Synergistic Effect of Indole Acetic Acid and Kinetin on Performance, Some Biochemical Constituents and Yield of Faba Bean Plant Grown under Newly Reclaimed Sandy Soil

Two field experiments were conducted at the Research and Production Station, National Research Centre, Nubaria Province, Behaira Governorate, Egypt during two successive winter seasons 2011/2012 and 2012/2013 to study the effect of indole acetic acid (IAA) at 0, 50 and 75 mg/l and kinetin (Kin) at 0, 50, 75 and 100 mg/l individually or in combination on two faba bean cultivars (Nubaria 1 and Giza 843). Results revealed that IAA and/or Kin treatments had positive effects on growth criteria (plant height, leaves number, fresh and dry weight per plant), photosynthetic pigments (chlorophyll a, b and carotenoids), total carbohydrate, polysaccharide, free amino acid, proline and total phenolic contents in the two cultivars. Furthermore, endogenous hormones (IAA, GA and zeatin) were increased concomitantly with decrease in ABA content 3 particularly at treatment of 50 mg/l IAA + 75 mg/l kinetin in the two cultivars. Seed yield and yield components (number of pods/plant, pods yield /plant, 100 seeds weight and biological yield/plant) as well as total carbohydrates and proteins in the yielded seeds were significantly improved at all treatments in the two cultivars. Meanwhile, vicine contents were significantly decreased at all treatments. It is worthy to mention that, performance of Nubaria 1 cultivar was more pronounced than that of Giza 843 cultivar when grown under newly reclaimed sandy soil conditions i.e. Under control treatment, seed yield/faddan (one faddan= 0.42 ha) of Nubaria 1 cultivar was 47.17% over that of Giza 843 cultivar. Meanwhile, response of Giza 843 cultivar to all applied treatments was more effective than Nubaria 1 cultivar.