Effects of straw management and N levels on gross nitrogen transformations in fluvo-aquic soil of the North China Plain

Ren, Guocui; Zhang, Xianfeng; Zhang, Jinbo; Mu, Lan; Xin, Xiuli; Yun, Yiming; Zhu, Anning; Ge, Shuchun

doi:10.1016/j.scitotenv.2024.173652

Science of The Total Environment

2024

DOI: 10.1016/j.scitotenv.2024.173652

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Effects of straw management and N levels on gross nitrogen transformations in fluvo-aquic soil of the North China Plain

Guocui Ren,

Xianfeng Zhang,

Jinbo Zhang

et al.

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Assessment of Different Humate Ureas on Soil Mineral N Balanced Supply

Bai,

Xu,

Ren

et al. 2024

Agronomy

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Urea supplements, such as humic acids, could enhance fertilizer nitrogen use effectiveness. Melting is superior to mixing for humate urea application; however, the effects of diverse humate ureas from various coal sources on soil N supply remain unclear. This study compared the properties of two humic acids from different coal sources (HA1, weathered coal; HA2, lignite coal), and their impact on soil mineral N supply and the nitrate–ammonium ratio under flooded and 60% water-filled pore space (WFPS) over a 14-day incubation. Humate ureas stimulated soil mineral N accumulation and balanced the soil nitrate–ammonium ratio at 1:1; however, no significant difference existed between the two humate ureas under 60% WFPS. Humate urea enhanced soil ammonium nitrogen (NH4+-N) retention and delayed nitrate nitrogen (NH4−-N) release, leading to soil mineral N retention, especially in lignite humic acid urea (H2AU) treatments from lignite under flooding. Structural equation modeling (SEM) and linear regression revealed that humic acids elevated soil redox potential (Eh) and electrical conductivity (EC), stimulating soil N mineralization and adjusting the optimal nitrate–ammonium ratio. Humate urea improved soil mineral N supply compared to traditional urea treatments, and humic acids from lignite were more beneficial for crop cultivation from a mineral soil N supply perspective. These findings enhance our understanding of humate urea benefits and aid in optimizing humic acids application for N management.

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Assessment of Different Humate Ureas on Soil Mineral N Balanced Supply

Bai,

Xu,

Ren

et al. 2024

Agronomy

View full text Add to dashboard Cite

show abstract

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Effects of straw management and N levels on gross nitrogen transformations in fluvo-aquic soil of the North China Plain

Cited by 1 publication

References 53 publications

Assessment of Different Humate Ureas on Soil Mineral N Balanced Supply

Assessment of Different Humate Ureas on Soil Mineral N Balanced Supply

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