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Comparing combined application of biochar and nitrogen fertilizer in paddy and upland soils: Processes, enhancement strategies, and agricultural implications

文献类型：外文期刊

第一作者： Yuan, Xiaomai

作者： Yuan, Xiaomai;Liang, Run;Ban, Guichen;Ma, Li;Wang, Ziting;Yuan, Xiaomai;Liang, Run;Ban, Guichen;Ma, Li;Wang, Ziting;Yuan, Xiaomai;Liang, Run;Ban, Guichen;Ma, Li;Wang, Ziting;Gu, Xiaoyan;He, Tieguang

作者机构：

关键词： Biochar; N fertilizer; Paddy; Upland; N use efficiency

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （影响因子：8.0；五年影响因子：8.7 ）

ISSN： 0048-9697

年卷期： 2024 年 933 卷

页码：

收录情况： SCI

摘要： Recently, biochar and N fertilizers have been used to tackle low N use efficiency (NUE) in crops across diverse environmental conditions. The coupling of biochar and N fertilizer may impact crop N utilization through different pathways in various soil types. However, there is currently a lack of comprehensive assessment of how coupling effects specifically influence N utilization in paddy and upland crops. We conducted a meta-analysis of 175 peer-reviewed studies to assess the responses of soil properties and crop traits in paddy and upland fields under coupling effects. The results indicate that NUE (+26.1 +26.1 %) and N uptake (+15.0 +15.0 %) in paddy fields increase more than in upland fields (+23.7 +23.7 % and +8.0 %, respectively), with the coupling effect providing NH4+ predominantly for rice and NO3 for upland crops. NH4+ increases in paddy fields (+6.9 +6.9 %) but decreases in upland fields (-0.7 %), while microbial biomass carbon (MBC) decreases in paddy fields (-2.9 %) and increases in upland fields (+36.0 %). These findings suggest that coupling effects supply soil inorganic nutrients in paddies and affect microbes in uplands, thereby positively affecting crop N utilization. Specifically, the greatest increase in paddy crop yield and N use efficiency occurs when the ratio of N fertilizer to biochar exceeds 1.5 %, and in uplands, it manifests when applying 10-20 t center dot ha(-1) of biochar and <150 kg center dot ha(-1) N fertilizer. In conclusion, this meta-analysis explores the differential effects of biochar and N fertilizer coupling in different arable land types, offering novel insights into the utilization strategies of biochar in agricultural fields.

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