Morphogenetic and structural characteristics of guinea grass pastures submitted to three frequencies and two defoliation severities.

It was evaluated the morphogenic and structural characteristics of guinea grass under rotational at three grazing intervals and two defoliation intensities. Grazing intervals corresponded to the time needed by the forage canopy to reach 90, 95 or 100% of incident light interception during regrowth and they were evaluated combined to two defoliation severities (post-grazing conditions, 25 and 50 cm of height), being allocated to experimental units according to a complete randomized design, with three replicates and 3 × 2 factorial arrangement. The experiment was conducted from July 2003 to May 2004. For evaluation of morphogenetic and structural characteristics, ten tillers per experimental unit were selected. Morphogenetic and structural characteristics were strongly influenced by seasons of the year inasmuch as leaf elongation rate increased 3.5 fold from winter to summer. In addition to year season effect, there was also an effect of defoliation frequencies on tiller population density, which was greater in the defoliation period corresponding to 90% of light interception, especially if evaluated in relation to the interval corresponding to 100% of light interception. Defoliation frequency is determinant in expression of phenotypic plasticit, acting on the control of stem elongation

Morphogenetic and structural characteristics of guinea grass pastures submitted to three frequencies and two defoliation severities.

It was evaluated the morphogenic and structural characteristics of guinea grass under rotational at three grazing intervals and two defoliation intensities. Grazing intervals corresponded to the time needed by the forage canopy to reach 90, 95 or 100% of incident light interception during regrowth and they were evaluated combined to two defoliation severities (post-grazing conditions, 25 and 50 cm of height), being allocated to experimental units according to a complete randomized design, with three replicates and 3 × 2 factorial arrangement. The experiment was conducted from July 2003 to May 2004. For evaluation of morphogenetic and structural characteristics, ten tillers per experimental unit were selected. Morphogenetic and structural characteristics were strongly influenced by seasons of the year inasmuch as leaf elongation rate increased 3.5 fold from winter to summer. In addition to year season effect, there was also an effect of defoliation frequencies on tiller population density, which was greater in the defoliation period corresponding to 90% of light interception, especially if evaluated in relation to the interval corresponding to 100% of light interception. Defoliation frequency is determinant in expression of phenotypic plasticit, acting on the control of stem elongation

Ensaio de competição entre cultivares de sorgo granífero para região sudeste de Minas Gerais.

O sorgo granífero é uma das culturas que vêm apresentando significativo aumento de produtividade e área plantada no Brasil, por isso surge à importância de melhores cultivares para o mercado. O trabalho teve o objetivo de avaliar a produtividade de grãos de 25 híbridos de sorgo granífero, sendo 22 provenientes do programa de melhoramento genético da Embrapa Milho e Sorgo e três cultivares comerciais, em um experimento no delineamento em blocos ao acaso com três repetições, avaliados na Estação Experimental da Embrapa Milho e Sorgo em Sete Lagoas/MG. Para a avaliação estatística, foi realizada a análise de variância e teste F no programa Genes, e para a realização de agrupamento de médias, foi realizado o teste de Scott & Knott (1974). De acordo com as avaliações, os genótipos 0987014 e 0987028 apresentaram desempenho superior na maioria dos caracteres avaliados, se destacaram e poderão ser recomendados para o cultivo na região sudeste do Estado de Minas Gerais, após validação de seu valor de cultivo e uso em mais locais e anos

Otimização da produção de mudas de Cattleya labiata: efeito da sacarose no crescimento in vitro e na aclimatização.

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Tipo de corte em caule juvenil de coroa-de-frade para formação de brotos in vitro.

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