不同水肥模式的水稻叶面积修正系数试验研究

he leaf area correcting coefficient is the key parameter of the length-width method for rice leaf area measurement. The leaf area correcting coefficients were calculated based on the measurement of rice leaf area,leaf length and width to explore the impact of water and fertilizer management for them. The upper leaf area correction coefficients of controlled irrigation managements were lower than the ones of the traditional irrigation. Correcting coefficients went down with the continuation of the growth period.They were focused on 0.7 at the heading and flowering stage, lower than the accustomed 0.75. Correcting coefficients of controlled-release fertilizer management were lower than the others. The accustomed correcting coefficients(0.75) could be used in the prophase of rice for the farmers′ fertilization and site-specific nutrient management.In the heading and flowering stage, the same correcting coefficients could be used to calculate the rice leaf area for the different managements. The correcting coefficients were the lowest in the middle term of the rice growth-period.