Abstract
This study was carried out at the Experimental Station and Laboratory of Vegetable& Floriculture department, Fac. of Agriculture, Mansoura University during the two successive seasons of 2011/ 2012 and 2012/ 2013.It aimed to study the effect of monthly treatments of NPK rates (0, 1.5, 3.0, 4.5 g /plant) and foliar spray with GA3 at 100 ppm and yeast at 5 g /l either alone or in combination from the 1st of April to the 1st of September on growth of containerized magnolia (Magnolia grandiflora L.) tree transplants. The results showed that GA3 spray was the most effective compound to improving all growth parameters of magnolia transplants, followed by yeast spray, while mineral fertilization was the third in order. Among fertilizer treatments, the medium fertilizer level 3g/pot was optimum for growth of magnolia transplants. Monthly fertilization with Hyper feed NPK (19:19:19) fertilizer at 3 g/pot combined with foliar spray of both GA3 at 100 ppm and yeast at 5 g/l resulted in the highest significant values for plant height, stem diameter, number of leaves per plant, leaf area and fresh and dry weights of plant, fresh and dry weights of magnolia transplants. Data also showed that the previously mentioned combination resulted in the highest contents of N, P, K, carbohydrates, and chlorophyll in magnolia leaves.
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