engleski

The effect of anti-hail nets on the chlorophyll content index (CCI) and the total amount of nitrogen in leaf and sugar in the must cv. Grasevina

The grapevine as a perennial crops is particularly sensitive on hail because the consequences on the condition, amount and quality of yield manifest in several years.Therefore, the objective of this research has been to determine the effect of different color of anti-hail net on grapevine. The trial was set up on Klanjec wine-growing region (northwestern Croatia) according to randomize complete block design with 3 treatments (control, black net, white net). According to research results in the first sampling significantly highest amount of nitrogen was determined in the control treatment (2.32% in dry matter) and significantly lowest in treatment with white net (2.03% in DM). In the second sampling between the treatments have no significant differences. At harvest the significantly greatest amount of nitrogen was determined in the treatment with black net (1.71% in DM) and the significantly the lowest in the treatment with white net (1.57% in DM). Chlorophyll content index in the first and third sampling (harvest) was directly correlated with the amount of nitrogen. According this in the first sampling significantly highest CCI (15.7) was determined in the control and significantly the lowest CCI in the treatment with wite net. In the third sampling relatively highest CCI was determined in the treatment with black net (27.8) and relatively lowest in the treatment with white net (23.0). The amount of sugar ranged from 18.55 % to 21.25 % Brix, with the significantly highest value determined in the treatment with white net, while the control treatment and treatment with black net have no significant differences. According to this research in areas with critical number of sunshine hours for the cultivation of grapevines we can recommend to use white nets.

anti-hail net; CCI; nitrogen; sugar; grapevine

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