Growth and Yield of Soybean as Influenced by Nitrogen and Growth Regulators

Field experiment was conducted at Millet breeding station, Tamil Nadu Agricultural University, Coimbatore, during kharif, 2007 to find out the effect of N and growth regulators on the growth and yield of soybean. The experiment was laid out in a randomized block design replicated thrice. The combinations of three N levels viz., 20kg N ha-1 , 30 kg N ha-1 and 40 kg N ha-1 as basal and three growth regulators viz., Salicylic acid @ 100 ppm, Ethrel @ 100 ppm and Chlormequat chloride @ 200 ppm were the treatments tried. The results of the experiment indicated that application of N @ 20 kg/ha as basal and foliar spraying of salicylic acid @100 ppm recorded significantly better growth, yield parameters and grain yield.