mededelingen der zittingen bulletin des seances - Royal Academy ...
mededelingen der zittingen bulletin des seances - Royal Academy ...
mededelingen der zittingen bulletin des seances - Royal Academy ...
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— 263 —<br />
Farm size<br />
51.1 land (32.8 ha)<br />
Residential p lo t .................................................................................................................. 0.25 ha<br />
Rotation crops and fallow : 5 plots x 0.2 h a ............................................................... 1.00 ha<br />
T otal...................................................................................................................................... 1.25 ha<br />
51.2 land (16.2 ha)<br />
Residential plot .................................................................................................................. 0.25 ha<br />
Rotation crops and fallow .............................................................................................. 1.20 ha<br />
T otal...................................................................................................................................... 1.45 ha<br />
The expected consumable yields are given in table 14. The results of the<br />
calculation of the energetic balances are summarized in table 15.<br />
Table 14<br />
Estimated crop yields un<strong>der</strong> traditional farming in the Masisi test area<br />
Crop Reference yield<br />
(kg/ha)<br />
Consumable yield (kg/ha)<br />
S l,l (100) S I,2 (79)<br />
Sweet potatoes 9,000 8,100 6,391<br />
W hite potatoes 10,000 8,100 6,010<br />
Beans 1,000 864 675<br />
Maize 1,200 1,053 827<br />
Sorghum 1,500 1,332 977<br />
Table 15<br />
N um ber of food portions of 2,220 Kcal produced per km 2 un<strong>der</strong> traditional farming<br />
in the Masisi test area<br />
Cultivable Farm Number Daily energetic Daily energetic Number of<br />
Suitability surface area size of farms value of the value of the food portions<br />
class farm suitability class of 2,220 Kcal<br />
(ha) (ha) (Kcalories) (Kcalories)<br />
S l,l 32.8 1.25 26.2 14,526 380,581 171.4<br />
S I,2 16.2 1.45 11.1 12,290 136,419 61.4<br />
Total/m ean 49.0 1.31 37.3 13,860 517,000 232.8<br />
Intensive farming<br />
Intensive farming on volcanic ash soils in a steep landscape requires adequate<br />
soil conservation practices. The fertility potential is high. The nearly saturated<br />
soil colloidal complex does not need any liming or K-application. The high<br />
organic matter content liberates important quantities of N through mineralization<br />
so that the requirement of N fertilizer is rather low. However, due
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