The effect of grapevine cultivation technology elements on harvest and efficiency coefficient of photosynthetically active radiation of clone 337 of ‘Cabernet Sauvignon’ in the conditions of Western piedmont-coastal region of Crimea

Abstract

the paper summarizes results of a three-year study on clone 337 of ‘Cabernet Sauvignon’ cultivar in the western piedmont-coastal region of Crimea. the paper demonstrates the influence of various bush loads (11, 17 and 22 eyes) and green operations
(shoot trimming, harvest regulation, leaf removal in the bunch area on the eastern
side) on the yield size and efficiency coefficient of photosynthetically active radiation.
it was found that the maximum efficiency of photosynthetically active radiation made
0.52% with the bush load of two fruiting canes without subsequent green operations.
the 93.4% variance of the efficiency coefficient of photosynthetically active radiation is
dependent on leaf surface area variations of the bush. there is a strong linear correlation and regressional relationship between the efficiency of photosynthetically active
radiation and the yield of grapes per bush. the 99.9% increase of the yield per bush
weight depends on the change in the leaf surface area of the bush and the efficiency
coefficient of photosynthetically active radiation. increasing the load up to 17-22 buds
when pruning will contribute to the most rational use of bush productivity resources
of clone 337 of ‘Cabernet Sauvignon’ in the western piedmont-coastal region of Crimea.