Effects of Different Fertilizer Levels and Planting Density on Super High-yield Soybean Liaodou 14

Super high-yield is an attractive research field recently as the soybean demand increases.However,the practice of super high-yield is difficult to be repeated as the lack of knowledge of cultivar and the management of super high-yield performance.To understand the specific performance of super high-yield cultivar,we compared the super high-yield cultivar Liaodou 14 and ordinary cultivar Liaodou 11 under different fertilizer levels(150,300 kg hm-2 (NH4)2HPO4)and planting densities(7.5,15.0,22.5×104 plants hm-2),the results showed that the plant height of super high-yield cultivar Liaodou 14 was stable under different treatments,and the plants had a lower height of lowest pod,and more branches under the higher fertilizer level.The LAI reached the maximum at podding stage,then decreased stably,and maintained a relative high LAI in the late stage of growth.Significant yield differences were observed among different plant densities,but no significant difference existed under different fertilizer levels.Super high-yield soybean Liaodou 14 can perform better only under the optimal management.