Variations in soil and terrain resulted in variations not only in yields but in the areal distribution of crops. The sweet potatoe was the most ubiquitous of crops. It could be grown under a wide range of physical conditions but generally was found on the upland non-irrigable soils around the villages. Slips grown in the garden or in other plots were transplanted in fields prepared for sweet potatoes. The amount of rainfall, along with the amounts of salt-sea spray, were critical factors in the yield. Two crops could be grown in a year, though the crop grown in the relatively dry winter months was less abundant. .


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