Abstract

ANGEL S, Diego Iván  and  MENJIVAR FLORES, Juan Carlos. Changes in fractions of phosphorus in Inceptisols and Mollisols for applications of vinasse and /or potassium chloride. Acta Agron. [online]. 2010, vol.59, n.3, pp.356-362. ISSN 0120-2812.

In order to determine the effect that the vinasse application has on P fractions and their relationship to the accumulation of total biomass in sweet corn, a greenhouse experiment was performed with soils from the municipalities of Florida (Inceptisol Typic Argiudoll with intrusions Entic Dystropept) and Palmira (Mollisol Fluventic Haplustoll) in Valle del Cauca, Colombia. A completely randomized design with four treatments and five replications was used. The treatments were applied trying to supply the potassium requirements of growing corn and separated into two periods: 15 days after sowing and, before crop flowering. The evaluation of phosphorus fractions was performed at the beginning and end of the test, as in the time of vinasse application. The application of T1 (KCl 100%) in the Florida soil showed positive effects on the inorganic fraction of available and moderately available P. The T2 (100% vinasse) had no effect on phosphorus fractions. Inorganic and organic fractions of available and moderately available P increased, as did applying T2 (100% Vinasse) in Mollisol. For both soils these same fractions showed high levels and significant difference between sampling indicating an adequate supply at the time of this nutrient, which is beneficial for short-cycle crops. Regarding the accumulation of biomass on sweet corn, T1 and T2 were the treatments that had higher values in Inceptisol without showing significant differences between them indicating that Vinasse can completely replace KCl. In Mollisol, T1 and T4 had the highest values of total biomass accumulation, showing that it is possible to replace 75% of synthetic fertilizer by Vinasse because did not statistics differ between them.

Keywords : Vinasse; soil amendments; potassium; phosphorus; sweet corn; Inceptisol; Mollisol; Valle del Cauca; Colombia.

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