GERMINAÇÃO E VIGOR DE SEMENTES DE SOJA TRATADAS COM FERTILIZANTES À BASE DE COBALTO, MOLIBDÊNIO E EXTRATO DE ALGAS

Abstract

The adoption of high quality seeds represents a fundamental management practice for the adequate establishment of soybean crops in the field. Additionally, the use of appropriate techniques in the different crop production systems is an essential factor in obtaining greater productivity. From this perspective, there is currently an increasing use of new products to incorporate additives into seeds, especially micronutrients, aiming to improve their productive potential. However, there is little information regarding the effect of these products on the physiological performance of seeds and the initial growth of seedlings. Thus, the objective was to evaluate the germination and vigor of soybean seeds, cultivar Brasmax Olimpo IPRO, subjected to treatment with commercial fertilizer based on cobalt, molybdenum and algae extract. The experimental design adopted was completely randomized (DIC), with four treatments, consisting of fertilizer doses (0.0; 2.0; 4.0 and 6.0 ml kg-1 of seeds), and four replications of 50 seeds for each. The following tests and determinations were carried out to evaluate the physiological quality of the seeds: germination, cold test, electrical conductivity, seedling emergence, emergence speed index (ESI) and length and dry mass of aerial and root parts of seedlings. The treatment of soybean seeds with fertilizer did not have a significant influence on their germination performance, however, at the highest dose tested (6.0 mL kg-1 of seeds), the germination of seeds subjected to the cold test was negatively affected. Furthermore, although the application of the fertilizer provided an increase in the speed of seedling emergence at doses of 2.0 and 4.0 ml kg-1 of seeds, it promoted negative effects on the root growth of the seedlings, regardless of the dose applied. As for dry mass, at all doses applied, and the length of the aerial part of seedlings, at doses of 4.0 and 6.0 ml kg-1, the responses obtained were similar to those of the control.