肥沃度センシング技術と養分欠乏耐性系統の開発を統合したアフリカ稲作における養分利用効率の飛躍的向上

現地圃場試験の開始

2020.01.17

現地圃場試験の開始

To test the P-dipping technique (seedling roots dipped in phosphorus added soil slurry) as a potential strategy to increase rice yield in the highlands of Madagascar, multi-field experiments were established in two different locations. Twenty lowland rice fields with different P retention conditions of soils at Behenjy and Antohobe were selected to compare P-dipping treatment with conventional P broadcasting and no P (farmer practice) application. The fields for early and normal planting times were transplanted and for late planting times are under way. The effect of P-dipping was clearly observed after two weeks of transplanting and it promoted early growth of rice compared to conventional P and no P application (farmer practice). Pot experiment was also conducted at laboratory of Radioisotopes (LRI), Antananarivo University, to assess the effect of seedling roots injury (roots pruning) to apply the P-dipping technique. We harvested all the pots after 35 days of transplanting and plant samples were taken for further measurement of shoot and root dry weight, and plant nutrient uptake.

Raising seedlings for multi-field experiments

Let’s plough the field together for planting

Farmers are good at experimental plot setting

Farmer is dipping seedlings in the slurry for
transplanting

Early response of rice to P-dipping technique.
(one of the early transplanting plots at Beheny)