Oil and protein content in the grain of soybean cultivars at different sowing seasons

Abstract

The objective of this work was to evaluate the oil and protein contents of soybean cultivars at different sowing times in Tocantins. Four trials of sowing season were carried out, being two (first sowing season on 03/11 and second sowing season on 17/12) at Fazenda Serra Azul, in Porto Nacional - TO, Brazil, and two (first sowing season at 15/11 and second sowing season on 05/12) at the Fazenda Mariana in Santa Rosa - TO, Brazil, in two agricultural years 2014/15 and 2015/16. The experimental design was a randomized block design with three replications and seven treatments, with seven commercial cultivars. The sowing time, year and location were also evaluated, and in a factorial way. The chemical analyzes were carried out: oil and protein content and finally their respective yields. The concentrations of oil and protein varied according to the different sowing times. The cultivar 8579RSF IPRO presented the best averages for the oil content at all times of sowing. The cultivar 8579RSF IPRO presented the best means for the oil yield in the first sowing season in Porto Nacional and Santa Rosa. Only the cultivar M9144 RR presented the best averages for protein content in all sowing seasons. The cultivars 8579RSF IPRO, M8644 IPRO and M9144 RR presented the best means for protein yield for second sowing season in Porto Nacional and Santa Rosa.