| Project/Area Number |
25850042
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Plant nutrition/Soil science
|
|---|
| Research Institution | Akita Prefectural University |
|---|
Principal Investigator |
Takakai Fumiaki 秋田県立大学, 生物資源科学部, 助教 (30451420)
|
|---|
| Project Period (FY) |
2013-04-01 – 2017-03-31
|
| Project Status |
Completed (Fiscal Year 2016)
|
| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
|---|
| Keywords | 田畑輪換 / 窒素動態 / 土壌窒素肥沃度 / 重窒素 / 水稲 / ダイズ |
|---|
| Outline of Final Research Achievements |
In this study, the fate of nitrogen (N) derived from organic materials applied to paddy fields under paddy-upland rotation (plant uptake or remaining in soil) were evaluated for a long term by the 15N-tracer method.
The N derived from organic materials (hairy vetch [green manure] and cattle manure compost) applied to the rice paddy and upland soybean fields in the first year had been continuously utilized for five years (38-45% and 10-12% of applied N, respectively), and were partly remained in the soil after five years of application (35% and 60% of applied N, respectively).
Compared to the soybean cultivation, uptake rates of available N derived from materials in the soil and the amounts of uptake N derived from preceding applied organic materials were higher in the rice cultivation. Consequently, fertility management taking history of organic matter application into consideration is required for the timing of rice cultivation.
|
