THE EFFECT OF FOLIAR BORON APPLICATION ON FLOWER BUD WINTERHARDINESS, FRUIT SET AND POLLEN QUALITY OF SOUR CHERRIES IN LATVIA
Journal Title: FRUIT GROWING RESEARCH - Year 2017, Vol 0, Issue
Abstract
Boron (B) is essential nutrient element in plants, needed in the growth of new tissues and reproductive processes. B in the soil is poorly accessible if soil reaction is neutral. Postharvest sprays of B fertilizer increase the content of B in flower buds, but the effect on fruit set used to be inconsistent. The aim of the research was to determine the effect of foliar boron application on flower bud winterhardiness, fruit set and pollen quality of sour cherry cultivars ‘Latvijas Zemais’ and ‘Zhukovskaya’. The research was carried out at the Institute of Horticulture, Latvia University of Agriculture, basing on sour cherry trial established in neutral soil. Foliar boron application was done once a year, at the BBCH stage 91. The percentage of damaged buds was calculated for the evaluation of winterhardiness. Fruit set was determined as the ratio of flowers and fruits. Leaf boron content was determined before the foliar boron application. Pollen quality was characterized by testing of pollen viability and germination capacity. Significant and cultivar depended impact of foliar B application on flower bud winterhardiness was detected in one of four years. Leaf B content varied from 21 to 24 mg kg -1 in ‘Zhukovskaya’ and fruit set after foliar B application increased in whole range. B content in the leaf of ‘Latvijas Zemais’ ranged from 21 to 33 mg kg -1, the increase of fruit set after one foliar B application was observed in the trees with boron content 23 to 26 mg kg -1. The fluctuations of fruit set were less and pollen quality was higher if the trees were treated with B in both cultivars. At least one postharvest foliar B application can be recommended for sour cherries grown in neutral soils in Latvia with the taking into account initial B content in the leaf.
Authors and Affiliations
Daina Feldmane, Madalina Militaru, Valentina Pole
Keywords
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