Produtividade e teor de óleo para genótipos de soja em três épocas de semeadura

Abstract

Sowing date is one of the factors that most affect soybean (Glycine max (L.) Merrill) performance due to changes in climate variables to which the culture is very sensitive. This study evaluated the effect of three sowing dates on soybean genotypes yield and oil contents, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU- 8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. The parameters evaluated were: flower color, number of days for flowering (NDF), plant height at flowering (APF), plant height at maturation (APM), stand, leaf retention (RF), lodging (ACM), height of first pod insertion (AIPV), rust severity (SF), weight of 100 beans (PCG) and yield. The oil contents was evaluated only in genotypes Impacta, Guarani, Riqueza, Milionária, Xavante, Conquista and Garantia. The parameters evaluated were SF, PCG, oil contents, yield and oil yield. Sowing in December gave the lowest bean yield. The genotypes Milionária, UFU-6, UFU-7 and UFU-8 had the greatest yield. The cultivars Guarani, Milionária and Xavante, were the most promising genotypes for oil yield. CHAPTER 3: The performance of soybean (Glycine max (L.) Merrill) genotypes subjected to different sowing dates can have great changes due to the major effect of climatic conditions on the culture. This study evaluated the agricultural performance of different soybean genotypes in three sowing dates, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU6, UFU-7, UFU-8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. The parameters evaluated were: flower color, number of days for flowering (NDF), plant height at flowering (APF), plant height at maturation (APM), stand, leaf retention (RF), lodging (ACM), height of first pod insertion (AIPV), rust severity (SF), weight of 100 beans (PCG) and yield. Sowing in December gave the lowest bean yield. The genotypes Milionária, UFU-6, UFU-7 and UFU-8 had the greatest yield. CHAPTER 4: The performance of soybean (Glycine max (L.) Merrill) genotypes subjected to different sowing dates can have great changes due to the major effect of climatic conditions on the culture. This study evaluated the effect of three sowing dates on the oil contents of different soybean genotypes, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU-8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. Theparameters evaluated were: rust severity (SF), weight of 100 beans (PCG) oil contents, yield and oil yield. Sowing in December gave the lowest oil yield. The cultivars Guarani, Milionária and Xavante, were the most promising genotypes for acceptable oil yield per area.