ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
SPRAY DEPOSIT WITHIN APPLE TREES OF DIFFERING SIZES AND GEOMETRY AT LOW, MEDIUM AND HIGH SPRAY VOLUMES. |
| Authors: | G. Doruchowski, S.A. Svensson, L. Nordmark |
| Keywords: | spray deposit, spray volumes, tree geometry, TRV, cross-flow sprayer |
| Abstract:
Spray volumes 120, 200 and 400 l/ha were applied in three apple orchards of differing sizes and geometry of tree canopies. The average dimensions [height x width] of the trees were as follows: bush trees - 2.5 x 2 m, hedgerow trees - 1,8 x 1 m, super spindle trees - 1,7 x 0,5 m. All the trees were sprayed from one side with a cross-flow sprayer at driving velocity 6 km/h and air-jet velocity 24 m/s. Volume retained on targets increased with volume applied and was the greatest for super spindle trees. Deposit of a.i. increased with decreasing volume of spray and tree size. When applying 120 l/ha the concentration of spray liquid should be twice as high as for 400 l/ha to obtain similar deposit of a.i. in the tree canopies which means that use of 120 l/ha allows for almost 50% reduction of chemicals. Very good spray distribution uniformity obtained for 120 l/ha applied in super spindle allows for alternate row spraying. | |
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