| Project/Area Number |
61480054
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
土壌・肥料
|
|---|
| Research Institution | HIROSHIMA UNIVERSITY |
|---|
Principal Investigator |
OGATA Shoitsu Prof. Faculty of Applied Biological Sciences, Hiroshima Univ., 生物生産学部, 教授 (70034436)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SANEOKA Hirofumi Assistant, 生物生産学部, 助手 (70162518)
KOUNO Kenji Assistant Prof., 生物生産学部, 助教授 (50034476)
FUJITA Kounosuke Assistant Prof. Faculty of Applied Biological Sciences, Hiroshima Univ., 生物生産学部, 助教授 (90002170)
|
|---|
| Project Period (FY) |
1986 – 1988
|
| Project Status |
Completed (Fiscal Year 1988)
|
| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥3,200,000 (Direct Cost: ¥3,200,000)
|
|---|
| Keywords | Cool Season Grass / Summer Depression Tolerance / Leaf Water Potential / Stomata Resistance / Total Root Length to Total Leaf Area Ratio / 細胞膜安定性 / 純同化率 / 気孔抵抗 / 総根長 / 總葉面積比 / 作物生長速度 / 夏枯れ耐性 / 養分吸収能 / 根系の発達 / ナフスチールアミン酸力 / TTC環元力 / 根組織のリグニン化 / 根組織の老化 / 水ストレス / 過湿 / 高温 / 根糸発達 / 根糸養分吸收 / 光合成能 / 夏枯れ抵抗性 |
|---|
| Research Abstract |
In the south west district of Japan, the productivies and durabilities of permanent grass-lands where cool season grasses have been suffered from summer depresoion after the ending of "Baiu".
It is very important how to control the cool season grasses from summer depression for their productivities and durabilities to be stable.
This project research has been carried out to evaluate summer depression tolerances of cool season grasses such Phleum pratense L., Agroslis albe. L., Dactilis glomerate L., and Festuca arundinacea Shr. including some legumes such Trifolium repens L., T. pratenes, and Medicago stat-iva L. cultivated on field and pot, from the view of comparative nutrio physiology.
The results obtained are shown as followings. After the ending of "Baiu", the summer depression has more severely appeared on the grasses of which root system developments have suppressed by the continuous high moisture content of soil during "Baiu" and the total root length to total leave area ratio of
… More
grasses tested is closely correlated the summer depression tolerance. The summer tolerance of grasses is higher as following order; F. arundinacea>A. alba>D. glomerata>P. pratenes and M. sativa,>T. repens>T. pratense. (2) The roots activities measured with the . naphtylamine oxydation and the TTC reduction method are generally higher in higher toleral grasses and legumes such F. arundinacea and M. sativa. (3) From the correlation curves between leaf water potentials and stomata resistances, a higher tolerance grasses higher stomata resistances with lower water potentials as contrast as the re-lation of these parameters of warm season grasses. (4) After ending of "Baiu", a higher tolerable grass has tended to fortity the cell membran sta-bility measured by the PEG test. (5) The summer depression of cool season grasses is generally resulted in the depression of potassium and phosphorous content.
From this result it is said that application of P and K might be carried in deeper soil layer to accelerate the root development and increase the K content of plant tissues, respectively. Less
|
