关键词: 超级早稻, 磷肥用量, 产量, 磷肥利用率

Abstract: In order to study the effects of different phosphorus content on growth, yield and nitrogen and phosphorus uptake of super early rice, a field experiment was conducted in 2012 with super rice Zhongzao 39 and conventional rice Jinzao 09 as materials. The results showed that the biomass of Zhongzao 39 was significantly lower than Jinzao 09 under P0 and P1 treatments at mid-tiller stage. However, the biomass and yield of Zhongzao 39 was significantly higher than Jinzao 09 among all phosphorus treatments at heading and maturity stage. The panicle number of two varieties increased significantly after phosphorus application, but the panicle number of Zhongzao 39 was no significant difference between P1 and P2. The nitrogen and phosphorus uptake, phosphorus recovery efficiency, and partial factor productivity of applied phosphorus of Zhongzao 39 was higher than Jinzao 09, but the phosphorus agronomic efficiency of Zhongzao 39 was lower than Jinzao 09. With phosphorus rates increasing, the increasing percentage of panicle and yield of Zhongzao 39 was lower than Jinzao 09, and the decreasing percentage of phosphorus recovery efficiency, phosphorus agronomic efficiency and partial factor productivity of applied phosphorus of Zhongzao 39 was higher than Jinzao 09. In conclusion, Zhongzao 39 was lower phosphorus sensitive than Jinzao 09, and 30 kg/hm2 phosphorus applied level was better choice for Zhongzao 39.

Key words: super early rice, phosphorus application rate, yield, phosphorus efficiency