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چکیده
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One of the important goals of lisianthus (cut flower) producers is to reduce the growth period and increase the quality of the flower. The current research aimed to investigate the effects of foliar application of nano ZnO and nano CaCO 3 on growth and flowering of lisianthus ( Eustoma grandiflorum cv. Mariachi Blue). The experiment was carried out in greenhouse condition by spraying various concentrations of nano ZnO (3, 6 and 9 mg L -1 ) and nano CaCO 3 (250, 500 and 750 mg L -1 ) every 20 days. According to the results, foliar spraying of nano ZnO (6 mg L -1 ) on lisianthus increased number of leaf and lateral branches, leaf chlorophyll content and petal anthocyanin content. Nano ZnO spray also increased number of flowers. The results demonstrated that the plants sprayed with 500 mg L -1 nano CaCO 3 , entered the flowering stage earlier and flowered about 15 days earlier than the control plants, while foliar spraying of nano ZnO delayed the flowering time. Foliar spraying during the growth period with nano CaCO 3 (500 mg L -1 ) increased the number of flowers per plant. Also, the number of flowers was 56.3 % higher than the control treatment. An increase in plant size was observed with the use of nano CaCO 3 . Highest flower diameter, plant height and leaf length in lisianthus were obtained by foliar spraying of nano CaCO 3 . The present study showed that calcium carbonate and zinc oxide nano fertilizers have a significant effect on growth characteristics and flowering quality of lisianthus.
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