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Effect of summer hedge-pruning and gibberellic acid foliar spray on yield and alternate bearing of S-700 jojoba clone (Simmondsia chinensis (Link) Schneider)

Bakeer, S.M.
Industrial crops and products 2019 v.128 pp. 371-376
Simmondsia chinensis, alternate bearing, branching, flower buds, foliar spraying, gibberellic acid, harvesting, jojoba, pruning, seed yield, summer, trees, vegetative growth
In jojoba, flower buds develop exclusively on new growth near branch tips. An increase in the number of growing tips (branching frequency) could possibly increase flower buds and seed yield. This study was conducted to determine the effect of summer hedge pruning and gibberellic acid spraying on vegetative growth, flower bud production, seed yield and alternate bearing of 12-year-old S-700 jojoba clone. Hedge-pruning was done after harvesting during the mid- July in 2015 and 2016 seasons. Trees crown formed as hedge wall of about 1.0 m, 1.5 m width, and unpruned trees as control. Trees were sprayed with GA3 at 0, 100 and 150 ppm three times a year started at 1st August with one-month intervals. Obtained results showed that hedge-pruning treatments alone or in combination with GA3 foliar spray treatments enhanced branching density, flower bud production, seed yield and, controlling alternate bearing. Hedge- pruning at 1.5 m width in combination with GA3 at 150 ppm proved to be the most effective treatment for improving seed and wax yield of S-700 jojoba clone in the off-year season.