Ammonia toxicity in aerobic rice: use of soil properties to predict ammonia volatilization following urea application and the adverse effects on germination

文献类型： 外文期刊

第一作者： Haden, V. R.

作者： Haden, V. R.;Hobbs, P.;Duxbury, J. M.;Xiang, J.;Peng, S.;Ketterings, Q. M.

作者机构：

关键词： urea: 57-13-6;ammonia: 7664-41-7;toxin;phytotoxin;soil property;soil texture;seed germination;clay content;ammonia volatilization;pH factor;germination adverse effect

期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.949； 五年影响因子：4.626 ）

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收录情况： SCI

摘要： Recent studies indicate that aerobic rice can suffer injury from ammonia toxicity when urea is applied at seeding. Urea application rate and soil properties influence the accumulation of ammonia in the vicinity of recently sown seeds and hence influence the risk of ammonia toxicity. The objectives of this study were to (i) evaluate the effects of urea rate on ammonia volatilization and subsequent seed germination for a range of soils, (ii) establish a critical level for ammonia toxicity in germinating rice seeds and (iii) assess how variation in soil properties influences ammonia accumulation. Volatilized ammonia and seed germination were measured in two micro-diffusion incubations using 15 soils to which urea was applied at five rates (0, 0.25, 0.5, 0.75 and 1.0 g N kg(-1) soil). Progressively larger urea rates increased volatilization, decreased germination and indicated a critical level for ammonia toxicity of approximately 7 mg N kg(-1). Stepwise regression of the first three principal components indicated that the initial pH and soil texture components influenced ammonia volatilization when no N was added. At the intermediate N rate all three components (initial pH, soil texture and pH buffering) affected ammonia volatilization. At the largest N rate, ammonia volatilization was driven by soil texture and pH buffering while the role of initial pH was insignificant. For soils with an initial pH > 6.0 the risk of excessive volatilization increased dramatically when clay content was < 150 mg kg(-1), cation exchange capacity (CEC) was < 10 cmol(c) kg(-1) and the buffer capacity (BC) was <2.5 cmolc kg(-1) pH(-1). These findings suggest that initial pH, CEC, soil texture and BC should all be used to assess the site-specific risks of urea-induced ammonia toxicity in aerobic rice.

分类号： S15

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