杂交中籼稻药剂防倒伏技术的初步研究

目的]探讨杂交中籼稻喷施植物生长延缓剂立丰灵的应用方法和效果。方法]多点试验中，以丰两优3号、新两优6号和扬两优6号为试材，5％立丰灵粉剂的用药剂量设3个处理：300、600和900g／hm^2，在水稻拔节前10d进行喷施，同时以15％多效唑150g/hm^2制剂为对照用药，清水处理为空白对照，研究杂交中籼稻的药剂防倒伏技术。结果]施用5％立丰灵使植株明显矮化，药效长达25～30d，且随着剂量的加大，矮化作用越显著，显著降低倒伏指数。喷施300和600g/hm^2剂量的立丰灵可有效促进幼穗发育，使出穗提前2～4d，增加每穗粒数，增产3．0％～8．5％，但达到900g／hm^2的剂量，则表现减产。结论]在同等条件下，施用5％立丰灵600g／hm^2的处理，既有显著矮化抗倒效应，又能促进穗粒发育，增产效果显著：

Preliminary Study on Lodging-resistance Technique with Medicament in Medium Indica Hybrid Rice

Objective] The study aimed to discuss the method and effect of spraying the plant growth retardant Lifengling on medium indica hybrid rice.Method] In the muti-site test,with Fengliangyou 3,Xinliangyou 6 and Yangliangyou 6 as the tested materials,3 dosage treatments of 5% Lifengling powder were set up as 300,600 and 900 g/hm2 to spray on the medium indica hybrid rice in 10 d before the rice jointing.15% Paclobutrazol at 150 g/hm2 was used as the CK medicament and the clear water was used as the blank CK,an...