The humid and subhumid tropics in African regions where rainfall exceeds potential evapotranspiration for five months or more include most of the area from Guinea through central Africa plus the southern part of East Africa. They cover 12 million square kilometers, or 43 percent of the total land area, and include the humid forest zone of central Africa. Rainfall is over 1 thousand millimeters per annum.
It is generally recognized that Michigan's agricultural base is among the most diversified in the nation. Producing more than fifty varieties of commodities, the industry as a whole contributes more than $15 billion in value added to the state's economy. And in terms of employment, it is estimated that one out of every eight of the state's workers are engaged in agriculturally related activities.
Describes the characteristics of dairy production and processing in South Darfur and provides an analysis of the way in which pastoral families vary their diets according to seasonal food shortages and shifting terms of trade between milk and food grains.
Presents a theoritical outline of the techniques in the use of tritiated water (HTO) which can be used to estimate total body water, body composition, water turnover, milk intake and feed intake. Highlights its potential errors and gives a comprehensive methodology for the use of tritiated water under field conditions.
Given the monumental challenges facing today's world - widespread poverty, urban blight, illiteracy, tropical deforestation and the threat of nuclear war, to name only a few - it may seem quite irrelevant to devote an issue of Unasylva to the rather tame-sounding subject of urban forestry. To millions of homeless or starving or unemployed people in the urban centres of the developing world, how important can urban forestry really be? In truth, urban forestry, as sometimes practiced, does tend to benefit the well-to-do at the expense of the underprivileged.
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