Cultivares de Panicum maximumvêm apresentando danos elevados com doenças, como a cárie do sino e a mancha foliar, causadas por Tilletia ayresiie Bipolaris maydis,respectivamente. Objetivou-se, neste trabalho, avaliar a reação de genótipos desta gramínea forrageira a essas doenças. Os experimentos foram conduzidos na Embrapa Gado de Corte, em Campo Grande (MS), no período de fevereiro a julho de 2012. Avaliaram-se, semanalmente, as intensidades das doenças em 26 genótipos de P. maximum.Dentre os genótipos avaliados, houve variação de graus de resistência para a cárie do sino e para a mancha foliar. As condições ambientais de temperatura e umidade relativa favoráveis à cárie do sino foram 16ºC a 27ºC e 62% a 88% e à mancha foliar 22ºC a 27°C e 62% a 83%. A resistência à cárie do sino mostrou ser caráter herdável e o genótipo PM40 comportou-se como a testemunha suscetível, Tanzânia-1, em relação à mancha foliar. O manejo de P. maximumcom corte de uniformização mostrou-se promissor na composição das estratégias de controle para redução da intensidade da mancha foliar.
Brassicas are oleraceous plants of great economic importance, and numerous factors can affect the yield and quality of these vegetables, including plant spacing and fertilisation. Thus, this study aimed to evaluate the effects of plant spacing and boron fertilisation on purple cabbage development and yield. The experiment was performed between march and july at the experimental site of the Mato Grosso do Sul State University (Universidade Estadual de Mato Grosso do Sul -UEMS), Aquidauana unit, located in Aquidauana, MS, Brazil. A randomised block design was adopted, employing a 2 x 5 factorial scheme with four replicates. Two row spacings (0.8 m × 0.4 m and 0.6 m × 0.4 m) and five boron doses (0, 2.5, 5.0, 7.5, and 10.0 kg ha -1 ) in the form of boric acid applied as topdressing were evaluated for a giant purple cabbage variety. The leaf boron content, plant height, stem diameter, head height and diameter, number of outer and inner leaves, fresh and dry weights of outer and inner leaves, head compactness and classification, and yield were evaluated. The results showed that reducing the row spacing from 0.8 m to 0.6 m increased the purple cabbage crop yield and the boron uptake by the plants. A smaller row spacing (0.6 x 0.4 m) and a boron dose of 6.01 kg ha -1 provided the highest cabbage yield.
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