ROLE OF GIRDLING, MICRO-NUTRIENTS, GROWTH RETARDANTS AND PRUNING IN PRODUCTION OF OLIVE (Olea europea L.) CV. FRONTOIO
Loading...
Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigations entitled "Role of girdling, micro-nutrients, growth retardants and pruning in production of olive (Olea europea L.) cv. Frontoio", were carried out during 2008-09 and 2009-10 on 15-years old olive trees in the orchard located at Dhramthal in Udhampur district of Jammu & Kashmir. The study was divided into three experiments to study the effect of girdling, micronutrients, growth retardants, and pruning on growth, flowering, yield and quality of olive cv. Frontoio. The effect of girdling and different concentrations of zinc sulphate and boric acid showed maximum shoot extension growth (8.92 cm) with the spray of 0.6% ZnSO<sub>4</sub> in combination with 0.6% boric acid and relative growth rate (0.033 cm cm<sup>-1</sup> month<sup>-1</sup>) with the spray of 0.5% ZnSO<sub>4</sub> in combination with 0.6% boric acid, respectively.
Maximum leaf area (4.87cm<sup>2</sup>), leaf water content (56.78%) and stomatal count (24.54 per microscopic field) was recorded with spray of 0.5% ZnSO<sub>4</sub> in combination with 0.6% boric acid , 0.6% ZnSO<sub>4</sub> spray in combination with 0.4% boric acid and 0.5% ZnSO<sub>4</sub> in combination with 0.6% boric acid, respectively. Maximum blooming intensity (0.50%) and proportion of perfect flowers (48.00%), was recorded with spray of 0.5% ZnSO<sub>4</sub> in combination with 0.5% boric acid and spray of 0.6%i ZnSO<sub>4</sub> in combination with 0.5% boric acid, respectively. Highest fruit yield (1.92 Kg/tree) and minimum fruit drop (52.21%) was recorded with the spray of 0.5% ZnSO<sub>4</sub> in combination with 0.6% boric acid. Maxiinum pulp;stone ratio of 2.57 and oil content of 25.62 per cent was recorded with the spray of 0.6% ZnSO<sub>4</sub> in combination with 0.6% boric acid and spray of 0.6% ZnSO<sub>4</sub> in combination with 0.4% boric acid, respectively. Maximum leaf K (1.74%), Ca (1.71) and Mg (0.154%) was recorded with spray of 0.5% ZnSO<sub>4</sub> in combination with 0.4% boric acid, 0.5% ZnSO<sub>4</sub> in combination with 0.5% boric acid and 0.6% ZnSO<sub>4</sub> in combination with 0.6% Boric acid, respectively. The application of growth retardants significantly influenced stomatal count, duration of flowering, blooming intensity, fruit set, fruit yield, fruit drop, pulp:stone ratio and oil conytent. Stomatal count of 24.50 per microscopic field was recorded highest with the spray of paclobutrzol 500 ppm. Duration of flowering was significantly reduced from 19.50 days to 16.83 days with the spray of chlormequat 2000 ppm. Maximum blooming intensity (0.49%). proportion of perfect flowers (37.33%), highest fruit yield (2.27Kg tree<sup>-1</sup>) and minimum fruit drop (51.63) was recorded with the spray of paclobutrazol 2000 ppm. Highest fruit set of 12.10 per cent was recorded with spray of paclobutrazol 1000 ppm. Application of paclobutrazol 500 ppm showed highest pulp:stone ratio (3.66) and maximum oil content (25.66%). The effect of time and severity of pruning on growth and productivity of olive showed that trees pruned on 15th January with 25% pruning intensity resulted in maximum shoot extension growth of 11.13 cm, highest relative growth rate of 0.063 cm cm<sup>-1</sup> month<sup>-1</sup>, leaf area (3.99 cm<sup>2</sup>), leaf water content (67.09%) and stomatal count (24.50 no./microscopic field). Maximum fruit set of 18.89 % and highest fruit yield of 2.73 Kg tree<sup>-1</sup> was recorded with 25 per cent pruning done on 15th January. The pulp: stone ratio (3.62) and oil content (27.03 %) were also significantly improved from 2.29 to 3.62 and from 20.79 to 27.03, respectively with 25 per cent pruning done on 15th January. Thus it can be concluded that application of 0.5% zinc sulphate in combination with 0.5% boric acid, 1000 ppm paclobutrazol sprayed in the first week of March and repeated 30 days after the first spray, and pruning done on 15th January with 25% pruning intensity improved the fruit production of olive cv. Frontoio by 30, 45 and 58 per cent, respectively as compared to the olive trees without any treatment.
Description
Keywords
null
Citation
No. of references 364