Agronomic efficiency of organomineral fertilizer in onion cultivation

Resumo

Onions has high nutritional and nutraceutical value. In the last decade the bulbs have gained increasing
relevance due their compounds linked to anti-cancer effects. The fertilization managment is relevant to this
crop because the mineral’s influence beyond productivity, interfering in several aspects of quality. Organic
sources despite available, adoption is still cautious and seen as an expense, rather than investment in soil
quality. Therefore, the objective was to evaluate the use of organomineral fertilizer on the development and
productivity of Akamaru hybrid. The experiment was carried out in Cristalina-GO, in a randomized block design,
with 4 replications and 5 treatments: organomineral fertilizer (NPK) with the formula 02-20-05. The rates were
adjusted to approximately the same amounts, where 3,680 kg ha^-1 was considered the 100% rate, 2,944 kg ha^-1
as 80%, 2,208 kg ha^-1 as 60% and 1,472 kg ha^-1 as 40% of the rate established. The rate of 2,300 kg ha^-1 of the
formulated 03-35-06 referred to 100% of the mineral source. The total yield of onion was not affected when the
organomineral source was used, therefore, it is a viable source for use in onion culture. A rate reduction of up
to 20% of the recommended mineral rate allows good performance (85.5 t ha^-1), with 7.5 t ha^-1 higher than the
60% reduction of the recommended rate.