Doses crescentes de calcário dolomítico na produção de grãos de soja no Semiárido piauiense

Abstract

Soybean originated in the northeastern region of China, known as Manchuria. In Brazil, production began in the South Region and expanded to the Central-West, North, and Northeast regions. In the Northeast region, soybean exhibits the highest growth rate regarding its establishment. However, many producers overlook soil preparation, neglecting some important factors, particularly those related to soil acidity. Therefore, it is necessary to seek alternatives to mitigate the negative effects caused by soil acidity. This study aimed to evaluate the effects of different doses of dolomitic limestone on two soybean genotypes regarding development and productivity in Valença do Piauí. A randomized block design with 4 blocks and 6 treatments (0, 5 t/ha, 10 t/ha, 15 t/ha, 20 t/ha, 25 t/ha) was adopted. The limestone doses were determined based on soil analysis, followed by incorporation into the soil. After harvest, the following variables were evaluated: plant height, root length, height of the first pod, stem diameter, number of grains, number of pods, number of nodes, average grains per pod, thousand-grain weight, number of plants, and productivity. The addition of limestone to the soil resulted in better soybean development, as related to variables such as plant height (PH), stem diameter (SD, mm), number of grains (NG), number of pods (NP), number of nodes (NN), thousand-grain weight (TGW, g), number of plants (NP), and productivity (kg/ha). However, no significant differences were observed between the cultivars under the same limestone doses applied.