Naslov
Effect of topping height, ripeness at harvest and cultivar on certain properties of leaves from the upper stalk position of flue-cured tobacco in Croatia

Autori
Čavlek, Miroslav ; Gršić, Kristina

Izvornik
Cereal Research Communications (0133-3720) 36 (2008), Part 3 Suppl. 5; 1664-1667

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ripeness; topping height; cultivar; flue-cured tobacco

Sažetak
Tobacco ripening, a continuous process that includes the absorption of nitrogen from the soil, the reduction of nitrates into nitrogen compounds in the plant, photosynthesis and the accumulation of starch in the leaf, was studied during 2004-2005. For this purpose, investigations were organized in the main tobacco growing regions in Croatia, according to the split-split plot method. The treatments in the field trials were topping height (20 and 17 leaves for harvest), ripeness (underripe, ripe, overripe) and cultivar (HVT 1, VJ 1 and DH 17). The results of the study of flue-cured tobacco leaves from the upper half of the stalk (12-20 leaves) showed trends of greater yield, higher selling price per kg and increased overall value per ha of the harvested underripe tobacco leaves, according to the customary visual ripeness criteria for crops in the tobacco growing region. Better results were recorded in 2005, which was a wetter year. Interactions between the cultivar height and ripeness at the moment of harvest, for 12– 14 leaves, in 2004 and 2005 for tobacco yield and in 2004 for the value per hectare, indicate better ripening of low-topped tobacco. The differences produced by treatments in the nicotine content, reducing sugars and total nitrogen were not consistent. The content of reducing sugars in the meteorologically more favorable 2005 was significantly higher and accompanied by significant reduction in the overripe phase. Interactions found between the degree of ripeness at the moment of harvest and the cultivar in the nicotine and total nitrogen contents lead to the conclusion that the cultivar DH 17 is somewhat late ripening in comparison to the cultivars HVT 1 and VJ 1.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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