Níveis de tecnologia na semeadura de arroz irrigado na fronteira oeste do Rio Grande do Sul

Abstract

The important aspect to achieve high productivity is to perform a good sowing, allowing the seedlings to emerge quickly and uniformly, occupying the available space efficiently. The objective of this work was to evaluate the influence of technological levels of sowing on the vegetative performance of irrigated rice, characterized by: T-1, seeds treated with fungicides, insecticides and micronutrients with industrial treatment (TI) and 60 kg ha-¹ of seed; T-2, seeds treated with fungicide / insecticidal protective action (Piraclostrobina), systemic (Methyl Thiophanate) and contact and ingestion (Fipronil), on farm and 100 kg ha-¹ of seed; and T-3, "white bag" seeds and no treatment. And 120 kg ha-¹ of seed, T-4, seeds treated with fungicide / insecticide of protective action (Piraclostrobina), systemic (Methyl Thiophanate) and contact and ingestion (Fipronil), on farm and 60 kg ha-¹ of seeds. The variables analyzed were emergence, number of tillers per plant, number of shoots per square meter, dry matter partition and leaf area index. The experimental design was a randomized block design with four replicates. The results were submitted to analysis of variance and Tukey test at 5% of probability. It was verified that there is no significant difference for the analyzed variables, being able to indicate low densities associated to medium and high level of technology since similar yields can be obtained with seeding densities smaller than those currently recommended, with important environmental and economic implications.