The elimination of differences in investment in the evaluation of fertilizer analyses
1940
Andrews, W.B.
Fertilizer analyses tests are usually conducted on the basis of a given number of pounds per acre of the different analysis fertilizers. Where the percentages of nitrogen, phosphoric acid, and potash vary, there is in reality a rates test of all three elements. Where rates vary, the operation of the law of diminishing returns may prevent the interpreter from arriving at the analysis from which the farmer will obtain the most profit for the money invested in fertilizers. A method was presented for calculating the analysis from which a farmer would obtain the most profit for a definite amount of money invested in fertilizers. The method of eliminating differences in investment is based upon the data obtained from a rates of one analysis test which is conducted with the analysis test. The data are plotted and a curve of best fit is drawn. From the curve, the increase in yield from fertilizer equal in cost to the analysis fertilizer being compared with the plotted analysis fertilizer is obtained. With equal costs the best fertilizer may be determined and the calculations made for any convenient investment in fertilizer.
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