versión impresa ISSN 0006-8705
The influence of nitrogen, phosphorus, and potassium on the yield of the wheat plant was studied in a greenhouse experiment carried out in Mitscherlich pots filled with soil of the Glacial type as found in the state of São Paulo. A 3 x 4 x 3 factorial design with 3 pots per treatment was used. The agronomical variety of wheat used was Frontana. The influence of the treatments was studied on the height of the plants, number of ears produced, and on the dry weight of these. The results showed that nitrogen did not affect the height of the plants, but increased greatly the number of ears and their weight. Potassium showed a favorable effect on the three characters studied, but its influence was smaller than that of nitrogen for number and weight of ears. Phosphorus induced the greatest yield response and its effect was very pronounced on the three factors considered. A detailed analysis of variance for the characters studied with decomposition of main effects and interactions is given.