Original scientific paper

https://doi.org/10.33128/ag.80.6.1

EFFECT OF RIPENESS AND RELATED GROWING PRACTICES ON VIRGINIA TOBACCO II. TOTAL NITROGEN, PROTEINS, NICOTINE AND REDUCING SUGARS

Kristina Gršić ; Hrvatska agencija za poljoprivredu i hranu, Centar za zaštitu bilja, Zagreb, Hrvatska
Miroslav Čavlek ; Duhanski institut Zagreb d.o.o., Zagreb, Hrvatska

Abstract

The study was carried out during the 2006 and 2008 to determine the influence of topping height, method of harvest and leaf ripeness at harvesting time on the content of total nitrogen, nicotine, proteins and reducing sugars. Treatments in the experiment were topping height (17 and 20 harvesting leaves), method of harvest (3, 4 and 7 harvests) and ripeness of leaves at harvesting (unripe, ripe and overripe). A split-split plot design with four replications was applied. The concentration of investigated chemical properties was studied in the leaves from the third (6th and 7th leaf) and seventh (14th and 15th leaf) stalk segments. Height of topping did not affect the average content of total nitrogen, proteins, nicotine and reducing sugars. The influence of the method of harvest on the investigated chemical composition was small. Delaying harvest caused decreases in average total nitrogen and proteins content, increases in nicotine content, and the content of reducing sugars increased to optimal ripeness or overripeness. However, the presence of interactions suggests that harvesting tobacco leaves at different stages of ripeness can produce inconsistent results depending on the method of harvest and the height of topping.

Keywords

virginia tobacco; ripeness; topping height; harvesting method; chemical properties

Hrčak ID:

222981

URI

https://hrcak.srce.hr/222981

Publication date:

3.6.2019.

Article data in other languages: croatian

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