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The first column indicates the company, address, and county number where the sample was obtained. Under the column labeled “Grade” is the guaranteed analysis. The results of the laboratory tests are shown under the columns to the right of the grade. Those numerals with an asterisk (*) indicate a deficient nutrient.
A small laboratory tolerance is allowed to determine whether samples are marked deficient. These analytical tolerances are applied to compensate for reasonable and unavoidable variations in sampling, reducing the composite sample to the working sample and making the analysis.
We are including a column headed “ REL VAL” for each fertilizer with a deficient nutrient. Indexing the values of fertilizers with a deficient nutrient will give a better indication of the value received by the Iowa farmers. Generally, we refer to indexing as relative value showing overage as well as showing deficiency. This also gives a clearer picture of the fertilizer value.
The abbreviations on the far right indicate the type of product samples; those not designated are combined products.
KEY TO ABBREVIATIONS
CML………Custom Mix Liquid LIQ…………..Liquid
CMD……...Custom Mix Dry Dry…………...Dry
RELATIVE VALUE (REL VAL)
Example of Calculation
Relative value is calculated as follows:
Example of a 10-10-10 grade found to contain 10.1% Soluble Potash (K2O).
Nutrient Unit values are assumed to be 2 per unit N, 2 per unit P2O5, and 1 per unit K2O
10 units N x2 = 20 10.1 units N x2 = 20.2
10 units P2O5 x2 = 20 9.0 units P2O5 x2 = 18.0
10 units K2O x1 = 10 10.1 units K2O x1 = 10.1
Guaranteed Value = 50 Laboratory Value = 48.3
Relative Value (48.3/50) = 96.6%
Any fertilizer with a deficient nutrient that falls below 98% relative value is considered in violation.
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