Liming reduces nitrogen uptake from chemical fertilizer but increases that from straw in a double rice cropping system
文献类型: 外文期刊
第一作者: Liao, Ping
作者: Liao, Ping;Liao, Ping;van Groenigen, Kees Jan;Liu, Lei;Sun, Yanni;Huang, Shan;Zeng, Yongjun;Chen, Jin;Chen, Jin
作者机构:
关键词: Yield; N recovery rate; N losses; Soil acidification; 15 N tracing
期刊名称:SOIL & TILLAGE RESEARCH ( 影响因子:6.5; 五年影响因子:7.3 )
ISSN: 0167-1987
年卷期: 2024 年 235 卷
页码:
收录情况: SCI
摘要: Liming materials are widely applied to alleviate soil acidification and increase rice yield in acidic soils, but their effects on nitrogen (N) use efficiency are still unclear. Here, we conducted a field-, pot-, and micro-plot exper-iment to investigate how the application of slaked lime (i.e., Ca(OH)2) affects the fate of chemical fertilizer-N and straw-N in a double rice cropping system. In the field experiment, liming increased grain yield and N uptake by an average of 9.0% and 10.6%, respectively. In contrast, CaCl2 application did not affect rice yield and N uptake, suggesting that the effects of lime application were not related to the addition of Ca2+. Results from a 15N tracer experiment (i.e., 15N-labeled urea and straw) indicated that liming reduced N uptake from fertilizer (-5.7%), but increased N uptake from straw (+31.3%). Liming also reduced soil retention of both urea-and straw-N and increased their loss rates. Taken together, our results indicate that although liming increases rice yield and N uptake, it lowers the use efficiency of fertilizer N and facilitates N losses. In addition, our results emphasize the need for long-term studies on the impact of liming on soil N dynamics in paddy soils.
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