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Published in Soil Sci Soc Am J 26:178-182 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inefficiency of Fertilizer Use Resulting from Nonuniform Spatial Distribution: III. Fractional Segregation in Fertilizer Materials1

Don Jensen and John Pesek2

ABSTRACT

Partial stratification of dry-blended fertilizer materials may occur as a result of different physical properties of the component nutrient carriers. Nonuniform nutrient distributions arise, in spite of uniform application of the mixture, because nutrient ratios and analyses vary among strata. Nutrient segregation is illustrated by a linear relation between nutrient rate and distance traveled by a fertilizer applicator.

Fertilizer distributions may also be influenced by spreading characteristics of the fertilizer applicator. Yields associated with nonuniform application of a segregated mixture were evaluated by substituting an appropriate distribution function into a specific yield equation and integrating over the treated area.

Algebraic results of the derivations are illustrated numerically for corn produced on a calcareous Ida silt loam in Iowa. Yield losses induced by nutrient segregation alone may reach 5 bushels per acre for selected degrees of severity of stratification. For the particular distribution patterns considered, additional yield losses of up to 6.1 bushels per acre may result from nonuniform application of a segregated fertilizer mixture.

NOTES

1 Journal Paper No. J-4058 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1189. Research jointly sponsored by the National Science Foundation and the Department of Agronomy.

2 National Science Foundation Graduate Fellow and Professor of Soils, respectively.

Received for publication February 6, 1961. Accepted for publication April 5, 1961.






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