Desempenho do rabaneteiro em recipiente com adubo de liberação controlada

Abstract

The radish is a short-cycle, small-sized vegetable, which enables the grower to deploy different forms of cultivation in small areas. For the production of quality tubers, it is necessary that the mineral nutrients essential for plant growth be made available in a controlled manner and in adequate concentrations throughout the production cycle. The objective of this work was to evaluate different doses of controlled release fertilizer (CRF) in radish production and physiology in a protected environment. The research was carried out at the Didatic Garden of the Federal University of Ceará. A randomized block design with six treatments and four replications was used. The treatments consisted of doses of CRF: 0,0; 5.0; 10.0; 15.0; 20.0; 25.0 g L-1. Leaf number, shoot length, fresh and dry mass of shoot, leaf area, chlorophyll 'a' and 'b', length and diameter, fresh and dry mass of the tubers, and gas exchange. There was a significant response for all variables evaluated. The use of CRF doses provided positive effects on radish production and phenology. Different doses provided the most expressive values for each analyzed variable, and in general, all were observed between the doses of 13,85 and 23,64 g L-1. The range of 15 to 17g L-1 of CRF was the one that allowed to obtain the highest values for the production and physiological parameters of radish plants. Although the results indicate an optimum dose range to be used for the radish cultivation, the diameter of tubers below the commercial standard makes it necessary to carry out further studies with CRF in the radish culture in containers with the purpose of obtaining the tubes that meet at least the minimum standard of commercialization in the market.