Effect of edaphoclimatic changes in South-Central region of the state of Tocantins on grain yield of soybean cultivars

Joênes Mucci Peluzio, Aurélio Vaz-de-Melo, Gustavo André Colombo, Flávio Sérgio Afférri, Rubens Ribeiro Silva, Glauber Ronery dos Santos Ribeiro, Luíz Paulo Miranda Pires

Abstract


The objective was to evaluate the influence of different times and seeding rates on soybean (Glycine max (L.) Merrill.) grain yield in the Central-Southern region of the state of Tocantins. Four trials were installed in the agricultural year 2008/09. The experimental design was randomized blocks with three replications and 36 treatments. The treatments were arranged in a factorial 3 x 3 x 2 x 2, consisting of three cultivars (M-SOY 9144 RR, M-SOY 8867 RR and P98Y70), three seeding rates (6, 10 and 14 plants per meter), and two sowing dates in each of the two municipalities. The first sowing date in Gurupi was December 3 and the second December 18, 2008. In Palmas, the first season was on 31 November and the second on 16 December 2008. The variables evaluated were plant height and insertion of first pod, a hundred seed weight and grain yield. It can be observed that with the delay of sowing date it reduces the grain yield, but the increase of density of planting is dependent on the cultivar and the evaluated characteristics are dependent on the season and the municipality of planting. Palmas offers to the cultivars the highest mean grain yield and to Gurupi the best development of soybean plant.


Keywords


Glycine max; climate changes; soil fertility



DOI: https://doi.org/10.5777/paet.v3i1.620