Deficit irrigation effects on growth, seed quantity and quality of castor bean under salicylic acid and sprmine treatments

An experiment was carried out to evaluate the effects of irrigation levels, based on fraction of the class A Pan evaporation 0.8, 1.00 and 1.20% of ECA and spraying of different amount of salicylic acid (250and 500 Mm) and sprmine (10 Mm And 1 mm) on grain yield and seed quality characteristics of castor bean in during 2012 seasons. The experiment was split plot as randomized completed block design with three replications. Drought stress significantly increased proline concentration and decreased grain yield and seed oil percent but had no effect on seed protein percentage. Salicylic acid and spermine treatments showed signification effects an all above traits. The highest proline concentration, seed protein percentage was obtained from 500 Mm salicylic acid and the highest grain yield was achieved from 250 Mm salicylic acid. The highest shoot dry matter was obtained 80 days after planting and crop growth rate and relative growth rate decreased with increasing water stress intensity. The grain yield and seed quality traits of castor bean were significantly higher under salicylic acid that sprmine treatments. It can be concluded that in castor bean production under drought stress, grain yield and seed quality could be improved by application of salicylic acid and sprmine.