7 km mm/ 300 mm 300 mm 20 m/s 10 m/s % 12 12% 13 13% Arenosols Arenosols m 50

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ゆゆこあさま
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1 taki kasa leso Leso lesofoko Foko leso fokokasa leso foko kasataki 1970,,, 49

2 7 km mm/ 300 mm 300 mm 20 m/s 10 m/s % 12 12% 13 13% Arenosols Arenosols m 50

3 51 Vol.10 No m taki taki taki kg

4 A ,500 CFA = kg 12,000 CFA 120 zongokolo dogo hatsi maiwa bazaumi zongokolo dogo hatsi bazaumi maiwa zongokolo maiwa dogo hatsi zongokolo bazaumi maiwa 11 Maiwa Cassia mimosoides Andropogon gayanus Merremia angustifolia hauya m m 5 cm Hayashi et al. 11 kasa fara kasa ja kasa masara kasakasa taki leso Leso leso leso taki leso 52

Vol.10 No. 49 57 2005 leso Leso foko X foko 87.

2.25 m 2 1.5 m 1.5 m 4 m 2 5 kg 12.5 t/ha 50 kg 125 t/ha kasa 2.

5 Vol.10 No leso Leso foko X foko 87.1% leso foko kasa 3 leso foko kasa leso foko taki m 2 2 m 2 m 2.25 m m 1.5 m 4 m 2 5 kg 12.5 t/ha 50 kg 125 t/ha kasa 2.25 m 2 5YR 7/ kg/cm kg/cm kg/cm cm 40 5YR 4/6 kasa ja kasa gara 53

12.6 kg/cm 2 4.9 kg/cm 2 64.1 kg/cm 2 4 mm 11 40 5YR 7/3 42.3 kg/cm 2 5YR 6/6 19.4 kg/cm 2 Digitaria debilis 3 cm Balanites aegyptiaca 2.7 3.3 cm 5.0 6.8 cm 5YR 4/2 9.0 kg/cm 2 D.

6 12.6 kg/cm kg/cm kg/cm 2 4 mm YR 7/ kg/cm 2 5YR 6/ kg/cm 2 Digitaria debilis 3 cm Balanites aegyptiaca cm cm 5YR 4/2 9.0 kg/cm 2 D.debilis Triumfetta pentandra Cassia mimosoides 22 D.debilis cm 45.8 kg/cm 2 D. debilis 4.2 cm TDR 15 cm m kg = 140 t/ha cm 2.5YR 3/ cm 3.2 kg/cm kg/cm kg/cm %15% 54

Vol.10 No. 49 57 2005 20 mm 7.6% 21.8%29.4% 1.9% 11.0% 12.9% 13 26 mm 10.

7 Vol.10 No mm 7.6% 21.8%29.4% 1.9% 11.0% 12.9% mm 10.1% 23 5 mm mm 2%12 28 mm 6.5% 40.5 mm 14.2% kasa leso foko taki kasa leso foko Leso foko 12 leso foko kasa leso leso foko 55

8 foko,13 14, ,18 taki 19 A S B B X Ser.A 2, TOTO

9 Vol.10 No TOTO FAO/UNESCO 1971 Soil map of the world 1:5,000,000. Rome, UNESCO. Hayashi, K., O. Fashola, T. Masunaga and T. Wakatsuki 2000 Indigenous soil knowledge for sustainable agricultural development in the Sahel zone of Niger, West Africa 1. Soil quality characterization of a small inland valley watershed. Tropics, 9 4, Baier, S An economic history of central Niger. Oxford Studies in African Affairs, Oxford, Clarendon Press. Oyama, S Agriculture and grazing in the arid environment of Sahel: subsistence economy of Hausa cultivators in southern Niger. In: Hori, N., eds., Human Response to drastic change of environments in Africa II, Tokyo Metropolitan University, TOTO Hayashi, K., O. Fashola, T. Masunaga and T. Wakatsuki 2000 Indigenous soil knowledge for sustainable agricultural development in the Sahel zone of Niger, West Africa 2. Indigenous soil classification system. Tropics, 9 4, Orr, B Natural forest management in Sahelian ecosystems of southern Niger. Journal of Arid Environments, 30, Harris, F Nutrient management strategies of small-holder farmers in a short-fallow farming system in north-east Nigeria. The Geographical Journal, 165 3, Ayantunde, A. A Herder's perceptions, practice, and problems of night grazing in the Sahel: Case studies from Niger. Human Ecology, 28 1, Bagine, R. K. N Soil translocation by termites of the genus Odontotemes Holmgren Isoptera: Macrotermitinae in an arid area of Northern Kenya. Oecologia, 64, Benemann, J. R Nitrogen fixation in termites. Science, 181,

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) km 200 m ) ) ) ) ) ) ) kg kg ) 017 x y x 2 y 5x 5 y ) 001 ) g 20 g 5 300 g 7 002 720 g 2 ) g 003 0.8 m 2 ) cm 2 004 12 15 1 3 1 ) 005 5 0.8 0.4 ) 6 006 5 2 3 66 ) 007 1 700 12 ) 008 0.315 ) 009 500 g ) kg 0.2 t 189 kg 17.1 kg 010 5 1 2 cm 3 cm )km 2-1 - 011