Determinação da configuração de plantio de dois genótipos precoces de mamona.

Abstract

The appropriate spacing in planting of major crops is a technology simple to apply and that can result in a significant increase productivity. Was studied the behavior of two genotypes of castor bean planting in different configuration. The experiment was conducted in the irrigated área of São Gonçalo, in Sousa - PB. The genotypes were BRS Gabriela variety and lineage CNPAM 2009-7 under irrigated condition. Two experiments were established, one for each genotype, using a factorial design, for BRS Gabriela was 2 row spacings (1 .0 and 1 .5 m) and three planting densities (0.50, 0.75 and 1 , 0 m) and CNPAM 2009-7 was 2 row spacings (0.50 and 0.75 m) and ave plant densities (0.15, 0.30, 0.45, 0.60 and 0.75 m) respectively. There were significant differences at 5% probability by F test for some of the characters analyzed in both genotypes. In the BRS Gabriela row spacing affected the height of the stem (ALTC), stem diameter (DIAC) and income (REND) (a : 5%), the ALTC and REND were higher in the spacing of l m (45.91 cm and 2112.88 kg / ha) compared to the spacing of 1.5 m (43.98 cm and 1442.48 kg / ha) respectively. The planting density affect the variables height of the stem (ALTC) and number of racemes per plant (NRAC), the stem height was higher density employed was 0.5 m between plants, with the NRAC was higher density Im between plants. CNPAM 2009-7 to the characteristics show differences in spacing and density were to stem diameter (DIAC) and number of racemes per plant (NRAC). The spacing 0.75 of and densities 0.45, 0.60 and 0.75 m stem diameter provides greater and greater number of racemes per plant. It can be concluded for BRS Gabriela that the best spacing in these culture conditions is l m between rows and 0.5 m between plants. As for the 2009-7 CNPAM density and row spacing does not seem to affect most traits, highlight was the average yield obtained by this genotype in this experiment (3097 kg/ ha).