD, except during the jointing–booting stage where CKCD surpassed CCD.

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It is highly significant to protect water quality of Erhai Lake [ 4 , 5 ].

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The concentration of NH 4 + -N in groundwater in 2023 showed a trend of CCD > CKCD.

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