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Abstract
ABSTRACT
Two field experiments were conducted at El-Baramoon experimental farm of Mansoura Horticultural Research Station, Horticultural Research Institute (HRI), Agriculture Research Center (ARC) during 2006-2007 and 2007-2008 late fall seasons, on snap bean plants cv. Poulista. The study aimed to investigate the effect of some natural foliar applications to alleviate the adverse effects of low temperature stress (cold stress), yeast (5, 10 and 15 g/L), vitamin B (25, 50 and 75 ppm) and adinosin-tri-phosphate (ATP) (50,100 and 150 ppm) in two different planting dates (20th October and 10th November). The obtained results showed that, first planting date was superior to second ones, also, all applied treatments ameliorated cold stress effects and significantly enhanced all growth parameters (plant height, number of branches per plant, number of leaves per plant, leaf area, plant fresh weight and plant dry weight), increased the concentrations of leaf pigments (chl. a, chl. b, total chlorophyll and carotene), as well as mineral composition (N, P and K) of their plant foliage, also improved pod yield and pod quality. The adinosin-tri-phosphate (ATP) at (150 ppm) concentration gave the highest significant results in both planting dates in the two seasons, respectively.