Long-acting mechanisms of concentrated urea application — High urea concentrations are biological inhibitors

Cheng, Liang; Chen, Xiaoqin; Lu, Dianjun; Wang, Huoyan

doi:10.1016/j.apsoil.2022.104723

Cited by 4 publications

(5 citation statements)

References 53 publications

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“…This finding was consistent with those of Deppe et al [48] and Merl et al [31]. This may be due to the toxic effects of high concentrations of ammonium nitrogen on soil nitrifying microorganisms [33] that inhibit the activity of ammonia-oxidizing microorganisms, thereby inhibiting nitrification [32]. The high NH 4…”

Section: Discussionsupporting

confidence: 90%

“…In previous studies, fertisphere microdomains have been investigated using in situ soil sectioning [30] and by applying an optical sensor system to laboratory microcosm chambers [31], but using those methods, it is difficult to obtain accurate sampling. In addition, fertisphere microdomains can be simulated using different nitrogen fertilizer concentrations [32,33]. In our field experiments, HAU showed a good yield-increase effect on crops planted in Fluvo-aquic soil.…”

Section: Introductionmentioning

confidence: 78%

“…Additionally, the soil pH dropped as one moved farther away from the fertilizer application core, as the ammonium nitrogen content in the soil was reduced. The decrease in soil ammonium nitrogen concentration could be due to nitrification and ammonia volatilization [32]; however, the nitrification of U and HAU was negligible during the incubation period when it was closer to the fertilizer application core. This finding was consistent with those of Deppe et al [48] and Merl et al [31].…”

Section: Discussionmentioning

confidence: 98%

“…), where nutrient concentrations are abnormally high, and there is a clear specificity in the nitrogen transformation of the fertilizer. The upper limit level was based on the works of Cheng et al [32] and Chen et al [33]; ammonium nitrogen content in the soil after band application or point injection of fertilizer can easily exceed 3000 mg kg −1 [35], and ammonium nitrogen contents of up to 2000 mg kg −1 have been measured in soil within the 8.5 cm radius [36]. The lower limit level was based on the normal usage in field applications.…”

Section: Experimental Designmentioning

confidence: 99%

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Characteristics of N Transformation of Humic Acid Urea in Different Circle Layers of the Fertisphere: A Simulated Experiment

Liu,

Xu,

Yuan

et al. 2024

Agronomy

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Due to its broad yield-increasing effect and low cost, humic acid urea (HAU) has become one of the leading modified fertilizers worldwide. The fertisphere is the primary space where urea (U) granules participate in the soil nitrogen cycle, forming a nutrient concentration gradient centered on the point of fertilization. The closer the circle layers to the urea granule in the fertisphere, the higher the nitrogen concentration. However, HAU in this microregion remains poorly understood. The differences in the transformation process from the inside to outside circle layers of the U and HAU fertispheres were simulated and studied using soil incubation experiments under 20, 10, 2, 1, and 0.2 g kg−1 nitrogen inputs. The 20 and 10 g kg−1 inputs represent the layers closest to the urea granule. Within the first seven days, HAU treatment showed higher concentrations of soil ammonia-N content than U treatment within the two layers closest to the fertilizer core, while exhibiting lower concentrations under the farthest two layers. Under 2 g kg−1 nitrogen input, the nitrate nitrogen under the HAU treatment was significantly higher than that in the U treatment, indicating a higher nitrification rate. During the 42-day incubation period, soil mineral nitrogen content under the HAU treatment was higher than that for the U treatment in the two closest circles. On the 42nd day, the residual urea-N under the HAU treatment was significantly higher than that for the U treatment when the nitrogen input was higher than 1 g kg−1. The effect of higher fertilizer preservation and supply capacity of HAU in Fluvo-aquic soil was achieved by changing the urease activity and nitrification rate in fertisphere ranges closer to the fertilizer core. An improved understanding of the high-efficiency mechanism of HAU in the fertisphere process will contribute to the development of new-generation high-efficiency urea products.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 98%

Section: Experimental Designmentioning

confidence: 99%

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Characteristics of N Transformation of Humic Acid Urea in Different Circle Layers of the Fertisphere: A Simulated Experiment

Liu,

Xu,

Yuan

et al. 2024

Agronomy

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“…Moreover, it allows the applied N fertilizer to be distributed in the active root zone, which then enhances root proliferation and promotes N uptake by the root system ( Jiang et al., 2019 ). Application of N in this method can prolong N retention and reduce potential loss by influencing ammonia-oxidizing archaea and bacteria ( Cheng et al., 2023 ). Studies conducted at field levels through this technique revealed promising results on yield, NUE, or gaseous emissions such as maize ( Jiang et al., 2018 , 2019 ; 2022 ), rice ( Lu et al., 2019 ; Song et al., 2022a ), wheat ( Chen et al., 2016 ; Song et al., 2022b ), and oilseed rape ( Brassica Napus L.) ( Cheng et al., 2022b ), against a conventional split and broadcasting methods.…”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

Global evaluation of key factors influencing nitrogen fertilization efficiency in wheat: a recent meta-analysis (2000-2022)

Yokamo,

Irfan,

Huan

et al. 2023

Front. Plant Sci.

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Improving nitrogen use efficiency (NUE) without compromising yield remains a crucial agroecological challenge in theory and practice. Some meta-analyses conducted in recent years investigated the impact of nitrogen (N) fertilizer on crop yield and gaseous emissions, but most are region-specific and focused on N sources and application methods. However, various factors affecting yield and N fertilizer efficiency in wheat crops on a global scale are not extensively studied, thus highlighting the need for a comprehensive meta-analysis. Using 109 peer-reviewed research studies (published between 2000 and 2022) from 156 experimental sites (covering 36.8, 38.6 and 24.6% of coarse, medium, and fine texture soils, respectively), we conducted a global meta-analysis to elucidate suitable N management practices and the key factors influencing N fertilization efficiency in wheat as a function of yield and recovery efficiency and also explained future perspectives for efficient N management in wheat crop. Overall, N fertilization had a significant impact on wheat yield. A curvilinear relationship was found between N rates and grain yield, whereas maximum yield improvement was illustrated at 150-300 kg N ha-1. In addition, N increased yield by 92.18% under direct soil incorporation, 87.55% under combined chemical and organic fertilizers application, and 72.86% under split application. Site-specific covariates (climatic conditions and soil properties) had a pronounced impact on N fertilization efficiency. A significantly higher yield response was observed in regions with MAP > 800 mm, and where MAT remained < 15 °C. Additionally, the highest yield response was observed with initial AN, AP and AK concentrations at < 20, < 10 and 100-150 mg kg-1, respectively, and yield response considerably declined with increasing these threshold values. Nevertheless, regression analysis revealed a declining trend in N recovery efficiency (REN) and the addition of N in already fertile soils may affect plant uptake and RE. Global REN in wheat remained at 49.78% and followed a negative trend with the further increase of N supply and improvement in soil properties. Finally, an advanced N management approach such as “root zone targeted fertilization” is suggested to reduce fertilizer application rate and save time and labor costs while achieving high yield and NUE.

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Humic acid urea enhanced productivity and reduced active nitrogen loss in summer maize-winter wheat cropping system: A field lysimeter experiment

Liu,

Xu,

et al. 2024

Field Crops Research

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Long-acting mechanisms of concentrated urea application — High urea concentrations are biological inhibitors

Cited by 4 publications

References 53 publications

Characteristics of N Transformation of Humic Acid Urea in Different Circle Layers of the Fertisphere: A Simulated Experiment

Characteristics of N Transformation of Humic Acid Urea in Different Circle Layers of the Fertisphere: A Simulated Experiment

Global evaluation of key factors influencing nitrogen fertilization efficiency in wheat: a recent meta-analysis (2000-2022)

Humic acid urea enhanced productivity and reduced active nitrogen loss in summer maize-winter wheat cropping system: A field lysimeter experiment

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