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Abstract

The objective of the present work was to study the effect of plant growth regulators on cassava productivity (Manihot esculenta Crantz cv Branca de Santa Catarina). The experiment was carried out on the Fazenda Experimental São Manuel, Faculdade de Ciências Agronômicas, Campus de Botucatu, UNESP. The soil was prepared as usual, and cassava stem segments were treated with PGR and copper sulfate 20 g/l, planted with density 1,0 x 0,5. The treatments were: 1) IBA 100 mg.L-1; 2) 2,4-D 50 mg.L-1; 3) GA3 50 mg.L-1; 4( Kinetin 50 mg.L-1; 5) SADH 50 mg.L.-1; 6) CEPA 50 mg.L-1; 7) CCC 50 ml/l; 8) Water. The dry-weight percentage, amido percentage, soluble carbohydrate content (mg/g od dry-matter - DM), nitrogen content (% DM), ohosphorus content (% DM), potassium content (% DM), calcium content (% DM), magnesium content (% DM), sulfur content (% DM), boron content (ppm), copper content (ppm), iron content (ppm), Mn content (ppm) and zinc content (ppm) were measured. The plant-growth regulator application, under the conditions of the experiment, did not increase the quality of Manihot esculenta. Application of 2,4-D resulted in higher accumulation of phosphorus and magnesium, and application of CCC increased dry-matter percentage and amido percentage.