The effects of Jinzhengda slow-release nitrogen fertilizer(SRNF) on internodes length and lodging resistance of super-rice were studied by using varieties of 88S/1128(88S) and Zhunliangyou-527(Z-527) as experimental material.The results showed that as the SRNF fertilization increased, for the length of the fifth internode countdown from the top (top-5th, the following abbreviation showed the corresponding internodes) and top-4th, which were on the lower part of the rice stem, both of the two varieties increased.Under the same utilization content of nitrogen, the length of top-5th and top-4th of variety 88S were shorter than variety Z-527 by 35％ and 30％ respectively, and the middle internodes of top-3rd were shorter by 12％.On the contrary top-2nd and top-1st were longer by 8％ and 2％ respectively.The two varieties differed in internodes structure.The fracture resistance force of all internodes of two varieties decreased as the SRNF increasing, but every internodes of 88S was larger than the corresponding internodes of Z-527 under the same utilization content of nitrogen.The lodging resistance of 88S was better than Z-527.All of the lodging index of top-5th and top-4th of 88S were below 200 and no lodging occurred.However, Z-527 under nitrogen treatment of 270 or 315 kg/hm2 were more than 200 and lodging appeared in the maturity period.%以超级稻组合88S/1128和准两优527为试验材料,研究金正大缓释氮对超级稻的节间结构和抗倒性的影响.结果表明,随着氮用量的增加,两品种基部的倒5和倒4节间长度均增加;在0～315 kg/hm2施氮处理下,组合88S/1128比准两优527的基部倒5和倒4节间分别短35%和30%,中部倒3节间短12%,相反,上部的倒2、倒1节间分别长8%和2%,表现出不同的节间结构.随着施氮量的增加,两品种的各节间的抗折力下降,组合88S/1128在各种氮素水平下抗折力均大于准两优527,表现出强的抗倒伏能力;组合88S/1128的基部节间倒伏指数均在200以下,没有倒伏,而准两优527在270、315 kg/hm2施氮量下大都大于200,成熟期出现倒伏.
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