立丰灵对水稻抗倒性和产量性状的影响

观察水稻施用立丰灵后的节间形态、抗倒性及产量性状的生理效应,结果表明:①立丰灵抑制节间伸长期的纵向伸长,促进节间伸长期的横向生长,使节间外径增粗,秆壁加厚；②立丰灵通过矮缩节间减少弯曲力矩和增进节间粗厚度提高抗折力的双重作用,来降低倒伏指数,即增加抗倒力;③水稻倒4、倒3节间是最易倒伏的部位,因而,倒4、倒3节间的倒伏...

Effects of Lifengling on Lodging Resistance and Yield of Rice

Physiological effects of Lifengling,an anti-lodging agent,on internode’s morphology,lodging resistance and yield traits of rice were observed.The results showed that(1) Lifengling inhibited the longitudinal elongation of internodes,while promoted the latetudinal growth,resulting in the increases of internode’s diameter and stalk wall’s thickness;(2) it decreased lodging index(or,increased lodging resistance) through dwarfing the internodes to reduce bending torque and thichening the stalk walls to increase rigidity;(3) the lodging indices of the 3rd and 4th internodes from the top,which were most susceptable to lodging,were used to evaluate the rice plant’s overall resistance to lodging;and(4)when a rice plant was sprayed with 5% Lifengling at the rate of 600-750 g·hm-2 from 7 d before jointing stage till the jointing stage,the greatest lodging resistance was obtained,and at the same time,the most significantly improved grain development and yield for the rice plant acchieved.