Resumo
A detailed statistical analysis of a balanced, incomplete block experiment with insecticides to control tomato spotted wilt is given. The effect of the treatments was studied in relation to stand an yield. The angular transformation was used for stand, and the analysis of stand and yield was made with and without the inter-block information. The results indicated that all insecticides tested, viz. Rhodiatox, Fosfern, Hexason 2510 M, Toxaphene, and tartar emetic reduced the number of plants killed by spotted wilt. The higher the concentration of the insecticides the better was the gain in stand. Some insecticides had a detrimental effect on the plant, at, high concentrations. In relation to yield the treatments could be placed in two groups : a) a group in which ilemage caused by the treatment was greater than the benefit, resulting from a better stand with no gain in yield ; b) a group in which there was also a gain in yield.
Análise de um experimento para combate de vira-cabeça do tomateiro(1 (1 ) Trabalho a ser apresentado no 5.° Seminário de Estatística, a se realizar em Curitiba, em novembro de 1950. )
C. G. Fraga Jr.I; A. S. CostaII
IEngenheiro agrônomo, Secção de Técnica Experimental e Cálculo
IIEngenheiro agrônomo, Secção de Genética, Instituto Agronômico de Campinas
SUMMARY
A detailed statistical analysis of a balanced, incomplete block experiment with insecticides to control tomato spotted wilt is given. The effect of the treatments was studied in relation to stand an yield. The angular transformation was used for stand, and the analysis of stand and yield was made with and without the inter-block information.
The results indicated that all insecticides tested, viz. Rhodiatox, Fosfern, Hexason 2510 M, Toxaphene, and tartar emetic reduced the number of plants killed by spotted wilt. The higher the concentration of the insecticides the better was the gain in stand. Some insecticides had a detrimental effect on the plant, at, high concentrations.
In relation to yield the treatments could be placed in two groups : a) a group in which ilemage caused by the treatment was greater than the benefit, resulting from a better stand with no gain in yield ; b) a group in which there was also a gain in yield.
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Full text available only in PDF format.
LITERATURA CITADA
- 1. Cochran, W. G. e Cox, G. M. Em The experimental designs, pág. 322-324. 1.Ş edição, John Wiley & Sons, Nova Iorque, 1950.
- 2. Costa, A. S., Forster, R. e Fraga Jr., C. G. Contrôle de vira-cabeça do tomate pela destruição do vetor, Bragatitia 10 : 1-9, fig. 1. 1950.
- 3. Fisher, R. A. & Yates, F. Em Statistical tables for biological, agricultural and medical research pág. 42, 1.Ş edição. Oliver and Boyd, Londres, 1938.
- 4. Mather, K.Em Statistical analysis in biology, pág. 234-239, 2.Ş edição, Interscience Publishers Inc. Nova Iorque, 1947.
Datas de Publicação
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Publicação nesta coleção
09 Jun 2010 -
Data do Fascículo
1950
