The objective was to quantify the forage yield, percentage of plant components, the morphometric characteristics and the rain use efficiency of five genotypes of sorghum silage in semiarid of Paraiba. The experiment was conducted at the Experimental Station Pendência, municipality ofSoledade-PB. The experimental design used was randomizedblocks with four replicates, being experimental treatments represented by five sorghum genotypes: Ponta Negra, SF 15 IPA 1011, IPA 2502 and IPA 46742. No differences had been observed between genotypes for the production of natural matter and dry matter production. For the percentage of leaf blade was not significant difference (P>0.05), however for the percentage of stem showed higher (P<0.05) for genotypes Ponta Negra and IPA 46742. The percentage of panicle was high (P<0.05) for cultivars 'IPA 1011' and 'IPA 2502'. The cultivars 'IPA 1011' e 'IPA 2502' showed panicle percentage above 38% DM. There was no difference (P<0.05) in rain-use efficiency among genotypes, with values ranging from 94.37 to 126.25kg DM ha-1 mm-1. The genotypes showed high use efficiency of rain can and productivity, which is recommended by the IPA 1011 increased participation panicle.
dry matter; forage; plant height; precipitation
