连作晚稻夏季育秧期气温高,秧龄又长,因秧苗徒长,移栽时苗体过大,栽后败苗严重,不利于争季节创高产。自推广连晚杂交稻以来,上述问题更显突出。多效唑是一种新型植物生长延缓物质,有控制稻苗生长,促进秧田秧苗分蘖,防止移栽后败苗等效应,并有一定的增产效果。多效唑对连晚秧苗的控长促蘖效应与栽培、气温条件等有关,在一般连晚籼型杂交稻栽培条件下,一般其控长率可达30%,增蘖率可达50%;最适施用时期为一叶一心期,最适施用浓度为300ppm。 Even for late rice summer seedling raising temperature, seedling age and long, because of seedlings lengthened, transplanted seedling body is too large, seeding seedlings severely damaged, is not conducive to striving for a season of high yield. Since the promotion of late hybrid rice has been more prominent. Paclobutrazol is a new plant growth retarding substance, which has the effects of controlling the growth of rice seedlings, promoting the tillering of seedling seedlings and preventing the effects of seedlings after transplanting, and has the effect of increasing yield. The effects of PP333 on the long tillering effect of late seedlings were related to the cultivation and temperature conditions. Under the condition of normal continuous late indica hybrid rice cultivation, the control rate could reach 30% and the tillering rate could reach 50% Suitable for the period of a leaf a heart, the optimum concentration of 300ppm.