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Soil Phosphorus Variability in Pastures

Implications for Sampling and Environmental Management Strategies

^a Univ. of Arkansas Coop. Ext. Service, 2301 S. University Ave., Little Rock, AR 72203
^b Dep. of Crops, Soils, and Environmental Sciences, Univ. of Arkansas, Fayetteville, AR 72701
^c Jr. USDA-ARS, Poultry Production & Product Safety Research Unit, Fayetteville AR, 72701
^d Agricultural Statistics Lab., Univ. of Arkansas, Fayetteville, AR 72701

View larger version (21K): [in a new window]   Fig. 1. The probability of obtaining an estimate within the 95% confidence interval of the mean soil P as a function of number of subsamples.

View larger version (32K): [in a new window]   Fig. 2. Minimum number of subsamples required in a zig-zag pattern to obtain an estimate of soil P with >0.9 level of probability within 10 and 20% of the measured mean, within the 95% confidence interval of the measured mean, and within 15 mg kg-1 soil P for pastures with less than 30 samples taken.

View larger version (39K): [in a new window]   Fig. 3. Minimum number of subsamples required in a zig-zag pattern to obtain an estimate of soil P with >0.9 level of probability within 10 and 20% of the measured mean, within the 95% confidence interval of the measured mean, and within 15 mg kg-1 soil P for pastures with greater than 96 samples taken.

View larger version (16K): [in a new window]   Fig. 4. Relationship of probability of obtaining an estimate that exceeds 150 mg kg-1 and the number of subsamples in pasture RV1.

View larger version (10K): [in a new window]   Fig. 5. Relationship of percentage of pasture <150 mg kg-1 to mean soil phosphorus (P) for 12 Arkansas pastures.