Características agronômicas de genótipos de Cebola em clima Tropical de baixa altitude

Abstract

The state of Tocantins, even with low altitude, can produce short-cycle onions, due to the tropical climate. The objective of this work was to select hybrids with potential for cultivation in a region of tropical climate and low altitude in the state of Tocantins. The experiment was carried out in the experimental area of the Federal University of Tocantins, in Gurupi, Tocantins, in the year 2019. Twelve hybrids were evaluated, ten composed of yellowishcolored bulbs: NUN 1504, NUN 1502, NUN 1205, Cimarron, Don Victor , Dulciana, Serengeti, Serena, Optima and Rebecca, and two hybrids with purple colored bulbs: NUN 3010 and Mata Hari. The experimental design used was randomized blocks, with three replications and the agronomic characteristics evaluated were: Cycle (days), diameter (mm), length (mm), classification of bulbs by diameter, shape (mm) of bulbs, average mass (grams) and productivity (t ha-1) of the bulbs. The results obtained were subjected to analysis of variance and the means were compared using the Scott-knott test at 5% probability. Significant differences were observed between the twelve hybrids studied. The results allow us to affirm that even in low altitude conditions, the state of Tocantins has the potential to produce onion with an early cycle. The Tocantins region with a tropical climate and low altitude provide the good development of onion hybrids of early cycle. The genotypes NUN 1504, Don Victor and Serengeti with average yields of 67.56 t ha-1, 64.11 t ha-1 and 70.00 t ha-1 combine high yields and good classification of the bulbs and can be indicated for cultivation in the state of Tocantins. The hybrids NUN 1504, NUN 1205 and NUN 1502 had an earlier cycle of 78, 80 and 85 days.