Influência da poda de renova??o e controle da ferrugem nas reservas de carboidratos e produ??o de pessegueiro precoce

摘要

This work aimed to verify the influence of the renewal pruning and control of the rust in the reserves of non structured carbohydrates in branches and cultivar peach tree roots Flordaprince, as well as the possible effect in the production and quality of the fruits. The work was conducted in the Vegetable Production Department at ESALQ-USP, in Piracicaba. The used experimental design was in seven random blocks, consisting of three treatments, being each part composed by four plants. The treatment 1 consisted in the renewal pruning that was done 45 days after the harvest, in October 2003. In the treatment 2, the renewal pruning was not accomplished, but the rust control was done. In the treatment 3 neither the renewal pruning nor the rust control was accomplished, making the leaves fall with anticipation. The data was submitted to the variance analyses and to the comparison of the averages by Tukey's test. The spacing pattern was of 3,0 for 1,2 m, (2777 plants/ha). The plants were conducted in the central leader's system and they received the usually cultural practices. Samples of roots and branches were collected and they were dried, crushed and submitted to the laboratory analysis to check the non structured carbohydrate contents. There is a float in the concentration of soluble carbohydrates in the roots and in the branches according to the harvest period, and the contents of soluble carbohydrates in the roots are always higher than in the ones found in branches. The treatment 2 showed larger production of fruits and larger number of fruits per plant. There was no effect of the treatments in the qualitative aspects of the fruits, such as diameter, length, coloration and content of soluble solids.