número de amostras e relação dimensão: formato da moldura de amostragem para determinação da massa de forragem de gramíneas cespitosas number of sampling and dimension: format ratio of the quadrat for herbage mass determination in tussock-forming grasses

Clicks: 249
ID: 213600
2005
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Abstract
No sentido de delinear sistemas de pastejo eficientes, é necessário avaliar periodicamente a massa de forragem na propriedade, no entanto, o conhecimento do número de amostras e da moldura de amostragem (tamanho e forma) a ser utilizada permanece incompleto. Nesse contexto, três experimentos foram delineados para avaliar o efeito do número de amostras (de duas a nove) e da relação dimensão:formato da moldura (0,25; 1,0; 2,0 e 3,0 m² nos formatos quadrado e retangular) sobre o coeficiente de variação em determinações da massa de forragem realizadas em pastagens que formam touceiras. Utilizou-se delineamento em blocos completos casualizados, em um arranjo fatorial, com três ou quatro repetições, de acordo com o experimento. A interação entre o número de amostras e a relação dimensão:formato da moldura não foi significativa. A análise dos efeitos principais indicou que pelo menos quatro amostras de 1 m² (1 m x 1 m) devem ser feitas no sentido de estabilizar o coeficiente de variação e possibilitar uma estimativa confiável da massa de forragem.
In order to delineate efficient grazing systems it is important to periodically assess the herbage mass at the farm level. However, the knowledge concerning both, the number of samplings that should be performed and the quadrat (size and format) that should be used in these evaluations remains incomplete. In this context, three experiments were delineated to evaluate the effect of the number of samplings (varying from two to nine) and the dimension:format ratio of the quadrat (.25, 1.0, 2.0, and 3.0 m² for quadrate and rectangular formats) on the coefficient of variation in herbage mass determinations performed on tussock-forming pastures. A randomized complete block design, following a factorial arrangement with three or four replicates, according to the experiment, was adopted. The interaction between the number of samplings and the dimension:format ratio of the quadrat was not significant. The overall analysis of the main factors indicated that at least four samplings with a 1 m²-quadrat (1 m x 1 m) should be performed in order to stabilize the coefficient of variation and provide a reliable estimate of the herbage mass.
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Authors ;Marco Antonio Penati;Moacyr Corsi;Cesar Gonçalves de Lima;Geraldo Bueno Martha Júnior;Carlos Tadeu da Silva Dias
Journal european journal of lipid science and technology
Year 2005
DOI
10.1590/S1516-35982005000100005
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982005000100005
Keywords
panicum maximum pennisetum purpureum

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