By David Grigg
Applying approximately half the world's crew, agriculture is obviously of serious monetary and social value. an enormous number of tools are used globally; the Western global has the most recent medical and commercial developments at its disposal, but within the Thrid global a dwelling is made utilizing instruments that experience hardly ever replaced in thousand years. An creation to Agricultural Geography presents an in depth advisor via this assorted and increaslingly very important geographical topic, aiming to teach wide selection of things clarify how agricultural practices fluctuate from position to put. facing the actual setting, monetary behaviour and calls for, institutional and social impacts and the impression of farming upon the surroundings, the writer has produced a tremendous introductory textual content that's topical, incisive and finally necessary to succeed in an knowing of the impressive range of the world's significant undefined.
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Extra resources for An Introduction to Agricultural Geography
Varjo, ‘Productivity and fluctuating limits of crop cultivation in Finland’, Geographica Polonica, 1979, vol. 40, pp. Wiesner, Climate, Irrigation and Agriculture, Sydney, Angus and Robertson, 1970, p. 90 MOISTURE Soil moisture is essential to plant growth for without water plants wilt and the, and plant nutrients cannot be taken up by the crop. Moisture affects crop growth in two ways. First, crops differ greatly in the amount of water needed to give optimum yields. Wheat and rye for example, can be grown in areas where annual rainfall is between 25 cm and 100 cm, but rubber needs over 178 cm and tea over 254 cm.
As acidity increases the nitrogen-fixing bacteria in the soil are reduced, and so are the soil organisms that improve structure and texture. Crops vary in their optimum pH requirements, but there are few 44 SOILS AND THE FARMER that thrive in highly acid or highly alkaline conditions; most prefer a neutral or slightly acid soil. 1). However, acid soils can be limed and the drawback overcome. Highly alkaline soils are rare in temperate regions but common in semi-arid areas and those irrigated areas which have water-logged soils.
In addition, poorly-drained soils are easily damaged by the hooves of animals and compacted by heavy machinery. In spring the sun’s energy is used drying-out the wet soil rather than warming it, so that the beginning of the growing season is retarded. In autumn, clay soils are difficult to cultivate in wet years (see above, p. 34). Clay soils have two advantages which, however, are of less significance under modern farming conditions. The large clay fraction slowly releases potassium so that they suffer less than other soils from potash deficiencies, and their water-retaining capacity means that they give above average yields in very dry years.