关键词: 南荻炭, 土壤调理剂, 光合性能, 产量

Abstract: Leaf photosynthetic charateristics are material basis and determinants of crop yield formation. In order to explore the effects of applying M. lutarioriparius-derived biochar soil conditioner on rice yield-increasing, this paper conducted pot cultivation experiment; took indica two-line hybrid rice “Shenliangyou 5814” as test material; and studied the effects of applying Miscanthus lutarioriparius-derived biochar soil conditioners of 3 different treatments SC1, SC2, SC3 on rice heading date, leaf photosynthetic property and rice yield. Results showed that ① after applying M. lutarioriparius-derived biochar soil conditioner, the rice heading date was 4~12 d in advance, showing significant accelerating effect. Among the 3 soil conditioners, SC3 had the best accelerating effect. ② Compared with CK, after applying soil conditioner, rice Pn was significantly enhanced by 22.8％~62.4％. Soil conditioner SC2 had the most significant synergia effect. Besides, after applying soil conditioner SC1, Gs, Ci and Tr of rice leaf blades were markedly improved than those of CK by 57.0%, 8.2% and 18.2%, respectively. ③ The accumulation of photosynthetic related trace elements in rice leaves were significantly increased, the contents of Mg, Fe were increased by 22.79%～24.80%, 82.2%～89.8%, respectively. And there were no significant differences between these 3 soil conditioners (P>0.05). As for P content increasing effect, soil conditioner SC1 was obviousely higher than SC2 and SC3. ④ Compared with CK, rice yield increasing rate of these 3 soil conditioners could reach 24.2%～35.0%. Soil conditioner SC2 had the best yield increasing effect. In conclusion, applying M. lutarioriparius-derived biochar soil conditioner could advance rice heading date, improve rice photosynthetic efficiency, therefore promote the increase of rice yield.

Key words: Miscanthus lutarioriparius-derived biochar, soil conditioner, photosynthetic property, yield