Alkaline hydrolyzable nitrogen and properties that dictate its distribution in paddy soil profiles

Drescher, Gerson Laerson; Silva, Leandro Souza da; Sarfaraz, Qamar; Molin, Gustavo Dal; Marzari, Laura Brondani; Lopes, Augusto Ferreira; Cella, Cesar; Facco, Daniela Basso; Hammerschmitt, Rodrigo Knevitz

doi:10.1016/s1002-0160(20)60012-1

Cited by 15 publications

(7 citation statements)

References 39 publications

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“…In contrast to STC, the difference among linear regression coefficients indicated the amount of STN recovered as AH-N changed with depth and was greatest at 30-to-45-cm (18%, N-STaR) or 45-to-60-cm depth (16%, ISNT). These results are in agreement with previous research documenting STN recovered as AH-N changed with sampling depth (Drescher et al, 2020) and represented 11-38% of STN in silt loam soils cropped to rice . The linear regression across sites and sampling depths between STN recovered as N-STaR and STN recovered as ISNT exhibited a significant, positive slope that was nearly one (Y = 0.996x + 1.4, p < .001; Figure 1).…”

Section: Fractional Recovery Of Ah-n Changes With Stc Stn and Samplin...supporting

confidence: 93%

“…Recently, Fulford et al (2019) successfully used AH-N (by N-STaR and ISNT) to predict fertilizer-N response of rice when clayey soils were sampled to 60 cm, stimulating additional interest in understanding how sampling depth effects the relationship between AH-N and other measurements related to soil organic matter such as STC and STN. Soil test methods such as ISNT or N-STaR quantify an alkaline hydrolyzable fraction of STN (Bushong et al, 2007;Otto et al, 2013), the recovery of which has been shown to be directly influenced by STN and indirectly influenced by STC (Drescher et al, 2020). Twenty-six to 75% of the variability in N-STaR was attributed to changes in STC among the 15-cm increments, although, depth-averaged STC from 0 to 30, 0 to 45, or 0 to 60 cm failed to account for a greater amount of variability in N-STaR.…”

Section: Fractional Recovery Of Ah-n Changes With Stc Stn and Samplin...mentioning

confidence: 99%

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Soil total carbon and nitrogen as indicators of rice response to supplemental fertilizer nitrogen

Fulford

Roberts²

2022

Soil Science Soc of Amer J

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Supplemental fertilizer N recommendations for flood‐irrigated rice (Oryza sativa L.) have been developed with tests that quantify plant‐available N within the effective rooting depth. Alkaline hydrolyzable‐nitrogen (AH‐N) soil test methods were recently used to successfully guide supplemental fertilizer‐N management decisions of drill‐seeded, delayed‐flood rice, stimulating interest in evaluating additional indicators of N availability such as soil total carbon (STC) and soil total nitrogen (STN). Our first objective was to evaluate the relationship among STC, STN, and AH‐N to a depth of 60 cm. Our second objective was to correlate STC and STN to rice N uptake and grain yield and develop calibration regression models that identified the yield maximizing N rate (FN 95%RGY). The STC and STN were significantly and positively related to AH‐N when clayey soils were sampled to >15‐cm depth and the coefficient of determination (r2) exhibited a range of .22–.70 for STN and .26–.75 for STC. Overall, STC and STN were significantly related to rice N uptake, unfertilized grain yield (Yield0N), or relative grain yield (RGY) and r2 values tended to be greatest at a 30‐cm depth or only nominally improve when sampling depth exceeded 30 cm. Calibration of STC and STN to predict FN 95%RGY was successfully completed, but all linear regressions had r2 < .40. The influence of sampling depth on the ability of STC and STN to serve as indicators of rice response to supplemental N fertilization demonstrates the utility of sampling within the rice plant's effective rooting depth.

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Section: Fractional Recovery Of Ah-n Changes With Stc Stn and Samplin...supporting

confidence: 93%

Section: Fractional Recovery Of Ah-n Changes With Stc Stn and Samplin...mentioning

confidence: 99%

Soil total carbon and nitrogen as indicators of rice response to supplemental fertilizer nitrogen

Fulford

Roberts²

2022

Soil Science Soc of Amer J

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“…Up to now, few studies have focused on the distribution of soil nitrogen in soil profiles, especially for agricultural ecosystems. Farmland soil nitrogen in different regions showed a variety of changes in soil profile: the alkaline hydrolyzable nitrogen contents below 20 cm varied extensively (increased, reduced, or constant) compared with that above 20 cm in Southern Brazil [3]. The dissolved organic nitrogen (DON) content showed a steep decrease with the increase of paddy soil depth in Fuzhou, China, while the proportion of DON to total dissolved nitrogen (TDN) increased from 54-64% to 63-97% [4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Climate, Soil Properties and Vegetation on Soil Nitrogen in Sloping Farmland

et al. 2021

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Soil nitrogen in farmland ecosystems is affected by climate, soil physical and chemical properties and planting activities. To clarify the effects of these factors on soil nitrogen in sloping farmland quantitatively, the distribution of soil total nitrogen (TN) content, nitrate nitrogen (NO3-N) content and ammonium nitrogen (NH4-N) content at depth of 0–100 cm on 11 profiles of the Luanhe River Basin were analyzed. Meanwhile, soil physical and chemical properties, climatic factors and NDVI (Normalized Difference Vegetation Index) were used to construct a structural equation which reflected the influence mechanism of environmental factors on soil nitrogen concentration. The results showed that TN and NO3-N content decreased with the increase of soil depth in the Luanhe River Basin, while the variation of NH4-N content with soil depth was not obvious. Soil organic carbon (SOC) content, soil pH, soil area average particle size (SMD) and NDVI6 (NDVI of June) explained variation of TN content by 77.4%. SOC was the most important environmental factor contributing to the variation of TN content. NDVI5 (NDVI of May), annual average precipitation (MAP), soil pH and SOC explained 49.1% variation of NO3-N content. Among all environmental factors, only NDVI8 (NDVI of August) had significant correlation with soil NH4-N content, which explained the change of NH4-N content by 24.2%. The results showed that soil nitrogen content in the sloping farmland ecosystem was mainly affected by natural factors such as soil parent material and climate.

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“…Nitrogen is also a key nutrient for plant growth. As a soil index, hydrolysable nitrogen had a high correlation with total nitrogen and was used to represent soil nitrogen availability (Drescher et al, 2020). In addition, organic carbon can influence the physical, chemical, and biological characteristics of soil, improve soil fertility and maintain continuous soil production.…”

Section: Resultsmentioning

confidence: 99%

Magnesium slag for remediation of cadmium‐ and arsenic‐contaminated paddy soil: A field study

Zhang

Tan

Duan

et al. 2022

Soil Use and Management

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The accumulation of heavy metals like cadmium (Cd) and metalloids like arsenic (As) in plants can do harm to human health through the food chain, especially through the rice (Oryza sativa L.). To solve this problem, this study researched the application of magnesium slag (MS) and polyaspartic acid (PASP), which could accelerate rice growth and improve yield, increase soil pH and activate rice enzyme activity as well as reduce the bioavailability of Cd and As in the soil. After these two different treatments, rice yield increased by 17.0% and 18.9%, respectively. Meanwhile, the bioavailable As decreased by 49.1% and 42.5%, while the bioavailable Cd reduced by 72.6% and 44.3%. Besides, the Cd content in rice grains reduced by 77.7% and 17.3%, respectively, after two different treatments. In the MS treatment, the As content in rice grains was reduced by 21.8%, but showed no significant response to the other treatment. The contents of bioavailable Cd and As (determined by one‐step extraction) in soil were decreased by MS and PASP, which was favourable for the reduction of Cd and As accumulation in rice. The health risk assessment showed that the application of passivators can effectively reduce the risk of carcinogenesis, but it was still unacceptable. The application dose of MS and PASP still needs further exploration.

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Alkaline hydrolyzable nitrogen and properties that dictate its distribution in paddy soil profiles

Cited by 15 publications

References 39 publications

Soil total carbon and nitrogen as indicators of rice response to supplemental fertilizer nitrogen

Soil total carbon and nitrogen as indicators of rice response to supplemental fertilizer nitrogen

The Influence of Climate, Soil Properties and Vegetation on Soil Nitrogen in Sloping Farmland

Magnesium slag for remediation of cadmium‐ and arsenic‐contaminated paddy soil: A field study

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