Soil pH effects on the distribution and plant availability of manganese, copper, and zinc. [Triticum aestivum]

Conference · · Soil Sci. Soc. Am. J.; (United States)

OSTI ID:5221800

Sims, J T

Crop response to micronutrient fertilization on the poorly buffered coastal plain soils of Delaware has received renewed interest in recent years. Specifically, given the susceptibility of these soils to overliming and the widespread use of manures, questions have been raised concerning the influence of soil pH and micronutrient source on the distribution and plant availability of Mn, Cu, and Zn. Four soils that varied widely in organic matter content (16-100 g/kg), texture, and cation exchange capacity (CEC) were studied. Micronutrient distribution among these fractions, was studied over a pH range of 4.0 to 7.7 in the soils alone, and in the same soils amended with poultry manure (PM) or (MnSO/sub 4/ + CuSO/sub 4/ + ZnSO/sub 4/). The various fractions of each element were then correlated with Mn, Cu, and Zn uptake by wheat (Triticum aestivum L.) in a greenhouse experiment. Soil pH markedly altered the distribution of Mn and Zn but had little effect on Cu. Although soil type did have some influence, exchangeable Mn and Zn were generally the dominant species of the elements below pH 5.2, while at higher pH values organically complexed and Fe-oxide bound forms were dominant. The majority of soil Cu was in the organic fraction, but considerable percentages were found in the amorphous Fe-oxide fraction. Organic ligands in the manure retained more Zn in a nonexchangeable form under acidic conditions, but had only minor effects on exchangeable Mn. Plant uptake of Mn and Zn was primarily related to the exchangeable fractions; however, predictive models were significantly enhanced by the inclusion of soil pH. Inconsistent correlations and low r/sup 2/ values for all models involving Cu illustrate the difficulty in predicting crop response to native or added Cu.

• Research Organization: Univ. of Delaware, Newark
• OSTI ID: 5221800
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Vol. 50:2; Conference: 50. annual meeting, Soil Science Society of America, New Orleans, LA, USA, 30 Nov-5 Dec 1986
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
COPPER
BIOLOGICAL AVAILABILITY
UPTAKE
MANGANESE
PH VALUE
SOILS
LIMING
ZINC
CATIONS
FERTILIZERS
ION EXCHANGE
IRON OXIDES
LIGANDS
MANURES
ORGANIC MATTER
ROOT ABSORPTION
SOIL CHEMISTRY
WHEAT
ABSORPTION
AGRICULTURAL WASTES
CEREALS
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
ELEMENTS
GRASS
IONS
IRON COMPOUNDS
METALS
ORGANIC WASTES
OXIDES
OXYGEN COMPOUNDS
PLANTS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)