DOSES DE FÓSFORO EM SORGO GRANÍFERO EM CONDIÇÃO DE CAMPO NO SUDOESTE GOIANO

Abstract

Alcantara, Ritiane Souza. Phosphorus doses in grain sorghum under field conditions in Southwest Goiás. Nº 23 Monograph (Agronomy Course). Federal Institute of Education, Science and Technology Goiano – Campus Rio Verde, Rio Verde, GO, 2020.

Sorghum (Sorghum bicolor) is an annual plant with higher dry matter production than maize, especially in marginal cultivation conditions, such as in low fertility soils and places where the occurrence of dry spells is frequent. The work evaluated the effect of phosphorus application on grain sorghum crop under field conditions in Southwest Goiás. The experiment was implemented in the municipality of Jataí-GO on Fazenda Pântano, whose Latitude is 17°59'15.87” S and Longitude 5°14'15.26” W. Soil and foliar analyzes were performed at the Analysis Laboratory of leaf tissue and soil of the Federal Institute – Campus Rio Verde. The sorghum cultivar AG 1085 was used. The experiment included 5 treatments, with the doses 0, 40, 80, 120 and 160 kg ha-1 of P2O5 with 5 replications, the applications were made manually, and the doses were previously weighed on an analytical balance in the laboratory. The parameters observed were leaf area, stem length, stem diameter, fertilization efficiency, shoot dry mass and leaf phosphorus content. The leaf area showed a quadratic effect, with the maximum point being 114 kg ha-1. Stem length and diameter showed a quadratic effect, with the maximum point being 106 kg ha-1 and 77 kg ha-1, respectively. As for the fertilization efficiency, the answer was quadratic with a maximum point of 84 kg ha-1. The shoot dry mass showed a linear effect, with the highest average being observed at the dose of 160 kg ha-1. Leaf phosphorus content showed a quadratic effect, with a maximum point of 142 kg ha-1. It is concluded that the addition of phosphorus doses significantly influenced most of the variables evaluated in this work. The ideal dose recommended for this work, taking into account the productive and economic potential, was 90 kg ha-1 of P2O5, there was a slight decrease in most parameters observed at the dose of 160 kg ha-1.