Statistical methodology for setting legal allowances for nutrient contents of bagged fertilizer materials in the State of North Carolina

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Date
1988
Authors
NELSON,L.A.
MUNGAI,P.N.
PROCTOR,C.H.
STEVENS,J.R.
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Abstract
The process of establishing investigational allowances for fertilizer materials is reviewed. All sources of variation incurred in taking, preparing and analyzing an official sample of fertilizer are considered. The importance of ho.th theoretical and practical considerations is discussed. Use of the lechniques described is illustrated using a set of data involving five grades of commercial fertilizer. Sampling v.as by a hierarchical scheme. Estimates of variance components from these data were used in the estimation of the investigational allowances. Economic losses to the State of North Carolina. the farmers, and the manufacturer were estimated using various assumed prices and legal allowance establishment procedures. Setting the investigational allowances at 2.33 standard errors is confirmed.
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Journal Of Fertilizer Issues, 18, p. 71-99