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Perazzo, Alexandre Fernandes; Santos, Edson Mauro; Pinho, Ricardo Ma; Campos, Fleming Sena; Ramos, Joao Paulo de Farias; de Aquino, Marina Montenegro; Silva, Thiago Carvalho da; Bezerra, Higor Fabio Carvalho
Ciência rural, 10/2013, Volume: 43, Issue: 10Journal Article
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 Pendencia, municipality of Soledade-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.sup.-1 mm.sup.-1. The genotypes showed high use efficiency of rain can and productivity, which is recommended by the IPA 1011 increased participation panicle. Key words: dry matter, forage, plant height, precipitation. Objetivou-se quantificar o rendimento forrageiro, o percentual de componentes da planta, as caracteristicas morfometricas e a eficiencia do uso da chuva de cinco genotipos de sorgo para silagem no semiarido paraibano. O experimento foi conduzido na Estacao Experimental Pendencia, no municipio de Soledade-PB. O delineamento experimental utilizado foi em blocos casualizados, com quatro repeticoes, sendo os tratamentos experimentais representados por cinco genotipos de sorgo: Ponta Negra, SF 15 IPA 1011, IPA 2502 e IPA 46742. Nao foram observadas diferencas entre os genotipos para a producao de materia natural e producao de materia seca e para o percentual de lamina foliar. Entretanto, para o percentual de colmo foram observados maiores valores (P<0,05) para os genotipos Ponta Negra e IPA 46742. O percentual de panicula foi superior (P<0,05) para as cultivares 'IPA 1011 'e 'IPA 2502'. As cultivares 'IPA 1011 ' e 'IPA 2502' apresentaram percentual de panicula acima de 38% da MS. Nao houve diferenca (P<0,05) para eficiencia no uso da agua de chuva entre os genotipos estudados, com valores variando de 94,37 a 126,25kg de MS ha.sup.-1 mm.sup.- 1. Os genotipos avaliados apresentam elevada eficiencia no uso da chuva e produtividade. Recomenda-se o IPA 1011 pela maior participacao de panicula. Palavras-chave: altura daplanta, forragem, materia seca, precipitacao.
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