Efeito da aplica??o foliar de boro e zinco sobre a produ??o e os teores de SST e ATT dos frutos da Pereira-Japonesa e da pinheira

摘要

Leaf spray using liquid products with micronutrients, among them, quelates are usual in fruit trees. However, there is no research showing results on it. In this way, the aim of this study was to verify the effects of B and Zn applied on leaves on production, SST and ATT of pear fruit and sugar apple. The experiment was conducted on irrigated area in Ilha Solteira - SP, Brazil. A red brown Podzolic and plants of sugar apple and pear, Okussankichi cv. were used. The treatments were: T1. water, T2. boric acid, T3. zinc sulfate, T4. T2 + T3, T5. boric acid + urea + citric acid + EDTA, T6. zinc sulfate + urea + citric acid + EDTA, T7. T5 + T6, T8. boric acid + urea + citric acid + EDTA + sodium molibdate + sulfur + calcium chloride, T9. zinc sulfate + citric acid + EDTA + Fe sulfate + Mn sulfate + Mg sulfate and, T10. T8 +T9. It was used doses of 110 g ha-1 of B and 250 g ha-1 of Zn, in each application. A randomized blocks design was used and to compare the averages the Tukey test was applied. It can be concluded: a) the production, SST and ATT of pear fruits and sugar apple fruits were not influenced by B and Zn leaf application, b) boric acid plus quelates were efficient to supply B to pear plants but not to sugar apple plants, c) Zn sulfate plus quelates caused an increase in Zn leaf content only in pear plants.