Effects of Lifengling on Lodging Resistance and Yield of Direct Sowing Rice with Two Application Doses of Nitrogen

The effects of plant growth regulator Lifengling on lodging resistance properties and yield of direct sowing rice was studied under different fertilization patterns.The tested rice variety of Y liangyou No.I was treated with 2fertilization patterns(high amount of nitrogen and appropriate amount of nitrogen)and at the same time,was sprayed with plant growth regulators Lifengling at 7days before jointing stage.The spray of regulators reduced the internode length from the fourth to the fifth node below ear and increased the stalk diameter and wall thickness,especially the fifth internode.It increased the breaking resistance while reduced the lodging index of rice significantly(P0.01)to strengthen the lodging resistance of rice.The application of the regulators increased the plant height,leaf width,and the angular separation between leaf and stalk,reduced the length of flag,second and third leaf,and improve the plant morphology.The thousand kernel weight,the number of grain per ear,and rice yield increased owing to the application of the regulator.The theoretical outcomes increased by 6.57% and7.03%(P0.01)compared with controls at high amount of nitrogen and appropriate amount of nitrogen,respectively.So spraying of Lifengling at 7day before jointing stage,combining with appropriate amount of nitrogen fertilization,would be an important cultivation practice to lodging resistance and high yield of direct sowing rice.