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Effects of Combinations of Triple Superphosphate and a Reactive Phosphate Rock on Yield and Phosphorus Uptake by Corn¹

ABSTRACT

A combination of finely ground phosphate rock (PR) and triple superphosphate (TSP) represents a method that can improve the agronomic value of PR at a lower cost than would be required to manufacture the conventional, fully acidulated fertilizers from that same rock. A reactive PR from North Carolina was evaluated for its effectiveness as a P source when used in conjunction with TSP at P rates up to 266 mg P kg^–1 in a short-term (6-week) greenhouse experiment. The soil used was a limed Mountview silt loam (Typic Paleudult) with pH 6.2. As measured by dry-matter yield and P uptake, P availability from PR appeared to increase with increases in the proportions of TSP to PR in the TSP-PR mixtures. Although PR alone was less effective than TSP, PR was just as effective as TSP when mixed with TSP at a P ratio of at least 1:1. Because plants responded to both TSP and PR, and because there was an interaction between TSP and PR in the soil, neither water solubility nor total citrate solubility could be used to predict the effectiveness of TSP-PR mixtures with different P ratios.

¹ Contribution from the International Fertilizer Development Center (IFDC) and the National Fertilizer Development Center (NFDC), Tennessee Valley Authority (TVA), Muscle Shoals, AL 35662.

² The first and fourth authors are Soil Chemist and Agronomist/Statistician, respectively, Agro-Economic Div., IFDC. The second and third authors are former Soil Chemists, Agricultural Research Branch, NFDC-TVA.

Received for publication February 12, 1987.

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