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Soil Science Society of America Journal Abstract -

Variations with Distance in Selected Fertility Measurements of Pedons of Western Kansas Ustoll1


This article in SSSAJ

  1. Vol. 36 No. 1, p. 111-115
    Received: Nov 3, 1970
    Accepted: Oct 26, 1971

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  1. Jan E. Cipra,
  2. Orville W. Bidwell,
  3. David A. Whitney and
  4. A. M. Feyerherm2



This investigation of the fertility status of Richfield silt loam, 0 to 1% slope, indicates that adequate fertility characterization of a soil series requires many more samples than are commonly taken. Sixteen sampling sites were used in each of seven 2.4-ha (6-acre) fields 8 to 145 km (5 to 90 miles) apart. We located four plots 90 m (300 feet) apart in each field and four sampling sites 3 m (10 feet) apart in each plot. Samples of Ap, B2t, and C horizons were collected from each site. Organic matter, P, K, Zn, and pH were determined in duplicate using procedures of the Kansas State Soil Testing Laboratory. Within-plot variance component estimates were small for most horizon and fertility-test combinations. Variance among plots was greater than within plots for 11 of the 15 combinations. Variance among fields was predominant in 8 of the 15 combinations, and accounted for more than 50% of the total variance in 5 of the 15 combinations. Results indicate that estimating the series means within ± 10% would require the most samples for P and the least for pH.

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