Effects of nitrogen management patterns on grain yield, solar radiant use efficiency in super hybrid rice

In order to explore the effects of different nitrogen management patterns on the solar radiation use efficiency (RUE) and yield of super rice, we used super hybrid rice Liangyou 293 (LY293) as the experimental material, and three nitrogen management patterns (seven applied nitrogen levels, N0 ∼ N6) were designed as the treatments. The result showed that leaf area index, total dry matter, solar radiation use efficiency and yield of super rice were increased as applied nitrogen rate increased. Grain yield of N6 is 9927.0 kg /hm2, about 4.8% to 33.5% higher than that of other treatments. But yield and interception photosynthetically active radiation (IPAR) amount of different treatments used different nitrogen management patterns decreased if applied N more than 210 kg /hm2. There is an extreme significant difference of total dry weight and RUE between treatment N6 and other treatments. Total dry weight and RUE by N6-treatments were are 1853.7 g /m2and 1.59 g /MJ, respectively, which were higher than that of the other treatments. (authors)