成果の概要

Aiming to improve further the localized P-dipping effect on rice growth and grain yield, we evaluated the interaction effect of P-dipping and rice genotypes with different root system architecture in farmers’ fields in two rice-growing regions of Madagascar. Field observations and visual assessments were conducted at both study sites with local counterparts, and field harvesting, and sampling were performed sequentially from early maturing plots using P-dipping. To further elucidate the underlying mechanism of the interaction effect between the P application and the rice genotypes, the collected soil solution and root samples from different soil layers were analyzed at Radioisotopes Laboratory (LRI), Antananarivo University, during the mission.