POTASSIUM FERTILIZATION FOR OPTIMIZATION OF ONION PRODUCTION

Authors

  • Saulo de Tárcio Marrocos Department of Agricultural, Instituto Federal de Educação, Ciência e Tecnologia do Amapá, Macapá, AM
  • Leilson Costa Grangeiro Agricultural Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Valdívia de Fátima Lima de Sousa Agricultural Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Rayanne Maria Paula Ribeiro Agricultural Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Carlos Jardel Cordeiro Agricultural Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN

DOI:

https://doi.org/10.1590/1983-21252018v31n214rc

Keywords:

Allium cepa L.. Planting period. Productivity.

Abstract

Information about the response of onion to different potassium doses may contribute to optimizing the use of fertilizers and, consequently, make the activity more profitable and environmentally sustainable. In this context, the aim of this study was to evaluate the effects of doses of potassium on onion yields. Two field experiments were carried out in the periods of September to December 2012 and April to July 2013. The experimental design used was completely randomized blocks with four replications. The treatments corresponded to the potassium doses (0, 36, 72, 108, 144 and 180 kg ha-1 of K2O). Potassium fertilization promoted an increase in the content of K in the leaf, commercial and total yield, with the maximum obtained in the dose of 180 kg ha-1 of K2O. The maximum overall and commercial yields were respectively 54.69 and 54.12 t ha-1 in the experiment of September to December 2012 and 47.39 and 46.39 t ha-1 in that of April to July 2013.

Downloads

Published

06-04-2018

Issue

Section

Agronomy