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Showing 1 to 20 of 23 for “"acid soils"”.
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Some factors affecting anion retention in acid soils
… anions themselves in the anion retention in an acid red soil. It was found that chloride was held much less tightly than sulfate by soils. It was also noted that more sulfate was retained at higher concentration. A time factor was also noted in this investigation. It took a longer period to …
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The potential of lime-stabilized and chemically-fixed municipal sewage sludges for land application as lime or nitrogen sources
… characterized for utilization as amendments to acid soils. Laboratory incubation studies were employed to evaluate calcium carbonate equivalence (CCE) and nitrogen (N) mineralization rates of these sludges when applied to three acid Typic Hapludults from Virginia. Greenhouse studies were …
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ΠΑΡΑΛΑΒΗ ΜΟΡΦΩΝ ΑΡΓΙΛΙΟΥ ΤΟΥ ΕΔΑΦΟΥΣ (ΝΕΑ ΜΕΘΟΔΟΣ ΜΕ ΠΥΡΟΚΑΤΕΧΙΝΗ)
… ALUMINUM HYDROXIDES, SILICATE MINERALS AND ACID SOILS WERE TREATED REPEATEDLY WITH 50 ML OF 0,1M SOLUTION OF CATECHOL AT 80 CIN THE PRESENCE OF 1ML 5% NH3.THE EXTRACTED QUANTITIES OF AL AND FE WERE COMPARED WITH THOSE EXTRACTED BY THE CBD METHOD. THE RESULTS OF THE PROCEDURE ENCOURAGES US TO …
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Evaluation of the contribution of residual fertilizer phosphorus to phosphate status and plant growth under conservation agriculture practice
… therefore, of great importance, especially in acid soils where the amounts of residual P which is not plant available can be significant. This study was conducted to establish the levels of residual fertilizer P in soils that had been under CA for five years and to investigate whether the …
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Long-term effects of alum sludge application to land
… not be confirmed in this research. However, acid precipitation may have destroyed the alkalinity added to the soil. Thus, long-term management of alum sludge land application to acid soils may require additional increments of alkalinity.
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A study of the pH-dependent charge of a selection of highly weathered humic soils
Acid soils have long been associated with increased mobility of metals and the subsequent nutrient toxicity to plants, the cause of which is believed partly to be a reduction in cation exchange capacity (CEC). At the same time the reduction in CEC would result in a decline in the soil's ability to …
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Penggunaan multi isolat bakteri pelarut fosfat, pupuk SP36 dan pupuk organik cair untuk meningkatkan produktifitas tanaman kedelai (Glycine max L. Merril) di tanah masam
… on sour land located outside Java, while the acid soils generally contain Al, Fe, Mn is very high and the N, P, K, Ca, Mg, and Mo are very low, it is this which leads to constraints on increasing production of soybeans (Glycine max L. Merrill) in the Land of Sour. This study aims to determine …
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The amendment of acid soil with an ettringitic waste and its effects on plant growth
… that the waste had potential as an ameliorant of acid soil, research into this possibility was initiated. Following the determination of a calcium carbonate equivalent (HCl-CCE) value of 78% using the HCl back titration method of Horwitz (1980), an incubation experiment was initiated using three …
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Response of wheat (Triticum Aestivum)to Vesicular Arbuscular Mycorrhiza(VAM) and Trichoderma on grain yield and uptake of phosphorous in Acidic Soils
… due to low wheat production (< 1.5 ton/ha) in acidic soils, and the country’s total demand of about 240,000 metric tones as at 2010, is unable to be met. Acid soils generally cover a large part of the Zambian soils and have problems of low soil fertility including aluminium toxicity, low pH and …
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Managing symbiotically-fixed nitrogen on mined land for tree crops
Young mine soils constructed following surface-mining for coal contain low levels of organic matter and nitrogen. It was hypothesized that nitrogen-fixing plants could be incorporated into a reforestation system in a manner that would meet the short term and long-term nitrogen needs of crop trees …
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Impact of soil acidity on groundnut productivity in Mpumalanga and KwaZulu - Natal Province
… and the Northern coast of KwaZulu-Natal. These soils are highly susceptible to leaching, which leads to acid-soil infertility. The goal of the current study was to examine the fertility status of the soils where groundnuts are grown traditionally in Mpumalanga and KwaZulu-Natal in relation to …
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Hydrolysis of formamide and volatilization of ammonia from nitrogen fertilizers added to soils
… the reaction of Fe('3+) with the formohydroxamic acid produced from the reaction of formamide with hydroxylamine under alkaline conditions. Application of the method to soil extracts obtained with 2 M KCl made 5 mM with respect to uranyl acetate showed quantitative recovery (98 to 101%) of …
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Alfalfa growth on acid soil as influenced by Al, Ca, pH and Mo
Soil acidity is a major cause of low yields of alfalfa (Medicago sativa L.) in the southeastern United States. Two field experiments were conducted on an Ernest silt loam soil (fine—loamy, mixed, mesic Aquic Fragiudult) to determine what conditions are necessary for optimal alfalfa growth in an …
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Carbon dioxide emissions from selected soils in Zambia : effects of nitrogenous fertilizer and agricultural lime.
Soils can serve as sources or sinks of atmospheric carbon dioxide (CO2) depending on how they are managed. As atmospheric CO2 concentrations continue to rise there is need to find ways of reducing CO2 emissions from soils. This study was conducted to assess the effects of applying agricultural lime …
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Spectroscopy as a tool for the management of soil acidification
Globally, soil acidity is a significant problem for crop production. It affects both surface and subsurface soils, reduces availability of essential nutrients, increases aluminium toxicity generating yield losses and reduces productivity in agricultural crops. While lime (CaCO3) application is an …
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Chemisorption of ammoniacal nitrogen by clays
… between pH and ammonia equilibria in soils revealed that an increase in the concentration of ammonium ions, applied as ammonium sulfate, stimulated ammonia losses from fine-textured soils at pH's ranging from 4.5 to 7.1. Ammonia volatilization was directly related to the initial pH of …
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Novel Coated Fertilizers as Multi-Nutrient Sources for Soybeans and Tomatoes
… production despite having low nutrient soils. The soils in this region are predominantly coarse-textured acid soils with low cation exchange capacities (CEC) (< 3 cmol kg-1) and thus frequently exhibit nutrient deficiencies, including cationic nutrients which are not easily lost by …
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Nutrient fluxes and soil microbial processes
… forest dieback, drought, as well as soil acidification have caused negative ecological impacts in many sites. Conversion of conifers into deciduous or mixed stands has been suggested by some foresters, in order to improve the stability, ecology and biodiversity of forest ecosystems. Such …
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A study on the water chemistry and plankton in blackwater lakelets of the south-western Cape
… inorganic chemical environments of the vleis. Acid, well-leached soils and calcareous sands resulted in mean pH values of 3.8 and 4.2 in Suurdam and Gillidam and 8.0 and 8.6 in Grootwitvlei and Rondevlei. The cation composition of the vleis on well-leached acid soils was primarily determined by …
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