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Comparison of a Spent Boron-phosphate Catalyst with Sodium Borate as a Source of Boron for Cotton¹

Greenhouse and field experiments were conducted to evaluate NSC, a spent catalyst by-product of the Monsanto Company, as a source of B for cotton (Gossypium hirsutum L.). Greenhouse experiments were conducted using Norfolk ls, Hartsells fsl, and Decatur cl. Soils were limed and fertilized for maximum yields with the exception of B, which was added from sodium borate and NSC, at rates of 0.5 ppm to 7.5 ppm B. High rates were to determine toxic effects. No increases in seedling top growth of cotton plants were obtained for B after 6 weeks growth in greenhouse tests. No reduction in seedling top growth was obtained on any soil at 7.5 ppm B, the highest rate of NSC. On Norfolk soil , plant concentration ranged from 43 ppm B with no B added to 352 ppm with 7.5 ppm B. Boron concentration of cotton on Hartsells soil ranged from 42 to 172 and from 67 to 131 ppm on Decatur soil at 0 and 7.5 ppm applied B, respectively. Seed cotton yield was increased in one of five field experiments from the addition of B from both NSC and sodium borate. On the other soils, there was no response to B from either source. Except on one soll type, leaf samples showed an increase in B content from all plots receiving B (from either source) when compared to no B added.

Key Words: Micronutrients • Gossypium hirsutum L.

² Graduate Assistant and Professor, Department of Agronomy and Soils.

Received for publication June 9, 1971.