Leaf Spraying Paclobutrazol Improves Agronomic Traits and Yield of Soybean cv.Jinyi 31

In this study,soybean cv.Jinyi31 were leaf sprayed with 0,50,100,150,200,250,300 and 350 mg·kg-1 Paclobutrazol respectively at V6 in 2010 and 2011.Soybean yield increased from 2.22% to 21.97% under 50-350 mg·kg-1 Paclobutrazol,and the highest yield of 4175.40 kg·ha-1was obtained under 200 mg·kg-1 Paclobutrazol.Leaf spraying Paclobutrazol decreased podding height and plant height,shortened internode length,increased branches,pods and seed weight.Results suggest that 200 mg·kg-1 is optimal Paclobutrazol concentration for ameliorating agronomic traits agronomic and improving yield of soybean.