Desempenho agronômico do sorgo forrageiro para silagem sob diferentes doses de adubação fosfatada.

Abstract

Adequate phosphorus availability is vital for sorghum development, especially in the early vegetative stage, as it influences root system growth and efficiency. These constraints affect both biomass growth and production, directly impacting silage quality. The aim of this study is to evaluate the agronomic performance of forage sorghum for silage under different doses of phosphate fertilization. The experiment was conducted in pots at the Subhumid Tropical Institute (ITS) of the Pontifical Catholic University of Goiás, Campus II. The cultivar used was AGRI 001E Super Bolivian Sorghum intended for silage production. Phosphorus was provided by a super simple formulation (18% P2O5), and nitrogen and potassium were supplied during sowing using 20 00 20 fertilizer (20% N and 20% K2O). The experimental design was a randomized complete block design with 5 treatments and 3 replicates, totaling 15 plots. The treatments (T0, T1, T2, T3, and T4) consisted of doses of 0, 40, 60, 80, and 100 kg ha-1 of P2O5, respectively. Plant height, stem diameter, root length, and fresh and dry aerial biomass were evaluated. Results showed that the 60 kg ha-1 dose of P2O5 provided the highest means for the evaluated parameters.