Avaliação de cultivares de mamoneira no Recôncavo Sul Baiano

Abstract

Castor beans (Ricinus communis L.) is a plant of euphorbiaceae with high morphophysiological complexity. Once more new cultivars are made available it is necessary to study their development and yield when submitted to different agroclimatic conditions. Therefore, the objective of the present work was to evaluate the performance of castor bean cultivars indicated by the Agricultural Company of Development in Bahia-SA – EDBA, under conditions of low altitude in the south reconcavo region of Bahia, during two consecutive years. The work was carried out at the Agricultural, Environmental and Biological Science Center (AEBSC) at the Federal University of the Reconcavo Region of Bahia (UFRB) located at 12º 40’ 19” south latitude, 39º 06’ 23” Greenwich west longitude, with altitude varying from 117 to 225 m. The experimental design was in random blocks, with five replicates. The following cultivars were evaluated in the first period: BRS 149 Nordestina, BRS 188 Paraguaçu, EBDA MPA 17, Mirante 10 and Sipeal 28. Due to high susceptibility to gray mold, the Mirante 10 cultivar was substituted, in the second period, by the EBDA MPA 18 cultivar. For each chapter specific harvesting methodologies for plant, fractions and/or data of interest regarding the analysis, were used. It was concluded that castor beans allocate their assimilates primarily in the leaves and stems and later transfer them to the bunches during maximum accumulation of plant dry matter; the greater pluviometric indice favored growth and/or development of castor bean plants. The Sipeal 28 cultivar presents greater phenotypic plasticity and the plant height characteristic assures being a good yield indicator of castor bean cultivars in low altitudes in the south reconcavo region of Bahia.