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Organic Fertilizers as Partial Substitutes for Chemical Fertilizers Enhance Nitrogen Immobilization and Optimize Nitrogen Fate in Paddy Soils

文献类型： 外文期刊

作者： Hou, Hongqian 1 ; Ji, Jianhua 1 ; Lan, Xianjin 1 ; Drosos, Marios 5 ; Liu, Xiumei 1 ; Lv, Zhenzhen 1 ; Liu, Yiren 1 ; Cheng, Zhengxin 6 ; Zhou, Weijun 7 ;

作者机构： 1.Jiangxi Acad Agr Sci, Inst Soil & Fertilizer & Resources & Environm, Nanchang 330200, Peoples R China

2.Natl Engn & Technol Res Ctr Red Soil Improvement, Nanchang 330200, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Acidified Soil Ameliorat & Utilizat, Nanchang 330200, Peoples R China

4.Natl Agr Expt Stn Agr Environm, Yichun 336000, Peoples R China

5.Univ Basilicata, Dept Agr Food & Environm Sci DAFE, Viale Ateneo Lucano 10, I-85100 Potenza, Italy

6.Jiangxi Acad Agr Sci, Nanchang 330200, Peoples R China

7.Hunan Agr Univ, Coll Resources, Changsha 410128, Peoples R China

关键词： N-15 tracer techniques; organic N fractions; N immobilization; N fertilizer fate; paddy soil

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 12 期

页码：

收录情况： SCI

摘要： Organic fertilizers as partial substitutes for chemical fertilizers improve soil nitrogen (N) retention capacity. However, the relative importance of biotic and abiotic N immobilization at different levels of organic N substitution and the subsequent effects on N utilization in paddy soils are not well elucidated. To address these, a combination of N-15 incubation experiments and pot experiments were conducted to investigate biotic and abiotic N immobilization features and their effects on N fertilizer fate under long-term different fertilization regimes in paddy soils in China. Test soils that had received chemical fertilization (NPK), chemical N was substituted with 30%, 50%, and 70% organic N (70 F + 30 M, 50 F + 50 M, and 30 F + 70 M, respectively), and no fertilization (control) for 36 years. The results revealed that both abiotic and biotic NH4+-N immobilization were enhanced under organic N substitution soils. The highest NH4+-N abiotic and biotic N immobilization was observed under 50 F + 50 M soil, significantly increasing by 195.5% and 51.4%, respectively, compared to the NPK soil. In contrast, only abiotic NO3--N immobilization increased with rising organic substitution N proportions. N fertilizer utilization efficiency was significantly enhanced in 50 F + 50 M soil (36.7%) compared to the NPK soil (30.3%), which was primarily attributed to the enhanced N pool activity and N immobilization capacity. However, the N fertilizer residue rate was significantly higher in the 30 F + 70 M soil (23.6%) compared to the NPK soil (21.6%), largely attributed to the soil properties improvement. Our results suggest that N immobilization capacity and N fertilizer utilization can be optimized with a 50% organic substitution ratio in our studied soil-crop system.

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