Alternative irrigation: the promise of runoff agriculture by Christopher J Barrow PDF

By Christopher J Barrow

ISBN-10: 1853834963

ISBN-13: 9781853834967

An advent to runoff agriculture - a sort of agricultural irrigation - this article describes how using floor and subsurface water, usually neglected and wasted, allows either small farmers and advertisement agriculturists to enhance yields and the protection of harvest, even in harsh and distant environments. The textual content introduces the recommendations and techniques, in addition to the demanding situations and the potential for the an important strategy, that can give a contribution rather a lot to decreasing land degradation and bettering conservation and sustainability.

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I am also most grateful to the Library, University of Wales Swansea. 1). 0 billion, and it is unlikely to stabilize before reaching 11 billion and may reach 15 billion by AD 2050. Irrigated land increased roughly five-fold to around 235 million hectares between 1900 and 1992, so that by the early 1990s about 16 per cent of total cropland was ‘irrigated’ and gave approximately 36 per cent of total harvest. More than half of increased food production since 1970 has come from irrigated land (rough estimate) (Postel, 1992, p49; Srivastava et al, 1993, p13).

This is best achieved through land husbandry. This is more than efficient management: it is at least stewardship of resources and, ideally, their improvement while sustaining harvests. It is also something that should be achieved without unwanted impacts on surrounding or distant areas, cruelty to livestock, loss of biodiversity, or exploitation of agricultural employees. Hudson (1992, p9) made a plea for ‘a positive approach where Page 6 care and improvement of the land resource comes first, and control of erosion follows as a result of good land husbandry’ [Hudson's italics].

Is conflict likely between locals and nearby groups if there is improvement? Is there any chance of regional unrest? • What is access to market like (communications, distance, problems with transport, middle men)? • Have there been past failed attempts at improvement? • What do people need and what do they want? Sheet erosion is often difficult to recognize in practice; gully erosion is obvious and may divert attention from (i) and (ii). 1). It is possible to estimate the likely soil loss for a site under given landuse with empirical equations, such as the universal soil-loss equation (USLE) and its derivatives, through modelling or through field simulation experiments.

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Alternative irrigation: the promise of runoff agriculture by Christopher J Barrow


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