Production andqualityof hybrids of broccoli type unique inflorescence cultivated under different shading screens intropical climate

The objective of this work was to evaluate the agronomic performance of broccoli cultivars cultivated underfour environmentsunder high temperature conditions in Nova Mutum- MT.The experiment was carried out from March to August 2015. The experimental design used was that of randomized blocks arranged in a 4 x 2 factorial scheme, with four replications.being evaluated two cultivars of single inflorescence of the type of broccoli, Imperial (Sakata®) and Salinas (TopSeed®), cultivated in three screened environments covered with shading screen - black, silver andred, all with 50% shadingand Without Cover. During the experiment the near, average and minimum temperatureswere 32.8ºC,17.6ºC and 19.3ºC, respectively. Both cultivars showed good agronomic performance for this climatic condition, but the Imperial hybrid obtained better results in relation to inflorescence production. The use ofshadingscreen s proved to be feasible in reducing temperature in cultivation environments, however the reduction of solar radiation delayed the emission of inflorescence, prolonging its vegetative stage. The Without Cover environment provided higher production and better inflorescence quality. The Imperial cultivar showed better performance under high temperature conditions.