Aplicação de doses de 2,4-D na frutificação da abóbora tetsukabuto em duas épocas de cultivo.

Abstract

The vegetables are fruits of plants grown in all regions of Brazil, for example, the interspecific hybrid squash (Cucurb/fa max/ma x Cucuó/fa moschafa), known as Pumpkin type "Tetsukabuto." The aim of this study was to evaluate the response of hybrid squash Tetsukabuto when subjected to the application of different doses of 2,4-D applied to female flowers in two cropping seasons in the city of Pombal - PB. The experiments were conducted in a randomized block design conducted in the dry season (September-December 2010) and the other in the rainy season (February- May 2011). The treatments were applied to female flowers doses of 2,4-D (0, 60, 120, 180 and 240 mg L-l) with four replications. The characteristics were evaluated in two experiments: transverse diameter of the fruit, the fruit cavity diameter, flesh thickness, number of fruits per plant, fruit weight and productivity. The doses of 2,4-D influenced the characteristics evaluated only in the rainy season. In the dry season, the estimated value for the maximum number of fruits was 4.2 and the mass of fruit in fruit 2.116 kg-l were obtained at doses of 226.0 mg L-l and 194.2 mg L-1 2 ,4-D respectively, providing the addition of 7.8 t ha-1 (123.8%) in crop yield at a dose of 2,4-D 212.8 mg L-l, whereas in the rainy season the estimated vague for the maximum number of fruits was 20.3 fruits and fruit mass of 1.453 kg fruit-l were obtained at doses of 189.2 mg L-l and 240.0 mg L-1 2, 4-D, respectively, providing an increase in crop yield of 14.4 t ha-1 (261.8%) at a dosage of 2,4-D 240 mg L-l. Productivity in the rainy season was twice that of the dry season. In the rainy season the highest number of fruits per plant contributed to the production of smaller fruits.