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This article in SSSAJ

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


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doi:10.2136/sssaj1972.03615995003600010026x

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

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

Abstract

Abstract

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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