Long-term acidification of a Brazilian Acrisol as affected by no till cropping systems and nitrogen fertiliser

Vieira, Frederico Costa Beber; Bayer, Cimélio; Mielniczuk, João; Zanatta, Josiléia Acordi; Bissani, Carlos Alberto

doi:10.1071/sr07088

Cited by 40 publications

(26 citation statements)

References 19 publications

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“…The soil management systems did not affect the pH or exchangeable Al content. The increased soil acidity, also demonstrated by the low base and high Al saturation, was mainly due to the extraction of bases by harvest removal of grains during this long period (26 years) without liming, while nitrate leaching may also have contributed slightly to soil acidification (Vieira et al, 2008).…”

Section: Chemical Properties Of the Soil Solid Phasementioning

confidence: 99%

Aluminum hydroxy-interlayered minerals and chemical properties of a subtropical Brazilian Oxisol under no-tillage and conventional tillage

Inda

Torrent

Barrón

et al. 2010

Rev. Bras. Ciênc. Solo

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No tillage systems significantly influence the soil system, but knowledge about the effects on the mineralogy of tropical and subtropical soils is limited. This study evaluated the long-term effects (26 years) of no-tillage (NT) on aluminum hydroxy-interlayered minerals of a subtropical Oxisol in Southern Brazil (Guarapuava, PR), compared to the same soil under conventional tillage (CT). The clay fraction (< 2 μm) in soil samples of the surface horizons of a field experiment under both management systems was analyzed by X-ray diffraction (XRD) to identify and characterize Al hydroxy-interlayered minerals before and after treatment with sodium citrate to remove intra-layer material. Soil liquid (solution) and solid phases were also characterized. The contents of total organic C, exchangeable cations, P, and the values of extractable acidity and cation exchange capacity as well as electrical conductivity and levels of dissolved organic C, basic cations, aluminum, Si, and sulfur in the soil solution were higher in the NT soil. Under both soil management systems, more than 90 % of the total soluble Al was complexed with organic compounds, with similar Al activity. No significant changes were detected by 2:1 clay mineral XRD analyses in terms of extension or intercalation of Al-hydroxy-polymers in the no-tilled in comparison to the conventionally tilled soil. In both soil management systems, Al and Si activities in the soil solution indicated thermodynamic stability of 2:1 clay minerals with partially occupied by hydroxy-Al, suggesting deceleration in the intercalation process and a tendency of transforming clay minerals from extensive into partial intercalation.Index terms: HIS, HIV, organic carbon, soil management systems, mineral stability.(

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Section: Chemical Properties Of the Soil Solid Phasementioning

confidence: 99%

Aluminum hydroxy-interlayered minerals and chemical properties of a subtropical Brazilian Oxisol under no-tillage and conventional tillage

Inda

Torrent

Barrón

et al. 2010

Rev. Bras. Ciênc. Solo

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“…The long-term effusion of nitrogen fertilizer affects its surrounding environment, including the river. In many studies, overuse of nitrogen fertilizer is a cause of soil acidifi cation [27][28][29][30].…”

Section: Long-term Spatial and Longitudinal Analysismentioning

confidence: 99%

Long-Term Changes in Water Quality and Eutrophication of China’s Liujiang River

Jiang

Chen

Luo

et al. 2016

Pol. J. Environ. Stud.

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Long-term changes of water temperature, DO, pH, TN, NH 4 -N, TP, and COD Mn were examined at eight sampling stations along the Liujiang River. Water quality parameters showed considerable spatial and temporal variability. Annual averages of those parameters were 22.1ºC, 7.8 mg/L, 7.58, 1.35 mg/L, 0.27 mg/L, 0.06 mg/L, and 1.7 mg/L, respectively. An increasing trend for TN/TP and a decreasing trend for pH were observed in all parts of the Liujiang. Pollution levels were generally higher in the lower Liujiang than in the upper and middle parts of the river due to the impact of urban sewage. All indicators reached level III water quality standards except TN, which suggests that the control of nitrogen emissions should be strengthened. Relatively high N/P ratios in the Liujiang contribute to a potential for phosphorus limitation of phytoplankton. The average concentration of Chlorophyll-a was 1.2 μg/L in 2014. The TLI index indicated that the eutrophication state of the Liujiang was mesotrophic, while the downstream water was polluted due to its nutrient inputs from agriculture and urban sources. The water quality of the river keeps well by comparison to other major rivers of the world, which provided the basis for urban development and river protection in Liuzhou City.

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“…Thus, N volatilization is favored by high urease activity in the surface layer of no-tilled soils (Barreto & Westerman, 1989) and the presence of straw on the soil surface, which limits contact between the soil and the fertilizer (Menguel, 1996). However, high soil moisture, organic matter content and CEC levels in the surface layer of NT soils are important factors increasing the buffer capacity of soil pH variation (Vieira et al, 2008) with possible effects decreasing NH 3 volatilization (Ferguson et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

Ammonia volatilization in no-till system in the south-central region of the State of Paraná, Brazil

Fontoura¹,

Bayer

2010

Rev. Bras. Ciênc. Solo

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SUMMARYAmmonia (NH 3 ) volatilization can reduce the efficiency of urea applied to the surface of no-till (NT) soils. Thus, the objectives of this study were to evaluate the magnitude of NH 3 losses from surface-applied urea and to determine if this loss justifies the urea incorporation in soil or its substitution for other N sources under the subtropical climatic conditions of South-Central region of Paraná State, Brazil. The experiment, performed over four harvesting seasons in a clayey Hapludox followed a randomized block design with four replicates. A single dose of N (150 kg ha -1 ) to V5 growth stage of corn cultivated under NT system was applied and seven treatments were evaluated, including surface-applied urea, ammonium sulfate, ammonium nitrate, urea with urease inhibitor, controlled-release N source, a liquid N source, incorporated urea, and a control treatment with no N application. Ammonia volatilization was evaluated for 20 days after N application using a semiopen static system. The average cumulative NH 3 loss due to the superficial application of urea was low (12.5 % of the applied N) compared to the losses observed in warmer regions of Southeastern Brazil (greater than 50 %). The greatest NH 3 losses were observed in dry years (up to 25.4 % of the applied N), and losses decreased exponentially as the amount of rainfall after N application increased. Incorporated urea and alternative N sources, with the exception of controlled-release N source, decreased NH 3 volatilization in comparison with surface-applied urea. Urea incorporation is advantageous for the reduction of NH 3 volatilization; however, other aspects as its low operating efficiency should be considered before this practice is adopted. In the South-Central region of Paraná, the low NH 3 losses from the surface-applied urea in NT system due to wet springs and mild temperatures do not justify its replacement for other N sources.Index terms: nitrogen fertilizer, urea, corn, urease.(

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Long-term acidification of a Brazilian Acrisol as affected by no till cropping systems and nitrogen fertiliser

Cited by 40 publications

References 19 publications

Aluminum hydroxy-interlayered minerals and chemical properties of a subtropical Brazilian Oxisol under no-tillage and conventional tillage

Aluminum hydroxy-interlayered minerals and chemical properties of a subtropical Brazilian Oxisol under no-tillage and conventional tillage

Long-Term Changes in Water Quality and Eutrophication of China’s Liujiang River

Ammonia volatilization in no-till system in the south-central region of the State of Paraná, Brazil

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