3. Conclusion
CO2 fertilization effect was found to be improved through exogenous application of Kinetin. Kinetin increases the sink capacity and stimulates biomass allocation to the grain filling thus improves the CFE on rice yield, however, the effect was rice cultivar dependent. In our previous studies, CFE on the brown rice yield in Koshihikari and Takanari was about 15%, however, here the CFE on the rough rice yield was only 11% at CN. These suggest that the CFE could be adjusted through Kinetin application. Optimizing of the application such as: surfactant, hormone quantities and spray timing, and hormone and rice cultivar selection need to be further studied to maximize the CFE.
Acknowledgements
This work was supported in part by the MAFF through “Development of Technologies for Mitigation and Adaptation to Climate Change in Agriculture, Forestry and Fisheries” and in part by the JSPS Grant-in-Aid for Scientific Research (A) (No. 26252004) and Grant-in-Aid for JSPS Fellows (No. 16F16096).