Aplicação foliar e via solo de cinza de casca de arroz no rendimento da soja

Abstract

Two researches were conducted with the objective of understanding the effect of the application of rice hull ash as a source of silicon on mineral nutrition and soybean crop protection, and evaluated some morphological aspects, yield components and the physiological quality of seeds produced in Alegrete/RS. In the first experiment, five treatments of rice hull ash (0, 75, 150, 225 and 300 kg ha-1) were applied as foliar treatments on soybean plants and in the second experiment, five treatments were used as treatments of rice bark ash (0, 5, 10, 20 and 40 thousand kg ha-1) applied and incorporated into the soil in pre-sowing. The items analyzed in both experiments were number of pods per plant, number of pods with 1, 2 and 3 seeds, number of seeds per plant, seed weight per plant, length of area per plant, root length per plant, number of nodes per plant, diameter of the stem at 2 cm, weight of one thousand seeds, productivity, germination and oil content in the seeds. Under the conditions that this research was developed, the results obtained in the two studies allowed to conclude that the rice bark ash applied via foliar or in the soil does not present effects on the evaluated parameters (morphological aspects, yield components and physiological quality of seeds) from soybean plants, except for the parameter oil content in the seeds in the experiment that evaluated the application of ash of rice husk incorporated in the soil, which presented reduction in all the doses compared to the control.