Effects of Isolane and Lifengling on Lodging Resistance and Yield of Direct Sowing Rice

The effect of spraying Isolane and Lifengling on lodging resistance properties and yield of direct sowing rice was studied under different irrigation patterns.The tested rice variety of Y Liangyou No.1 was treated with two irrigation patterns(continuous irrigation of shallow water(CISW) and intermittent irrigation followed by shallow water(IISW) and at the same time,was sprayed with two plant growth regulators of isolane at 30 days after sowing and lifengling at 7 days.The spray of regulators reduced the internode length from the third to the fourth node below ear and increased the stalk diameter and wall thickness,especially the third and fourth internodes.Those increased the breaking resistance of rice(by 49.56% and 26.51% for the third and fourth internodes,respectively)while reduced the lodging index of rice by 27.27% and 12.33% to strengthen the lodging resistance,with a better result observed under IISW than CISW.Application of the two regulators increased the plant height,leaf width,and the angular separation between leaf and stalk,reduced the length of flag,the second and third leaves,and improved the plant morphology.The thousand kernel weight,the number of grains per ear and rice yield was increased owing to the application of these regulators.The theoretical and actual outcomes were increased by 3.83% and 4.41%(P0.01)compared with controls,with a better result observed also under IISW.So spray of isolane at 30 days after rice sowing and lifengling at 7 days before jointing stage,combined with appropriate irrigation patterns,would be a cultivation mode worthy of popularizing.