PRODUTIVIDADE DO REPOLHO IRRIGADO SUBMETIDO A DIFERENTES FONTES E DOSES DE BORO

Abstract

The objective of this study was to evaluate the agronomic performance and yield of the cabbage crop submitted to different boron sources and doses. The work was conducted at the Água Verde Farm, located in Nova Glória-GO, under central pivot irrigation. The soil preparation was with a deep subsoiling and a leveling. Basic fertilization with 48 kg N, 360 kg P2O5 and 120 kg K2O ha-1 . Seedling transplantation occurred on 06/22/2019. At 20 days after transplanting, fertilization with 200 kg ha-1 of N and 200 ha1 of K2O was applied. The statistical design was randomized blocks in a 4x5 factorial scheme, four sources of boron (boric acid, borax, ulexite and sulforgan) and five doses of boron (0, 0.5, 1, 2, 3 kg.ha-1 ), with four repetitions. Each experimental plot consisted of four lines of five meters in length. For evaluation, the two central lines were considered, with 0.5 m at each end being neglected. The variables analyzed were: plant height, longitudinal diameter, transverse diameter, number of external leaves and yield in kg.ha-1 . There was no significant difference between the different sources of boron used. For the different doses of boron applied, only the leaf number variable did not obtain a significant regression. The application of boron at 1.8 kg ha-1 yielded the maximum production of cabbage heads, totaling a productivity of 82.58 ton ha-1 .