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Determination of Suitable Pre-sowing Seed Treatments and Fertilizer Doses for Mass Production of Quality Nursery Stock of Oroxylum indicum

Oroxylum indicum, commonly known as ‘Shyonak’, Shivnak’ or ‘Indian trumpet flower’, is an important medicinal tree found in India and South East Asia. Various parts of this tree possess immense medicinal properties, which are utilized to cure various diseases. Being highly valuable source of medicinal formulations, this tree is overexploited and is listed as vulnerable and endangered in saveral parts of India. So, there is an urgent need for conservation of this species through mass multiplication. With the objective to produce good quality nursery stock of Oroxylum indicum, the present study was conducted to test the effect of different pre-sowing seeds treatments on seed germination along with the effect of different fertilizer doses for production of good quality seedlings in the nursery. The study revealed that treatment of soaking seeds in water for twelve hours resulted in highest germination per cent (64.44%) and also exhibited better growth parameters of the seedlings than that in the control. Effect of different fertilizers viz. Neem coated urea, Potassium Nitrate, Calcium nitrate and Ammonium Sulphate was studied on the seedlings, where the highest growth (21.42% increase in height) was recorded in application of Neem coated urea at a dose of 3.5 g/l.