SATREPSマダガスカルプロ課題３「施肥と育種素材を統合した養分利用に優れた局所管理技術の開発」に参画するAung Zaw Oo特別研究員が、２月初旬から１ヵ月間、マダガスカルにてイネの生育調査を行いました。以下、成果の概要になります。

On-farm cultivation tests were started to verify the differences in the P-dipping effect between the fields in a total of 20 farmer fields with different phosphorus fixing capacities of soils. To clarify the effect of P-dipping on the early growth of rice, plant samples at 60 days after transplanting were collected from 12 selected hills per plot for further shoot analysis. Moreover, canopy photos collected at weekly interval by counterparts were analyzed to assess the P-dipping effect on the development of canopy coverage compared with other treatments. The results of the canopy analysis and biomass sampling highlighted that P-dipping accelerates early growth of rice compared to conventional P application and farmer practices, but the growth rate varies depending on the transplanting times and field conditions. Collected shoot biomass samples were prepared for further analysis of P concentration and P uptake by plant.