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Mohammad Ali Khalaj,Shahram Kiani,Amir Hosein Khoshgoftarmanesh,Reihaneh Amoaghaie 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.4
We investigated the effects of different NO3¯:NH4+ratios in nutrient solution on the yield and growth ofgerbera (Gerbera jamesonii) cut flowers in soilless culture. Two cultivars of gerbera (red ‘Stanza’ and yellow ‘DoubleDutch’) were supplemented with four different NO3¯:NH4+ratios (100:0, 80:20, 60:40, and 40:60). Replacing 20%nitrate in the nutrient solution with ammonium resulted in the higher number of leaves per plant, highest fresh anddry weights of roots and shoots, greatest number of flowers, highest flower stalk diameter and flower disk diameter,longest vase life, highest fresh and dry weight of inflorescences, and highest relative water contents in petals comparedwith the control. Decreasing the NO3¯:NH4+ratio to 60:40 caused a considerable reduction in plant growth and biomass. The chlorophyll and carotenoid contents, as well as catalase (CAT) and peroxidase (POX) activity, increased withincreasing proportion of ammonium-to-nitrate in the nutrient solution. The results suggest that a NO3¯:NH4+ratio of80:20 should be used for gerbera cut flower production to achieve the highest growth and quality.