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Effect of Zn and Fe Spray and Harvesting Time on Dry Matter and Volatile Oil Production of Mentha asiatica L. and Mentha longifolia  Leaves . Journal of Iraqi Agricultural Sciences, Vol.(31), No.(1), 2000
 
Abstract :
 
A field experiment was carried out for two successive seasons (1997 and 1998) to study the effect of Zinc sulfate (ZnS04.7H20) at rates 0,4 and 8 kg/ha and chelated iron ( Sequestren , 10% Fe ) at rates 0 and 30 kg/ha on dry matter and volatile oil production in leaves of M. asiatica and M. longifolia during different growth stages .
 
Results showed that spraying with Zn and Fe at high concentrations increased dry matter production in M. asiatica (2969 kg/ha) while decreased it in M. longifolia (2152 kg/ha). However, spraying either Zn or Fe increased volatile oil percentage for both species significantly.
 
Growth stage had significant effect on volatile oil where the highest percentage and quantity was in the spring harvest 1997(6.26% and 169.4 kg/ha respectively) compared to the lowest percentage (3.90%) in spring harvest 1998 and lowest quantity (87.0 kg/ha) in autumn harvest.
 
This low oil production in autumn harvest is mainly due to cessation of the vegetative growth.
Highest dry matter production (3503 kg/ha) was noticed in spring harvest 1998 when plants were sprayed with high concentrations of Zn and Fe. However, highest oil percentage (8.03%) was found in spring harvest 1997 when Zn and Fe were sprayed at high concentrations.
 
Highest oil quantity (226 kg/ha) was produced in the plants which sprayed with highest concentration of Zn only in spring 1997.
 
It can be concluded that oil percentage decreased as plant proceed towards flowering , and although Zn spry decreased dry matter production it elevated oil percentage so oil production increased.    

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  • Effect of Zn

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