engleski

Effect of three herbicide combinations on agronomic and morphological traits of flue- cured tobacco (Nicotiana tabacum L.)

In flue-cured tobacco (N. tabacum L.) production the most important agronomic traits are yield and cured leaf quality. They depend on cultivar and cultural practices. Weeds in tobacco reduce plant growth by competing with the crop for light, nutrients and water. They also serve as a host for tobacco diseases and pests. Beside crop rotation, early stalk and root destruction and cultivation, herbicides have been regularly applied in tobacco production. Inadequate and excessive use of herbicides is costly, envi¬ronmentally detrimental, and can have negative effect on yield and value of produced crop. In order to investigate the effect of three herbicide combinations (pendimethalin 1980 g ha-1 + clomazone 288 g ha-1 ; pendimethalin 990 g ha-1 + clomazone 288 g ha-1 ; only 288 g ha-1 clomazone) on agronomic and morphological traits of flue-cured tobacco, a field trial was conducted during the 2009 growing season. The experiment with two Croatian flue-cured tobacco cultivars and the three herbicide treatments was set up as a RCBD, at two locations in northern Croatia. Differences among the three herbicide combinations were not significant in any of the studied traits. However, decrease of pendimethalin rate from 1980 to 0 g ha-1 resulted in a tendency of yield, price and value increase (8.97%, 2.47% and 11.66% respectively). Results of this study indicate that application of 288 g ha-1 of clomazone only, might be sufficient for successful weed control and achievement of high yield and good quality in flue-cured tobacco production in northern Croatia.

flue-cured tobacco; weed management; herbicides

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