Fruit yield characteristics of seedless watermelon as influenced by sources and doses of potassium.
The experiment was carried out on a farm, in the Borborema County, State of Sao Paulo, Brazil from February to April 2002, in Typic Paleudult. The objective of this work was to investigate the influence of sources and doses of potassium on fruit yield characteristics of seedless watermelon. The experimental design was randomized complete blocks, with three replications, in 3×4 factorial scheme, corresponding to potassium sources (potassium chloride, nitrate and sulfate) and doses (50, 100, 200, and 300 kg K2O ha-1, respectively). The highest number of fruits per plant (1.7) was achieved with 172 and 182 kg ha-1 K2O, using, respectively, KNO3 and KCl as fertilizers. Fruit weight was influenced only by potassium doses and 158 kg ha-1 K2O produced the highest weight. Maximum yields were obtained with 94.1, 183.0, and 193.4 kg ha-1 K2O, using K2SO4, KCl, and KNO3, respectively. Each kg of K2O used as K2SO4 yielded 201.6 kg of fruits, whereas the same amount of K2O as KCl and KNO3 yielded 111.5 and 109.6 kg of fruits.