Recipientes e doses de adubo de liberação controlada na produção de rabanete em ambiente protegido

Abstract

The cultivation of the radish has aroused interest on the part of the agricultural producers, however it is still necessary the development and improvement of management practices that allow higher production and quality of the bulbs. Currently, research results have shown that the development, of the complete cycle of the plants inside containers of different volumes filled with substrate is feasible. These results make it possible to evaluate the combination of the use of these containers with substrates enriched with controlled release fertilizers. In this sense, the objective of this work was to evaluate the use of containers of different volumes filled with substrate enriched with increasing doses of controlled release fertilizer (CRF) in the growth and production of radish in protected environment of screened type. The research was carried out at the Didátic Garden of the Federal University of Ceará, from September to October 2017. The experimental design was a randomized complete block design with three replications. The plots consisted of container volumes (31 and 100 cm3 cells-1) and subplots by ALC doses (0, 4, 8, 12 kg.m-3 or g.L-1). Leaf number, shoot height, fresh and dry mass of shoot, leaf area, 'a' and 'b' chlorophyll, length and diameter of the bulb, fresh and dry mass of the bulb and total production by area . Plants grown in a 100 cm3 container had the highest values for all variables and the increasing CRF doses resulted in an increase in radish growth and yield. It is concluded with this work that containers of larger volume (100 cm3) combined with the highest dose of CRF (12 kg.m3), are those that allowed to obtain the highest agronomic values and production of radish in protected cultivation.