Download An Introduction to Agricultural Geography by David Grigg PDF

By David Grigg

Using approximately half the world's crew, agriculture is obviously of significant financial and social significance. an immense number of equipment are used globally; the Western international has the newest clinical and commercial developments at its disposal, but within the Thrid international a residing is made utilizing instruments that experience infrequently replaced in thousand years. An creation to Agricultural Geography offers an in depth advisor via this assorted and increaslingly vital geographical topic, aiming to teach wide selection of things clarify how agricultural practices fluctuate from position to put. facing the actual surroundings, financial behaviour and calls for, institutional and social impacts and the effect of farming upon the surroundings, the writer has produced an enormous introductory textual content that's topical, incisive and eventually necessary to achieve an figuring out of the amazing range of the world's significant undefined.

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Inputs of fertilizer obtain a better yield response on good soils than upon poor soils. Thus, in the USA corn production has been slowly concentrating in the regions widi optimum soil and climate, and declining elsewhere. This requires not only fertilizers but good conditions that allow such regional specialization. SOIL CHARACTERISTICS AND AGRICULTURE An important characteristic of a soil is its depth. Many parts of the world suffer from too shallow soils, both in arid regions and in areas such as the Canadian Shield where glaciation has removed the soil, leaving only AN INTRODUCTION TO AGRICULTURAL GEOGRAPHY 43 bare rock.

But, for all these qualifying remarks, climatic differences are the main determinant of differences in crop distribution on a world scale. Speed, ‘Climate and cropping systems in West Africa’, Geoforum, 1981, vol. 12, pp. Baker, ‘The potential supply of wheat’, Economic Geography, 1925, vol. 1, pp. 15–52. Barrow, Water Resources and Agricultural Development in the Tropics, Harlow, Longman, 1987. Bayliss-Smith, The Ecology of Agricultural Systems, Cambridge, Cambridge University Press, 1982. Courtney, Agriculture and Environment, The Physical Geography of Temperate Agricultural Systems, London, Longman, 1985.

Yields are 5 tonnes per hectare, but they decline away from this zone, and eventually climate conditions are so adverse that no growth occurs and the yield is zero. This is the absolute limit of cultivation. However, farmers are not likely to cultivate the crop near the absolute limit, for economic as well as ecological factors determine where a crop is grown. Suppose the price received for the crop is £100 per tonne, and the cost of production (the same everywhere) is £150 per hectare. 2), and profit per hectare will also decline away from the optimum zone.

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