Taha, Ragaa A. and Ahmed, Basma ( 2014). Response of sweet marjoram plants to organic and bio. and/or mineral fertilization treatmentsMinia J. of Agric. Res. & Develop. Vol. (34), No. 2, pp. 193-214, 2014
Abstract: An experimental trail was carried out at the Floriculture Nursery, Fac. of Agric., Minia Univ., during the two successive seasons of 2011/2012 and 2012/2013 to study the effect of FYM and bio. and/or mineral NPK on marjoram plants. The data showed that, using 25 m3/fed. FYM significantly increased vegetative growth (plant height, number of branches/plant/cut, herb fresh and dry weights/plant/cut and total herb yield/plant/season, as fresh and dry weights), oil production (essential oil %, oil yield/plant/cut and oil yield/plant/season) and chemical composition (chlorophyll a, b and carotenoids contents, as well as, the percentages of N, P and K) over the other two used levels (15 and 20 m3/fed.) or control. Fertilizing plants with biofertilizers (phosphorein + Effective microorganisms), bio. + 50 or 75 % NPK dose or mineral NPK (full dose) led to significant increases in all previous studied characters comparing with control treatment. The treatment of bio. + 75 % NPK dose followed by NPK (full dose) treatment were the most effective ones in this concern. It may be recommended to use FYM at the rate of 25 m3/fed. and treating plants with bio. + 75 % NPK dose to give the highest values of vegetative growth, essential oil productivity and chemical composition of marjoram plants.
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