Plasticity on 'BRS 8381' Glycine max (L.) Merril Agronomic Attributes in Different Years of Cultivation in Roraima

Abstract

Soy has high plasticity, which expands its capacity to adapt to different environmental and management conditions, through morphological changes in production components. Thus, the objective was to evaluate the effects of different densities of soybean cultivar BRS 8381 on agronomic characteristics. The experiment was implemented and conducted in a Cerrado area, in the Agua Boa of Embrapa Roraima experimental field. A randomized block design was used in a 2*4 factorial scheme, with four replications. The treatments consisted of two years of soybean cultivation (2015 and 2016), sown in four plant densities (10, 14, 18 and 22 plants per linear meter). Agronomic characteristics were evaluated: plant height; height of insertion of the first pod; stem diameter; number of nodes on the stem; number of pods per plant; number of branches per plant; dry mass of the plant; harvest index and grain yield. The highest average productivity of 'BRS 8381' soybeans in the Cerrado area of Roraima is obtained with a population of 387.448 plants per hectare. 'BRS 8381' plants at density 22 plants m -1 linear are not suitable for the Cerrado conditions of Roraima. The cv. BRS 8381 is influenced by rainfall and temperature factors in the Cerrado conditions of Roraima.

Sequential plantations of rice, edamame soybeans, and peanuts as a product of alternative and mineral fertilization in the Roraima Cerrado in Brazil

“…As well as the results gathered in this paper, other studies have also confirmed that alternative and mineral fertilization induce superiority in the agronomic attributes of several oilseeds and annual crops in successive plantations (Smiderle et al, 2020). This type of fertilization is described as effective in the field because it induces efficiency in physiological processes that promote rapid initial growth of plants (Krenchinsk et al, 2018).…”

“…The irrigation was executed by sprinklers, in order to keep the soil moist, when necessary. The treatments related to the control of pests, diseases, and spontaneous plants for soybean crops in the Roraima Cerrado were performed according to the recommendations of Smiderle et al (2020).…”

“…The state of São Paulo concentrates more than 90 % of the national peanut production. In contrast, in northern Brazil, especially in the state of Roraima, research on peanut production is still scarce (Smiderle et al, 2020).…”