Eficiência do delineamento fatorial 3³, em blocos de 9, em uma série de experimentos de adubação do algodoeiro Efficiency of a 3³ factorial design for cotton fertilizer experiments

• Main Authors: Wanderley Rinaldo Venturini, Joassy de Paula Neves Jorge
• Format: Article
• Language: English
• Published: Instituto Agronômico de Campinas 1962-01-01
• Series: Bragantia
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051962000100035

Êste trabalho estuda a eficiência do delineamento fatorial 3³, em blocos de 9, em relação ao delineamento completamente casualizodo. Utilizaram-se cêrca de 260 experiências de adubação de olgodoeiro, realizadas nos anos de 1957/58, 1958/59 e 1959/60, em diferentes locais escolhidos, os quais abrangeram os principais tipos de solo cultivado com algodão no Estado de São Paulo. O confundimento em blocos de 9 foi, em média, 20% mais eficiente que o delineamento sem restrição.<br>The purpose of this work was the study of the efficiency of a 3³ factorial design, confounded in blocks of 9 units, in comparison with the completely randomized design. Approximately 300 cotton experiments were conducted during the years of 57/58, 58/59, 59/60 on different kinds of soils of the State of São Paulo. From the results of the experiments in which confounding was employed, we estimated what the experimental error would have been if this technique had not been used; a comparison was mode between the two experimental errors and the efficiency was calculated. Confounding in blocks of 9 units has presented a gain in precision of about 20% when compared with the completely randomized design.