Read e-book online An Introduction to Agricultural Geography PDF

By David Grigg

ISBN-10: 0203308255

ISBN-13: 9780203308257

ISBN-10: 0203419278

ISBN-13: 9780203419274

ISBN-10: 0415084423

ISBN-13: 9780415084420

Utilising approximately 1/2 the world's crew, agriculture is obviously of serious fiscal and social significance. a huge number of tools are used globally; the Western global has the newest clinical and commercial developments at its disposal, but within the Thrid international a dwelling is made utilizing instruments that experience infrequently replaced in thousand years. An advent to Agricultural Geography presents an intensive consultant via this varied and increaslingly vital geographical topic, aiming to teach wide selection of things clarify how agricultural practices vary from position to put. facing the actual atmosphere, monetary behaviour and calls for, institutional and social affects and the effect of farming upon the surroundings, the writer has produced an enormous introductory textual content that's topical, incisive and finally necessary to achieve an knowing of the notable range of the world's significant undefined.

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1) there is a relationship between water supply and crop yield, but it is not linear. 8). The distribution of mean annual rainfall is not a reliable guide to the possible location of crops, because not all the water is available to the plant; some is evaporated, some transpired. Evaporation rates in the tropics are some four times those in north-west Europe because of temperature differences, and so mean annual rainfalls in West Africa have to be above those in northern Europe to give equivalent soil moisture availability.

Farmers have to devise a system which will allow the removal of nutrients in the harvested crop and also maintain the soil nutrient content. It must also be recalled that crops have different requirements; some remove far more nutrients than others. The essence of successful farming is to find a way to harvest crops, which removes nutrients, while maintaining the soil-plant nutrient status. AN INTRODUCTION TO AGRICULTURAL GEOGRAPHY 45 FARMING SYSTEMS AND FERTILITY When natural vegetation occupies an area, there is a cycle of plant nutrients between the soil and the vegetation with little or no loss from the system; soil and vegetation are in equilibrium.

The limit of other crops was extended northwards in this period by the breeding of cold-resistant varieties. Both this northward extension, and the increase in yields between 1920 and 1940, were presumably assisted by the rise in mean annual temperatures experienced at this time, not only in Finland, but throughout the northern hemisphere. 7); but this was not due to the slight fall in mean annual temperatures that occurred in the 1950s and 1960s. In 1969 crop yields were still higher in the south than the north, but production costs were the same in each region, so that net return per 28 AN INTRODUCTION TO AGRICULTURAL GEOGRAPHY hectare was greater in the south.

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An Introduction to Agricultural Geography by David Grigg

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