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Effect of Planting Time and Micronutrient as Zinc Chloride on the Growth, Yield and Oil Content of Mentha Piperita.

Nasima Akhtar
Plant Physiology Section, BCSIR Laboratories, Dhaka

M. Abdul Matin Sarker
Plant Physiology Section, BCSIR Laboratories, Dhaka

Hasina Akhter
Plant Physiology Section, BCSIR Laboratories, Dhaka

M. Katrun Nada
Essential oil Section, BCSIR Laboratories Dhaka Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to find out the effect of essential oil percentage content and morphogenesis of Mentha piperita with foliar treatment of different concentration of zinc solution (1ppm, 1.5ppm, 2ppm, 2.5ppm, 3ppm and 3.5ppm as zinc chloride). An experiment was set up in earthen wear pots in three seasons of Bangladesh (winter, summer and monsoon). Zinc solutions were first applied as foliar treatment at 30 days after planting, second and third treatment was applied after seven days intervals. Harvesting was carried out at 65 days after planting. In monsoon the maximum increase of leaves/hector (37.31 t /hector) with 3 ppm Zn chloride solution and it was followed by summer (23.11t/hector) with 1ppm zinc chloride solution. 28.2% essential oil was increased compare with the control plant in summer with 3ppm zinc chloride solution; it followed by monsoon 6.7% essential oil when foliar treatment was 2.5ppm. Acid value, refractive index and density of oil were remaining more or less same in the whole period of the treatment.

Keywords: Mentha piperita, Planting time, Zinc chloride, Oil content quality, Plot yield.

Location: Open roof of glass and ceramic building of BCSIR Laboratories, Dhaka

Start Date:

End Date:

Program Area: Development of Host and Medicinal Plants

Commodity: Medicinal Plants

Objectives:

In the present study an attempt was made to increase the percentage of essential oil of Mentha piperita with different concentration of zinc chloride solution in three different season of Bangladesh.

Methodology:

The experiment was set up on the open roof of glass and ceramic building of BCSIR Laboratories, Dhaka in three season of Bangladesh (winter, summer and monsoon). The herbs (Mentha piperita) were cultivated in equal sized (24.7 cm height and 28 cm inner diameter) earthenware pots. There were six treatments (1ppm, 1.5ppm, 2ppm, 2.5ppm, 3ppm and 3.5ppm) of aqueous solution of micronutrients and water treated control. Each treatment had three replicas, including control.The physico-chemical properties of soil of pot are given in Table I. In winter season the Mentha piperita was planted at the 1st week of January and it was harvested in the last week of March. In summer the planting time of Mentha piperita is 1st week of April and harvesting month was last week of June and in monsoon the planting time of Mentha piperita was 1st week of July and harvesting time was last week of September. In all the sets soil treatments was same. Each pot contained equal amount of soil and cow dung. The solutions were sprayed on the one month old M. piperita leaves were uniformly grown. The solutions were sprayed one-week interval thrice a time with the experimental period. Data on plant height, number of leaves and number of branches per plant were recorded from 10 randomly selected plants. For total yield and the collection of leaves for oil extraction of all treated Mentha herbs were performed just after 35 days of the 1st foliar spray, i.e., two weeks after the last foliar spray. For the essential oil extract steam dilution method was followed (Guenther 1949). The freshly harvested leaves from each plot was subjected to steam dilution for about three hours and the separated out from the distillate was dehydrated over anhydrous solution sulphate where by a pale yellow volatile oil was obtained in pure form, physical and chemical characteristics of Mentha oil collected from each treatment were determined accordingly to standard method (Association of Official Analytical Chemicals 1984). The collected data were statistically analyzed.

Source of Information: Bangladesh J. Sci. Ind. Res. 44(1), 125-130, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In this study it was found that the 3 ppm zinc chloride solution for foliar treatment on Mentha peperita plant most effective for vegetative growth and as well as quantitative yield of its essential oil. To establish the present findings, further researches are needs in this direction with other varieties of Mentha sp.

Knowledge Management: Journal