Exchangeable aluminum evaluation in acid soils
نویسندگان
چکیده
منابع مشابه
Exchangeable Aluminum Evaluation in Acid Soils
One of the main factors limiting agricultural production in tropical climate regions is mainly related to the presence of exchangeable aluminum (Al) in highly weathered acid soils. Four methods of Al determination extracted with neutral 1 mol L KCl solution were evaluated: three colorimetric methods (aluminon plus ascorbic acid, and eriochrome cyanine R by FIA) and the usual titrimetric method ...
متن کاملAcid Soils and Aluminum Toxicity
Acid soils limit crop production on 30-40% of the world’s arable land and up to 70% of the world’s potentially arable land (Haug, 1983). Although the poor fertility of acid soils is due to a combination of mineral toxicities (aluminum and manganese) and deficiencies (phosphorus, calcium, magnesium, and molybdenum), Al toxicity is the single most important factor, being a major constraint for cr...
متن کاملA New Method for the Determination of Exchangeable Aluminium in Acid Soils*
In addition to A1 in the crystal lattice of clay minerals, A1 in soils can be divided into two major groups viz., exchangeable and non-exchangeable. The A1 equilibrium in soils is controlled by the solubility of the solid phase A1 compounds on the one hand and the adsorption characteristics of the adsorption phase on the other. Thus for a given soil the amount of exchangeable A1 will depend on ...
متن کاملDetermination of exchangeable inorganic nitrogen species in wetland soils.
Thredbo Vi l lage, an Austral ian Alpine resort , discharges secondary treated sewage e f f luen t through an adjacent wetland area to trap suspended and dissolved material before water is discharged into the Crackenback r i ve r (Brodrick 1985). We are current ly evaluating the effect iveness of th is wetland in removing nitrogen species from the sewage e f f luen t by d e n i t r i f i cation...
متن کاملAluminum, a Friend or Foe of Higher Plants in Acid Soils
Aluminum (Al) is the most abundant metal in the earth's crust, but its availability depends on soil pH. Despite this abundance, Al is not considered an essential element and so far no experimental evidence has been put forward for a biological role. In plants and other organisms, Al can have a beneficial or toxic effect, depending on factors such as, metal concentration, the chemical form of Al...
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ژورنال
عنوان ژورنال: Scientia Agricola
سال: 2003
ISSN: 0103-9016
DOI: 10.1590/s0103-90162003000300020