Published in Scientific Papers. Series B, Horticulture, Volume LVIII
Written by Behzad KAVIANI, Naser NEGAHDAR, Mohammad Vali FAKOURI GHAZIANI
The successful application of various Nano-platforms in medicine under in vitro conditions has generated some interest in agro-nanotechnology. This technology holds the promise of controlled release of agrochemicals and site targeted delivery to improve efficient nutrient utilization and enhanced plant growth. Nano-encapsulation shows the benefit of more efficient use and safer handling of pesticides with less exposure to the environment. Thus, nano-fertilizers can be substituted for conventional fertilizers. Growth reduction in some ornamental plants enhance their overall quality. Cycocel is one of the most important growth retardants which inhibits gibberellin. These experiments were carried out based on a randomized complete block design in three replications to evaluate the effect of various levels of nano iron chelated fertilizer and cycocel on growth parameters of Euphorbia pulcherrima. Treatments were Fe chelated fertilizer (0, 0.9, 1.8, 3.6 and 4.5 g l-1) and Cycocel (0, 500, 1000, 1500 and 3000 mg l-1). Plant height, internode length, shoot number, node number, root length, root number, the length of longest root, the length of shortest root, root volume, fresh and dry weight of root and shoot, leaf number, leaf surface, leaf chlorophyll content, measurement of iron in leaf and the number and permanent of bracts were evaluated. The least plant height and the most shoot, leaf number, root length, root volume, the number and permanent of color bracts were obtained in treatments of 1.8 g l-1 iron nanofertilizer without or with the concentration of 1000 mg l-1 cycocel. The most leaf surface, which is a good trait, was calculated in plants treated with 1.8 g l-1 iron nano-fertilizer without Cycocel. In some traits such as root volume and chlorophyll content, the minimum amount was seen in the maximum of iron nano-fertilizer and cycocel concentrations. Suitable root characters were severely reduced under the effect of 3000 mg l-1 cycocel. Overall, the most suitable treatment, especially for reduction of plant height and enhancing some vegetative traits (such as leaf number) and flowering (such as permanent of bract) is introduced in treatment of 1.8 g l-1 iron nano-fertilizer along with 1000 mg l-1 Cycocel.
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