Evaluation of the ammonium bicarbonate-DTPA soil test for assessing boron availability to alfalfa
Seven soils from Colorado which varied in texture and organic matter content were treated with sodium borate (Na/sup 2/B/sup 4/O/sup 7/ x 10H/sup 2/O) at 0, 1, 3, 5, and 10 ..mu..g B/g soil. Alfalfa (Medicago sativa var. 'Ladak') was planted in the soils in the greenhouse and then cut three times at the 30% bloom stage. Plant tissue digests and soil extracts (AB-DTPA, hot-water, saturation) were analyzed for B using inductively coupled plasma atomic emission spectroscopy (ICP-AES). Saturation and AB-DTPA extractable B levels were nearly identical while the hot-water soil test extracted significantly higher amounts of B. Alfalfa yields were not significantly affected by increasing B application rates indicating B deficiency and toxicity conditions were not present. Plant B was highly correlated to all three extractants for the individual soils; however, the coefficients of determination (r/sup 2/) for plant B and soil B differed appreciably when the pooled soils were analyzed statistically: r/sup 2/ = 0.51 for AB-DTPA, r/sup 2/ = 0.87 for hot water, r/sup 2/ = 0.76 for saturation extract, indicating the superiority of the hot-water extractant for B. Multiple linear regression analysis also indicated the superiority of the hot-water extractant and denoted that NH/sub 4/HCO/sub 3/-DPTA soil test required the addition of soil variables (soil pH, % OM, % clay) to be considered an effective test.
- Research Organization:
- Univ. of Southwestern Louisiana, Lafayette
- OSTI ID:
- 6799311
- Journal Information:
- Soil Sci. Soc. Am., Proc.; (United States), Vol. 48:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALFALFA
PLANT GROWTH
BORON
BIOLOGICAL EFFECTS
COLORADO
SOILS
SOIL CHEMISTRY
AMMONIUM COMPOUNDS
AVAILABILITY
DTPA
EVALUATION
PH VALUE
REGRESSION ANALYSIS
AMINO ACIDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMISTRY
DRUGS
ELEMENTS
FEDERAL REGION VIII
GROWTH
LEGUMINOSAE
MATHEMATICS
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RADIOPROTECTIVE SUBSTANCES
SEMIMETALS
STATISTICS
USA
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)