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National Agricultural Research Centre (NARC), Islamabad  established in 1984, is the largest research centre of the Pakistan Agricultural Research Council (PARC). NARC, with a total land area of approximately 1400 acres, is located near Rawal Lake, six kilometers south-east of Islamabad. Physical facilities in term of experimental fields, laboratories, green houses, gene bank, library/ documentation, auditorium, machinery & lab equipment repair workshops, stores, hostels, cafeteria, audio visual studios, are also available at NARC.

Journal Article

Journal article

Effect of compost and bio-fertilizers on growth, yield and essential oil of sweet marjoram (Majorana hortensis) plant  [2008]

Gharib, F.A. (Helwan Univ., Cairo (Egypt). Botany Dept.); Moussa, L.A. (Agriculture Research Center, Cairo (Egypt). Microbiology Dept.); Massoud, O.N. (Agriculture Research Center, Cairo (Egypt). Soil Water and Environmental Research Inst.);

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A pot experiment was conducted to determine the effect of compost and bio-fertilizers on the growth, yield and oil constituents of marjoram (Majorana hortensis L.). Forty five days old seedling were transplanted in soil treated with 15 and 30% aqueous extracts of compost and/or biofertilizers (mixture of Azospirillum brasiliense, Azotobacter chroococcum, Bacillus polymyxa & B. circulans) in addition to the recommended nitrogen, phosphorus and potassium (NPK) doses as control. Use of combined treatment of bio-fertilizers gave better results for all studied traits than those obtained from either nitrogen fixers (Azos. brasiliense, Azot. chroococcum & B. polymyxa) or (B. circulans) alone. The oil percentage and yield per plant for three cuttings was almost twofold higher on fresh weight basis as a result of aqueous extracts of compost at low level + bio-fertilizers compared with control, indicating that combinations of low input system of integrated nutrient management could be beneficial to obtain relatively good yields of essential oil. Oil composition using GC/MS revealed that marjoram belongs to the cis-sabinene hydrate/terpinene-4-ol chemo type. The chemical composition of marjoram essential oil did not change due to the fertilization type or level; rather the relative percentages of certain constituents were affected. The highest level of cis-sabinene hydrate (18.47%) and terpinene-4-ol (24.24%) was obtained with aqueous extracts of compost at 30% + B.
circulans and aqueous extracts of compost at 30% + (A. brasiliense + A. chroococcum + B. polymerase), respectively. Other components showed different concentrations depending on treatment and level of compost.

From the journal

International Journal of Agriculture and Biology (Pakistan)

ISSN : 1560-8530