| Project/Area Number |
02454059
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
土壌・肥料
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TAKAMURA Yasuo (1992) CENTER FOR AFRICAN AREA STUDIES DIVISION OF LIVELIHOOD STUDIES, PROFESSOR, アフリカ地域研究センター, 教授 (30026372)
荒木 茂 (1990-1991) 京都大学, アフリカ地域研究センター, 助教授 (00158734)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Jyunichi TOTTORI UNIVERSITY, FACULTY OF AGRICULTURE, ASSOCIATE PROFESSOR, 農学部, 助教授 (20032641)
高村 泰雄 京都大学, アフリカ地域研究センター, 教授 (30026372)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1991: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1990: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | low fertile soil / analysis of soil solution / drought tolerance / hollow fiber / bulrush millet / sorghum / maize / トウモロコシ / 耐干性 / ホロファイバ- / 土壌溶液 / 土壌水分 / 根圏土壌 / アフリカ土壌 |
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| Research Abstract |
This study was conducted to evaluate the drought tolerance of several field crops grown under the typical low fertile soil under the differentwater regime in Africa by an innovated continuous sampling system of soil solution, using the vinyl hollow fiber installed in the soil. Growth responses of young seedlings of bulrush millet, sorghum and maize to the different soil water condition as PF1,5 and PF 2,5, were measuredly the growth analysis method and the changes of nutrient concentration,i.e. N,P,K,Na,Mg and Ca etc. EC and PH, of soil water solution were an also anlysed using new sampling system.
The difference in drought tolerance among crop speceies used, was observed in terms of Top/Root ratios and the ratios decreased in the order of maize, sorghum and millet. The results also showed that the ion concentration of soil solution did not increase much while the effect of soil water deficiency on crop growth was observed. However, the decrease in both electric conductivity and K concentration was clearly ovserved at later stage of the growth experiment for every crop. The activity ratio of K (AR^k) was the highest for millet which corresponded with the high drought tolerance of the crop.
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