数字农科院2.0

Effects of soil textures on N mineralization, uptake and utilization in paddy rice

文献类型： 外文期刊

作者： Ye, Chang;Tao, Yi;Xiao, Deshun;Xu, Yanan;Xu, Chunmei;Liu, Yuanhui;Yu, Kai;Wang, Danying

作者机构：

关键词： Paddy soil;Soil texture;Soil nitrogen mineralization;Nitrogen uptake and utilization

期刊名称： FIELD CROPS RESEARCH

ISSN： 0378-4290

年卷期： 2025 年 338 卷

页码：

收录情况： SCIE（2025版）

摘要： Context: Soil texture is a pivotal factor influencing soil structure and nutrient cycling. Nevertheless, the disparities in nitrogen (N) supply capacity among paddy soils with varying textures and their impacts on rice N uptake remain poorly understood. Objective: This study aimed to compare N mineralization parameters across paddy soils with varying textures, and explore their effects on the plant N uptake and utilization, thereby providing a theoretical foundation for implementing scientific fertilization practices based on soil type. Methods: This study employed a flooded incubation experiment to investigate soil N mineralization parameters across three soil textures: loam (L), silty loam (SL), and silty clay loam (SCL). Using two rice varieties (YY1540 and YD6) with different N uptake capacities as materials, field and pot experiments were conducted across the three distinct soil textures under two N rates (a no-N control and an N treatment) to analyze the influence of soil texture on N mineralization and plant N uptake. Additionally, the study employed the 15N tracer method to track the fate of fertilizer-N in both rice plants and soil. Key parameters were measured, including soil N mineralization parameters, plant N accumulation, grain yield, Calculations were performed for N use efficiency,15N recovery efficiency, and 15 N residue percentage in the soil after rice harvest. Results: The results showed that the soil N supply capacity in the CK was highest in silt clay loam (SCL), followed by silty loam (SL), and the lowest in loam (L). However, upon fertilizer-N application, the net N mineralization rate of L was significantly increased, with its N supply capacity exceeding that of SL. Correlation analysis showed that in the CK, soil N mineralization was influenced by soil carbon (C) and nitrogen (N) contents as well as soil texture, whereas soil texture emerged as the predominant factor after the application of fertilizer-N. Both rice varieties YY1540 and YD6 exhibited the highest yield, dry matter accumulation, and N accumulation in SCL soil, regardless of fertilization. Nevertheless, the response to N fertilization varied among soil types, with L showing the highest increase ratio in grain yield and total N recovery efficiency (NRE), followed by SL and SCL. Conversely, the 15N fertilizer recovery efficiency (15NRE) demonstrated an opposite trend, increasing from L to SL to SCL. The field experiment revealed that YY1540, characterized by strong N uptake capacity, displayed greater sensitivity to soil texture variations compared to YD6, which had a weaker N uptake capacity. The N accumulation of YY1540 was significantly correlated with the soil N mineralization rate constant k, while the correlation was not significant for YD6. Conclusions: These findings underscore the crucial role of soil texture in N mineralization processes and subsequent plant uptake, and highlight the importance of integrating rice variety, soil texture, and soil fertility when formulating fertilization strategies to optimize rice yield and fertilizer use efficiency.

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