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Use of biostimulants to promote growth of young olive trees
Abstract
In 2019-2020 trials were carried out to evaluate the effects of an organic fertilizer (Grena “olivo special”) and two biostimulants (“Idrogrena” and “Idrogrena Energy") on the growth and physiology of young olive trees. Growth was estimated in terms of increase in diameter of the main stem and of the total height of the trees. The experiments were carried out using both potted and field grown trees. The effects of the organic fertilizer, also reported to have a biostimulant action, and the two biostimulants were evaluated with respect to trees treated with urea used as the control. The organic fertilizer was applied entirely at the beginning of the experiment. Urea and biostimulants were applied weekly through fertigation and the latter also through foliar treatments in potted trees and on the soil and through fertigation in field grown trees.
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The organic fertilizer resulted more effective than urea in promoting the growth of young olive trees. The addition of biostimulants, through fertigation and foliar treatments, to trees treated with the organic fertilizer caused further growth of the trees in the latter part of the season. The effects of the organic fertilizer and biostimulants on the photosynthetic activity were also evaluated.
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