Uniformidade da produção numa experiência de adubação da laranjeira baía

[摘要] 1) - The present paper contains the results of the analysis of homogeneity in an experiment on the fertilization of the orange "Baía" (Washington Navel), in progress since 1932 in the Experiment Station of the Instituto Agronômico do Estado de São Paulo, at Limeira, São Paulo, Brasil. Such an experiment has to be divided into two phases': a preliminary period during which the trees remain without fertilizer in order to study their production and the homogeneity of the experimental plots, and the final period during which the different treatments are to be applied. The trees entered into production in 1938. It was decided to close up the first period after three harvestings, viz., in 1938, 1939 and 1940. The number of yields at our disposal remained thus very small. The trees, requiring urgent fertilization, began to be treated in 1941. 2) - Special care was taken while selecting a suitable, homogenous, minimum area of 233.600 sq. m. where to plot the experiment. Sour orange rootstocks from non selected seeds were subjected to a rigorous selection before budding. The buds were taken from two selected trees of heigh quality "Baía" variety. 3) - Every year the total number of fruits and their total weight in kg per tree were determined. These data were then subjected to a detailed statistical analysis, the results of which are presented in this paper.