Abstract
ABSTRACT Onion is considered the third most important vegetable in terms of economic value in Brazilian horticulture. The factors of production which most limit the productivity of the species are water and nutrients; so, irrigation and soil fertility control are determinant criteria for crop success. The aim of this study was to evaluate the influence of different water depths and nitrogen doses on the productivity of onion, Aquarius hybrid. Five water depths [(0, 75, 100, 125 and 150% of crop evapotranspiration (ETc)] and five nitrogen doses (0, 120, 180, 240 and 300 kg ha-1, urea form), arranged in a scheme of subdivided plots, in a completely randomized design with four replicates. We used sprinkler irrigation system. Irrigation management and water depths were estimated using Irrigameter. Plants were harvested when more than 60% of them completed the vegetative period. The water depth corresponding to 150% of the crop evapotranspiration provided higher total and commercial onion productivities, applying doses of 226.8 and 229.8 kg ha-1 of nitrogen, respectively.
Highlights
A cebola é considerada a terceira hortaliça mais importante em termos de valor econômico na horticultura brasileira
In this study we aimed to evaluate the influence of different irrigation water depths and doses of nitrogen related to onion plant production
Five irrigation levels were used based on the crop evapotranspiration (0, 75, 100, 125 and 150% of evapotranspiração da cultura (ETc), corresponding to the total irrigation water depths during the crop cycle of 0; 225; 300; 375; and 450 mm, respectively) and five nitrogen doses (0, 120, 180, 240 and 300 kg ha-1), using urea as source
Summary
A cebola é considerada a terceira hortaliça mais importante em termos de valor econômico na horticultura brasileira. O objetivo neste trabalho foi avaliar a influência de diferentes lâminas de água e doses de nitrogênio sobre a produtividade da cebola, híbrido Aquarius. A lâmina de água correspondente a 150% da evapotranspiração da cultura proporcionou maiores produtividades total e comercial da cebola, aplicando-se doses de 226,8 e 229,8 kg ha-1 de nitrogênio, respectivamente. Among the practices to maximize the onion production, irrigation is the most used in order to make water available for the crop, according to its physiological necessities. Despite the dependence of the onion crop on irrigation, little information about actual water requirements, which allows to promote higher yields, can be found (Oliveira et al, 2013). Fertilization is another practice which should be used for growing onion plants This practice must be executed properly in order to meet the nutritional demand of the crop, though. Determining the apropriate fertilization dose is very important since many losses
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