Titlebook: An Introduction to Agricultural Systems; C. R. W. Spedding Book 1988Latest edition Elsevier Applied Science Publishers Ltd 1988 agricultur

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The Purposes of Agriculture, can be called agricultural, but this is not good enough if we are seriously interested in topics such as the role of science in agriculture, the role and importance of agriculture in the world and how agricultural efficiency can be improved.

流行

A Systems Approach to Agriculture,lled enterprises, farms, plantations, regional and national agricultures. It is useful to have a term of this kind that does not imply a particular size or level of organisation. After all, the essential activity does not imply anything of this kind and it is desirable to be able to discuss operatio

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The Contribution of Science,ole in their improvement. However, orthodox science subjects also contain relationships that can only be quantified in a statistical sense, so that prediction is concerned with an estimate of probability.

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Subsistence Farming and Shifting Cultivation,quite common, especially in the tropics. People worked for relatively few hours each week, produced only what they required, collected fuel from the surrounding areas and played little part in the cash economy.

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Mixed Farming Systems,, so it would seem that a very high proportion of the world’s agriculture could be said to be engaged in mixed farming. This is not a very helpful view, however, and it is more useful to confine the term to situations where crop and livestock production are integrated.

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Crop Production Systems,ion, to serve amenity purposes (lawns, flowers, trees and shrubs) and to increase soil fertility (e.g. by adding organic matter from senescent leaves and roots or nitrogen from decaying legume nodules).

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Animal Production Systems,that give rise to products of major importance are listed in Table 12.1. Many of them also produce valuable by-products such as offals, bone meal, dung (used for fuel and the construction of huts), hair, feathers and glue; and some of them are also used for transport and traction. In many parts of t