PROPORÇÕES DE FERTILIZANTE MINERAL E ORGANOMINERAL NO CULTIVO DE CEBOLA

Abstract

The careful selection of sources and doses of fertilization is essential to obtain increases in productivity in onion culture. Organomineral fertilizer brings benefits to the soil and effect on crop productivity. Finding a ratio between the different fertilisers can be a promising choice for sustainable agriculture. The objective of this work was to evaluate the proportions of mineral and organomineral fertilizers in onion cultivation. The experiment was carried out in the field, in the municipality of Cristalina-GO, in a randomized block design with four replications. Five proportions of mineral fertilizer with organomineral (0% M and 100% OM; 25% M and 75% OM; 50% M and 50% OM; 75% M and 25% OM; 100% M and 0% OM) were used, plus control without fertilization (0% A). At 96 days after sowing (DAS), the growth characteristics were determined: length, width and number of leaves. The harvest was carried out at 134 DAS, when 70% of the plants were already popsted. The bulbs of each experimental plot were counted, classified and weighed to estimate productivity. For attributes of onion postharvest quality, soluble solids content, titratable acidity, and mass loss in the period of 30, 60, 90 and 120 days were evaluated. In this study there was no statistical difference in the proportions for plant growth characteristics and total productivity. The proportion of 50%M50%OM produced 76.6% of class four onion higher than the control. After 120 days storage, 10.72% of mass loss was observed and the soluble solids content was reduced by 18.4%. The use of organomineral fertilizer has brought benefits to onion production.