Izvorni znanstveni članak
THE EFFECTIVENESS OF CONTROL OF SUCKERS, AND RESIDUES OF MALEIC HYDRAZIDE IN FLUE-CURED TOBACCO ACCORDING TO THE AMOUNT OF APPLIED AGENTS
Miroslav Čavlek
; Duhanski institut Zagreb d.d., Zagreb, Hrvatska
Kristina Gršić
; Duhanski institut Zagreb d.d., Zagreb, Hrvatska
Sažetak
The objective of the study was to determine the effectiveness of the control of suckers and the maleic hydrazide residues content in the dried leaves of flue-cured tobacco due to the amount of applied agents and leaves positions on the stalk. In 2008 and 2009 field experiments were organized at eight family farms, which represented the whole tobacco growing areas in Croatia. Treatments in experiments after topping were: (1) without the use of chemicals to control the suckers, (2) application of maleic hydrazide 14 l/ha, and (3) application of mixture of maleic hydrazide 9 l/ha with the contact agent at a concentration of 5 %. Application of maleic hydrazide in the quantity of 14 l/ha and high-quality and timely application of mixture of maleic hydrazide in the amount of 9 l/ha with 5 % concentrated contact agent achieved similar effectiveness in controlling the number and fresh weight of suckers. Delay time of application of maleic hydrazide after last application of contact agents reduced the effectiveness of the control number and fresh weights of suckers.
The average maleic hydrazide residues content in tobacco leaf in 2008 when it was used in the amount of 9 l/ha and 14 l/ha were 17.27 mg/kg and 27.35 mg/ha, while in 2009 average residue contents were 44.84 mg/kg and 70.34, respectively. The maleic hydrazide content declined from upper to lower stalk positions and was correlated with the number of days from the application of maleic hydrazide to harvest of tobacco leaves.
Ključne riječi
maleic hydrazide; the number of suckers; fresh weight of suckers; maleic hydrazide residue; leaf stalk position; flue-cured tobacco
Hrčak ID:
97742
URI
Datum izdavanja:
19.12.2012.
Posjeta: 1.261 *