APPARATUS FOR DETERMINATION OF PROPER TREE VIGOR OF LARGE SEED GRAPES IN SEEDLESS CULTIVATION, AND CULTIVATION METHOD USING THE SAME

摘要

PURPOSE: A subjective tree vigor determining device for seedless cultivation of large-grain grapes is provided to easily determine tree vigor right after harvest or during winter pruning, and a seedless cultivation method of large-grain grapes using the tree vigor determining device is provided. CONSTITUTION: A tree vigor determining device comprises a groove having a half-moon shape such that a branch can be inserted between a first bud and a second bud of a bearing branch. Determination standards are written on a circular plate of the tree vigor determining device for Campbell Early grapes: 7-9 mm (very weak): cut 1/3 of a main branch, concern of mixing with seeded grapes; 9-11 mm (weak); constantly manage practices, fat granules are bad; 11-13 mm (normal); normally manage vines, maintain an appropriate amount of fruit setting; 13-15 mm (strong); concern of decrease of flowers, perform selective thinning; 15 mm or greater (very strong); and bad germination, perform thinning on an entire area. Tree vigor is determined by measuring the thickness of a branch by inserting the branch between the first and second buds into the groove having a half-moon shape. [Reference numerals] (AA) 4-6mm very weak; (BB) 6-8mm weak; (CC) 8-10mm normal; (DD) 10-12mm strong; (EE) 12 mm or greater very strong; (FF) Need to be determined; (GG) National Institute of Horticultural and Herbal Science