SPATIAL VARIATION OF EXTRACTABLE MICRONUTRIENTS IN A CULTIVATED AND A NATIVE PRAIRIE SOIL

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Abstract
The variability in DTPA-extractable micronutrients was studied for the A and B horizons of a cultivated site and its native prairie counterpart. The results showed that there was a high degree of variability in samples taken every meter on a 46-m long transect. There were large differences among the cultivated and native prairie soils, the two soil horizons and the four micronutrients studied. In cultivated fields, larger numbers of samples were required for Cu and Mn than for Zn and Fe to obtain a precise estimate of the mean. The number of samples becomes critical as deficiency levels are approached. Key words: Soil sampling, sample size, soil variability

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