By C. R. W. Spedding (auth.)

It could were really easy to extend on the entire sections of the 1st variation yet i made a decision to attempt to keep the particularly brief, introductory nature of the e-book. a few new fabric has been extra, really the place it's been attainable to replace facts, and there was a few switch of emphasis in areas, to be able to mirror altering global stipulations. The ebook keeps its unique objective, notwithstanding, of introducing platforms pondering as utilized to agriculture. i'm thankful to Angela Hoxey for assist in getting ready this version, particularly when it comes to the education of tables and figures. C. R. W. SPEDDING v Preface to the 1st version the rural structures of the realm characterize a really huge topic. Their learn includes loads of really designated wisdom, in addition to a clutch of the constructions and services of the platforms themselves. This publication has been written as an creation to this kind of research and it concentrates on an total view, instead of at the element, partially due to the have to relate the latter to a couple greater photo that allows you to savour the relevance and value of the element. This problem-of seeing the relevance of part stories and the importance of actual, organic and fiscal element, and certainly principles-is encountered via many agricultural scholars correct before everything in their collage careers.

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It may also be adapted to the local pests, parasites and water supply and, above all, be able to live on the available feed supply, much of which may be derived from crop by-products. Similarly, a crop specialist might be tempted to 'improve' the crop 35 A SYSTEMS APPROACH TO AGRICULTURE Climate -----... Pests Wat~ rasites 1M~kJ"" By-products FIG. 16 Fertiliser The 'better' cow in the same environment as that of Fig. 15 with an indication of the milk yield it may be capable of if it survives. ).

Even so, the time involved is nothing like that required to make oil or coal. Not that there can be anything wrong with using up such stores: they benefit no-one if not used at all. But the rate at which they are used and the precise purposes for which they are employed need to be based on clear priorities if the supply is in danger of running out in the foreseeable future. Of course, other sources of energy (wind- or wave-power, nuclear fusion) may transform the situation, but until this can be guaranteed it will be necessary to consider the role of support energy in agriculture.

G. = Cost of grazed forage. = Labour costs. e. = Value of concentrates fed . = Fixed costs. Wt. = Weight of lamb carcasses. ,-- - _... ---- .... \ '. \ \ \ \ . ------. "'" " , " ", , , \ \ , I I I I I I \ \ \ \ \ \ , \ I ,,: (b) , '- ,, I I FIG. 12. The identification of a sub-system concerned with the effect of component number 12. (a) The sub-system identified by shading. (b) The sub-system extracted . 30 AN INTRODUCTION TO AGRICULTURAL SYSTEMS far as this system is concerned (and fixed by external influences).

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