Effects of foliar applications of zinc and boron nano-fertilizers on pomegranate (Punica granatum cv. Ardestani) fruit yield and quality

Abstract

8 Pags.- 4 Tabls.This study was carried out to assess the effects of the foliar application of nano-fertilizers of zinc (Zn) and boron (B) on pomegranate (Punica granatum cv. Ardestani) fruit yield and quality. A factorial experiment was conducted based on a completely randomized block design, with nine treatments and four replications per treatment. Foliar sprays of nano-Zn chelate fertiliser at three concentrations (0, 60 and 120 mg Zn L−1) and nano-B chelate fertiliser (0, 3.25 and 6.5 mg B L−1) were applied as a single spray before full bloom at a rate of 5.3 L tree−1. The application of Zn and B increased the leaf concentrations of both microelements in August, reflecting the improvements in tree nutrient status. A single foliar spray with relatively low amounts of B or Zn nano-fertilizers (34 mg B tree−1 or 636 mg Zn tree−1, respectively) led to increases in pomegranate fruit yield, and this was mainly due to increases in the number of fruits per tree. The effect was not as large with Zn as with B. Fertilization with the highest of the two doses led to significant improvements in fruit quality, including 4.4–7.6% increases in TSS, 9.5–29.1% decreases in TA, 20.6–46.1% increases in maturity index and 0.28–0.62 pH unit increases in juice pH, whereas physical fruit characteristics were unaffected. Changes in total sugars and total phenolic compounds were only minor, whereas the antioxidant activity and total anthocyanins were unaffected.We express our gratitude to Ferdowsi University of Mashhad for financial support (code: 3/32199). Supported also by the Spanish Ministry of Science and Competitivity (MINECO grant AGL2013-31988, co-financed with the European Regional Development Fund) and the Aragón Government (group A03).Peer reviewe

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Last time updated on 25/04/2017

This paper was published in Digital.CSIC.

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