| Project/Area Number |
24780013
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Crop science/Weed science
|
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
ARAKI Takuya 愛媛大学, 農学部, 准教授 (10363326)
|
|---|
| Project Period (FY) |
2012-04-01 – 2015-03-31
|
| Project Status |
Completed (Fiscal Year 2014)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| Keywords | イネ / アンモニア態窒素 / 硝酸態窒素 / 乾物生産 / 窒素吸収 / 無機態窒素 / 総根長 |
|---|
| Outline of Final Research Achievements |
Ammonium-nitrogen is considered main nitrogen nutrition for cultivated rice (Oryza sativa L.). However, with changeable irrigation by “alternate wet and drainage” in lowland, role of nitrate-nitrogen form in paddy rice attracted more attention. To obtain high yield, nitrogenous inorganic fertilizer has been applied increasingly, resulting in detrimental impacts on environment. Therefore, improving nitrogen use efficiency of rice with decreasing inorganic nitrogen application should be concerned. Total dry weight, nitrogen transport rate and root length were found the highest under the condition of 40% ammonium and 60% nitrate. These parameters of 100% nitrate showed higher value than those of 100% ammonium. Any ecotype, japonica, indica and tropical, grown under 100% nitrate showed better growth than that under 100% ammonium.
|
