Acidification Induced by Different Nitrogen Sources in Columns of Selected Tropical Soils

Stumpe, J. M.; Vlek, Paul L. G.

doi:10.2136/sssaj1991.03615995005500010026x

Cited by 41 publications

(16 citation statements)

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“…The decline in exchangeable Ca was less pronounced than that reported by other workers (Juo and Lal, 1977;Pieri, 1989;Raney, 1960;Stumpe and Vlek, 1991). This may be attributed to lower leaching losses under a subhumid climate, the recycling of plant nutrients with the return of crop residues after harvest, and/or to the no tillage system used.…”

Section: " -mentioning

confidence: 57%

“…Differences in the rate of soil acidification with the three N sources are based on their potential acidification, which is twice that of urea for AS, and 85% that of urea for CAN (Stumpe and Vlek, 1991). Greater soil acidification with AS than with UA or CAN was previously found under field conditions by Brochado-Miranda (1976), Fox and Hoffman (1981), Jones (1976) and Khonje et al (1989) and under laboratory conditions by Stumpe and Vlek (1991). The ).…”

Section: " -mentioning

confidence: 81%

“…The use of ammoniacal fertilizers is likely to acidify soil, especially soil with low activity clays (Bolan et al, 1991;Stumpe and Vlek, 1991). Soil acidification causes increased solubility of A1 and Mn and loss of Ca and Mg through leaching, and can lead to nutrient deficiencies after a few years (Balasubramanian and Singh, 1982;Blevins etal., 1977;Jones, 1976;Haynes and Swift, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Acidification of a kaolinitic Alfisol under continuous cropping with nitrogen fertilization in West Africa

1995

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Increased use of N fertilizer and more intensive cropping due to the rising food demand in the tropics requires design and evaluation of sustainable cropping systems with minimum soil acidification. The objectives of this study were to quantify acidification of an Oxic Kandiustalf with different types of N fertilizer in two cropping systems under no-tillage and its effect on crop performance. Chemical soil properties in continuous maize (Zea mays L.) and maize-cowpea (Vigna unguiculata (L.) Walp) rotation were determined with three N sources (urea (UA), ammonium sulfate (AS) and calcium ammonium nitrate (CAN)) in Nigeria, West Africa, during five years. Chemical soil properties were related to grain yield and diagnostic plant nutrient concentrations. For the three N sources, the rate of decline in soil pH in maize-cowpea rotation was 57 ± 7.5% of that in continuous maize, where double the amount of N fertilizer was applied. The rate of soil acidification during the five years was greater for AS than for UA or CAN in continuous maize, and not different for UA and CAN in both cropping systems. With AS, soil pH decreased from 5.8 to 4.5 during five years of continuous maize cropping. Exchangeable acidity increased with N fertilization, but did not reach levels limiting maize or cowpea growth. Return of residues to the soil surface may have reduced soluble and exchangeable AI levels by providing a source of organic ligands. Soil solution Mn concentrations increased with N fertilization to levels likely detrimental for crop growth. Symptoms of Mn toxicity were observed on cowpea leaves where AS was applied to the preceding maize crop, but not on maize plants. Soil acidification caused significant reductions in exchangeable Ca and effective CEC. Main season maize yield with N fertilization was lower with AS than with UA or CAN, but not different between UA and CAN during the six years of cropping. The lower maize grain yield with AS than with the other N sources was attributed to lower pH and a greater extractable Mn concentration with AS. When kaolinitic Alfisols are used for continuous maize cropping, even under no-tillage with crop residues returned as mulch, the soil may become acidifed to pH values of 5.0 and below after a few years. The no-till cereal-legume rotation with judicial use of urea or CAN as N sources for the cereal crop is a more suitable system for these poorly buffered, kaolinitic soils than continuous maize cropping. The use of AS as N source should be avoided.

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Section: " -mentioning

confidence: 57%

Section: " -mentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Acidification of a kaolinitic Alfisol under continuous cropping with nitrogen fertilization in West Africa

1995

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“…8,9,10,11 and 12). The reason for slope values of less than 1 can be attributed to the protons being neutralized either by cation exchange or through plant uptake (Stumpe and Vlek 1991;Bolan et al 1991). While for the G12 soil, there must be other proton sources in addition to nitrification, which led to the higher slope of the line.…”

Section: Change In Soil Acidity and Salinitymentioning

confidence: 99%

Effects of nitrogen fertilization on the acidity and salinity of greenhouse soils

Han

Shi

Zeng

et al. 2014

Environ Sci Pollut Res

152

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A greenhouse pot experiment was conducted to study the effects of conventional nitrogen fertilization on soil acidity and salinity. Three N rates (urea; N0, 0 kg N ha(-1); N1, 600 kg N ha(-1); and N2, 1,200 kg N ha(-1)) were applied in five soils with different greenhouse cultivation years to evaluate soil acidification and salinization rate induced by nitrogen fertilizer in lettuce production. Both soil acidity and salinity increased significantly as N input increased after one season, with pH decrease ranging from 0.45 to 1.06 units and electrolytic conductivity increase from 0.24 to 0.68 mS cm(-1). An estimated 0.92 mol H(+) was produced for 1 mol (NO2 (-) + NO3 (-))-N accumulation in soil. The proton loading from nitrification was 14.3-27.3 and 12.1-58.2 kmol H(+) ha(-1) in the center of Shandong Province under N1 and N2 rate, respectively. However, the proton loading from the uptake of excess bases by lettuces was only 0.3-4.5 % of that from nitrification. Moreover, the release of protons induced the direct release of base cations and accelerated soil salinization. The increase of soil acidity and salinity was attributed to the nitrification of excess N fertilizer. Compared to the proton loading by lettuce, nitrification contributed more to soil acidification in greenhouse soils.

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“…In general, N fertilizers affect soil acidity because of the preferential uptake of nitrate-N to bases by most crops and the excretion of hydroxide ions to balance the charge reduces acidity (Jolley & Pierre 1977, Pierre et al 1971. Juo et al (1995aJuo et al ( , 1995bJuo et al ( , 1996 reported soil acidification followed by a considerable decline of exchangeable Ca in the topsoil horizons of the Egbeda series under continuous maize-based systems, which would arise from nutrient removal by crop harvest (Jaiyeoba 1995, Sharma et al 2009), application of ammoniacal fertilizers and nitrification of applied N (Stumpe & Vlek 1991). In this study, the application of triple super phosphate containing Ca (12%, w/w) may have helped to replenish the exchangeable Ca and prevent acidification in the soil of the cropland.…”

Section: Soil Chemical Propertiesmentioning

confidence: 99%

Comparison of Physicochemical Properties of Soils under Contrasting Land Use Systems in Southwestern Nigeria

Watanabe

Kikuno

Asiedu³

et al. 2015

JARQ

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Soil physicochemical properties were determined for soils under cropland and forest at the headquarters of the International Institute of Tropical Agriculture in Ibadan, Southwestern Nigeria to examine the 30-year effects of different land use on the fertility of five soil series toposequences underlain by a Basement Complex. The cropland had been under cultivation for 30 years, during which mainly maize and yams had been cultivated in rotation with application of chemical fertilizer and intermittent fallow, while the forest had secondary vegetation that had been regenerated during a 30-year period under protection. The findings for cropland indicated an accumulation of available phosphorus and exchangeable potassium, soil compaction and slight depletion of topsoil organic carbon content; and the findings for forest indicated soil acidification and accumulation of exchangeable Ca at the surface soil horizon. These findings suggest the possibility of maintaining soil fertility with a long-term intensive and continuous crop farming system in kaolinitic Alfisol soil over the inland valley toposequences of tropical Africa.

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Acidification Induced by Different Nitrogen Sources in Columns of Selected Tropical Soils

Cited by 41 publications

References 0 publications

Acidification of a kaolinitic Alfisol under continuous cropping with nitrogen fertilization in West Africa

Acidification of a kaolinitic Alfisol under continuous cropping with nitrogen fertilization in West Africa

Effects of nitrogen fertilization on the acidity and salinity of greenhouse soils

Comparison of Physicochemical Properties of Soils under Contrasting Land Use Systems in Southwestern Nigeria

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