ADUBAÇÃO FOSFATADA NO COMPORTAMENTO PRODUTIVO DE REPOLHO (CULTIVARES AVATAR E ATLANTA) EM SISTEMA DE PLANTIO CONVECIONAL

Abstract

This study aimed to evaluate the cabbage yield behavior (Brassica oleracea) submitted to different phosphorus (P) sources, grown during two seasons in traditional tillage system. Experiment 1 was developed from May to October 2017, studying the Avatar hybrid cabbage in the traditional tillage system. Experiment 2 was developed from October 2017 to March 2018, with the Atlanta hybrid cabbage. In both experiments, the following treatments had been applied: (a) T1 - Control (no P application); (b) T2 - 100% triple super phosphate; (c) T3 - 100% Yoorin® thermophosphate; (d) T4 - 75% triple superphosphate + 25% Yoorin® thermophosphate; (e) T5 - 50% triple superphosphate + 50% Yoorin® thermophosphate; and (f) T6- 25% triple superphosphate + 75% Yoorin® thermophosphate. The experimental design of randomized blocks with six plots and four replicates was used in both experiments as well. The variables evaluated were: (a) transverse and longitudinal circumference; (b) heart length; (c) compactness; (d) number of leaves; (e) number of commercial standard heads; and (d) weight of each unit (g). Higher yields were obtained with the application of Triple Super Phosphate (TSF) and Yoorin® thermophosphate, when compared to the control in the first cycle. It is noticed that the phosphate fertilization is relevant for the cabbage yield in the west of Santa Catarina State, Brazil. In this paper, it can be concluded that the different phosphorus sources used have an effect on the cabbage yield behavior in a similar way.