Densidade de plantio e adubação para cebola em sistema de produção orgânico

Abstract

Considering the horticulture sector, the production of onion is a traditional activity among farmers in the south of Rio Grande do Sul. In order to become viable options that provide for produces the independence of chemical inputs, the obtainment of a better productivity, according to the standards of quality and the reduction of socioeconomic and ecological costs, the present study aimed to evaluate the influence of fertilizer levels and plant population on the productivity and quality of onion bulbs using the cultivate Bola Precoce‟. Moreover, this paper aims to provide subsidy to farmers in the south of Rio Grande do Sul for the adoption of the Organic Onion Production System. The study was conducted in two distinct areas of Capão do Leão. The production of seedlings was conducted in the high tunnel system called Floating‟. The experiment consisted of a factorial AXB in a completely randomized design with four repetitions. The experimental factors were: population density of plants: with 4 levels: 33.3 plantsm-2, 40.0 plantsm-2, 50.0 plantsm-2, 66.6 plantsm-2; fertilization with bovine vermicompost in 3 levels as follows: recommended dose by the manual of fertilizing and liming to the states of RS and SC; one and a half times the recommended dose; twice the recommended dose. Agronomic evaluations were performed in stages of pre-cure (1 day after harvest) and post-cure (40 days after harvest) of variables related to bulb diameter (mm), categories in onion quality (%), bulb weight (g), total bulb (kgm-2). It was observed that: the levels of organic fertilization did not influence the productivity of onion bulbs, the increase in plant population did not interfere in the classification concerning to bulbs diameter (mm), the population density of 66.6 plants plantsm-2 provided greater productivity in Kg.m-2.