Fontes de zinco no tratamento de sementes em arroz irrigado

Abstract

Zinc (Zn) is a micronutrient for rice cultivation by participating in various biochemical pathways and structuring the cell wall. Given the small amounts demanded by the cultures and the uniform distribution of difficulties in farming, justified the treatment of seeds. The experiment was carried out based on a randomized block design with factorial 3 x 2 with four replications. The experiment was conducted at the Experimental Station of IRGA, in Itaqui Rural Syndicate in an area with soil of Plinthosol class. The objective of this study was to evaluate the treatment of seeds with two sources of Zn, one in oxide form and another in the form of sulfate in three cultivars of flooded rice in relation to crop yield, number of panicles, number of grains per panicle and thousand kernel weight. They used the rice cultivars QM 1010 and prime and BR-Irga 424. The treatments consisted of zinc in the oxide form, in the form of sulfate and the control treatment that did not receive zinc. The two sources of zinc correspond to commercial products recommended for use in rice cultivation. Seed treatment was done minutes before sowing according to the manufacturer's recommendation. We evaluated yield components, panicle number per area, per hectare yield, number of grains per panicle (full and failed) and 1000 grain weight. There was no significant difference in grain yield between the witness and the two sources of Zn, however there was a trend of increased production due to the use of Zn by two sources, and zinc as sulphate presented increments larger than the Zinc oxide form. The hybrid QM 1010 showed grain yield, number of filled grains, thousand grain weight and number of grains failed significantly higher than the other cultivars.