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The effects of urea, boric acid and zinc sulphate on quantitative characteristics of olive (Olea europaea L. 'Shengeh') stone by foliar application
- Sayyad-Amin, P., Shahsavar, A.
- Acta horticulturae 2013 no.981 pp. 343-347
- Olea europaea, aerial parts, agricultural soils, alternate bearing, boric acid, cultivars, foliar application, fruits, olives, soil depth, soil nutrients, trees, urea, zinc sulfate, Iran
- Fars province has the first rank in olive (Olea europaea L.) in Iran according to cultivation surface. Olive has many varieties. ‘Shengeh’ is the most common variety which is grown in this province. This cultivar has many problems such as alternate bearing, low quality and quantity of the fruits. Low agricultural soil depth of this area was induced not to deliver soil nutrients to aerial parts of tree. The aim of this study was to examine the response of olive (Olea europaea L. ‘Shengeh’) to foliar application of boric acid, zinc sulphate and urea. The experiment was done in a private orchard in southern Fars province. Treatments comprised boric acid and zinc sulphate (0, 2000, 4000 mg L-1) and urea (0, 5000, 7500 mg L-1) on the stone (fresh and dry weight, diameter, length) at two second harvest stages. Results showed that the most fresh and dry weight stone were seen in zinc sulphate at 4000 mg L-1 alone, zinc sulphate at 4000 mg L-1 plus boric acid at the same concentration and 0 mg L-1 urea, respectively. The highest diameter and length stone were seen in zinc sulphate at 4000 mg L-1 alone, and 7500 mg L-1 alone at first harvest, respectively. At second harvest, the most fresh and dry weight stone were observed at 4000 mg L-1 boric acid along with zinc sulphate at the same concentration and 5000 mg L-1 urea, and 4000 mg L-1 boric acid along with zinc sulphate at the same concentration and 0 mg L-1 urea, respectively. The highest diameter and length fruit were seen in urea at 5000 mg L-1 alone and 2000 mg L-1 zinc sulphate alone, respectively.