Interregional comparison of nitrogen dynamics of rice grown under aerobic culture

2016 Fiscal Year Final Research Report

• Project/Area Number: 26450018
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Crop production science
• Research Institution: Tokyo University of Agriculture and Technology (2016); Kyoto University (2014-2015)
• Principal Investigator: Katsura Keisuke 東京農工大学, (連合)農学研究科(研究院), 准教授 (20432338)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 畑栽培稲作 / 節水 / 窒素

Outline of Final Research Achievements

To reveal the factors causing low yielding of aerobic rice culture in tropical environment, multi-locational trials were conducted in Osaka, Japan and in Los Banos, the Philippines. Yield of rice under aerobic culture was significantly lower than under flooded culture in Los Banos, while there was no significant difference in yield among two water regimes in Osaka. There was a significant correlation between yield and nitrogen uptake rate of rice during vegetative stage. We found that N supply was enough but rice plants under aerobic culture could not uptake nitrogen efficiently in vegetative stage in Los Banos. In aerobic culture in Los Banos, irrigation water was applied frequently to avoid the decrease in soil water potential and soil compaction, which might lead nitrogen leaching when root system was not fully developed. These results suggest that development of efficient water and nutrient management was necessary for high yielding aerobic rice system in tropical environments.

Free Research Field

作物学