ASSESSING THE IMPACT OF RICE BLAST (Oryza sativa L.) LAND HIGH UNDER CULTIVATION WITH DIFFERENT STRENGTHS OF AGROSILÍCIO AND ROTATION OF CULTURE WITH SOYBEAN (Glycine max (L.) Merrill) IN SYSTEM TILLAGE

Abstract

ABSTRACT: Brazil is the eighth largest producer of rice. In Maranhão, rice is intercropped with other crops, especially beans and corn, with rare isolated cultivation. The rice crop is affected by several factors, fungal diseases are major responsible for the loss of productivity. However, the agrosilício (calcium silicate, magnesium and silicon) is being tested in several experiments, the silicon increases the resistance of the plant. This study aimed to analyze the response of the plant to agrosilício, considering the incidence of diseases and establish the most efficient dose of calcium silicate and magnesium to compose the integrated management of rice diseases in the state of Maranhão. The experiment was installed in the premises of the Exhibition Park of Imperatriz-MA, belonging to the Rural Union Imperatriz, situated at BR 010, in a cultivated area in the previous year with soybean (Glycine max (L.) Merrill). In randomized block split plot with four replications, the five treatments are composed of the silicon doses (0, 1, 2, 4, 8 t / ha calcium silicate and magnesium - Agrosilício). According to the data of the statistical analysis there weren’t no significant difference between any dose of silicon applied to the control of the diseases: leaf blast, panicle blast, being necessary to conduct further experiments to indicate the best agrosilício dosage to be applied to the soil to reduce rice diseases.   Key Words: Rice culture, fungi and silicon fertilization.