Influence of phosphorus sources and rates on soil pH, extractable phosphorus, and DTPA-extractable micronutrients
Two soils (McLain sicl-fine, mixed, thermic, Pachic Argiustoll and Quinlan cl-loamy, mixed, thermic, shallow Typic Ustocrept) that differed in micronutrient content and chemical characteristics were collected from western Oklahoma. Soils were passed through a 2-mm screen and placed in plastic Petri dishes, and five P levels (0, 20, 40, 60, and 80 kg ha/sup -1/) were applied using monocalcium phosphate (MCP), monoammonium phosphate (MAP), and ammonium polyphosphate (APP); the soils were then mixed uniformly. Soils were moistened to approximately 0.33 MPa and incubated for 2 mo at room temperature. Application of P decreased soil pH in both soils, and MAP and APP had a greater effect than MCP, which was attributed to the nitrification of the added ammonium. Bray and Kurtz no. 1 P increased with P application in both soils. Monocalcium phosphate and MAP decreased DTPA-Fe, -Mn, and -Cu in McLain soil. However, high levels of P applied as APP increased DTPA-Fe, -Mn, and -Cu. Phosphorus application, regardless of source, had no effect on DTPA-Zn in McLain soil. Monocalcium phosphate and MAP decreased DTPA-Mn in the Quinlan soil; however; high levels of P applied as APP increased DTPA-Fe. Phosphorus application, regardless of source, had no effect on DTPA-Zn and -Cu in Quinlan soil.
- Research Organization:
- Oklahoma State Univ., Stillwater (USA)
- OSTI ID:
- 5318924
- Journal Information:
- Soil Sci.; (United States), Vol. 144:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FERTILIZERS
ENVIRONMENTAL EFFECTS
NUTRIENTS
BIOLOGICAL AVAILABILITY
PHOSPHORUS
AMMONIUM PHOSPHATES
CALCIUM
CALCIUM PHOSPHATES
COPPER
DTPA
GREAT PLAINS
IRON
MANGANESE
NITRIFICATION
OKLAHOMA
PH VALUE
SOIL CHEMISTRY
SOILS
ZINC
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
AMINO ACIDS
AMMONIUM COMPOUNDS
CALCIUM COMPOUNDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL REACTIONS
CHEMISTRY
DRUGS
ELEMENTS
FEDERAL REGION VI
METALS
NONMETALS
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIOPROTECTIVE SUBSTANCES
TRANSITION ELEMENTS
USA
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)