Consórcio de mamona com feijão-caupi e gergelim no semiárido paraibano.

Abstract

The intercropped represent option to increase the land equivalent ratio (L.E.R.) and diversify production. The purpose of this study was evaluate the two cantor bean cultivars, in regime single ones and intercropped with sesame and cowpea in Pombal - PB. The experiment was conducted from March to November 2011 under rainfed conditions at the site of Monte Alegre low in loamy sand soil. The experimental design was a randomized block design in a 2 x 3 + 2, 2 castor bean cultivars (IAC 2028 and BRS Nordestina), 3 cropping systems (monoculture and intercropped with beans - cowpea or sesame) plus 2 additional treatments (bean - in monoculture cowpea and sesame) with 4 replications. In castor bean were evaluated the following characteristics: plant height, stem diameter, number of internodes, insertion height of the primary raceme, number of racemes per plant, length of racemel mass of cluster, number of fruits per cluster, grain yield per plant, production potential, percentage threshing, the relative share of the orders of racemes and correlation coefficient. In cultures of cowpea and sesame were collected productivity data which were used for evaluation and determination of L.E.R us intercropping systems. The results, found that the IAC 2028 produced more no. fruit/raceme, being these of greatest mass in relation to BRS Nordestina, which resulted in higher productivity, 826 kg ha'l. By calculating the L.E.R. the BRS Nordestina have an adaptation to the intercrop, especially with cowpea, where there were 46% of advantage in relation to single ones. In the intercrop cultivars of mid cycle have been prioritized with partners of the low size, and single ones early cultivars and short cycle are recommended.