Answers

2014-12-07T13:03:00+05:30
Icrisat deal with the semi arid crops which is in patancharu.it started many methods like water harvesting dry land farming etc.
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2014-12-08T19:52:50+05:30

Arid and semi-arid lands: Characteristics and importance

Arid and semi-arid or subhumid zones are characterized by low erratic rainfall of up to 700mm per annum, periodic droughts and different associations of vegetative cover and soils. Interannual rainfall varies from 50-100% in the arid zones of the world with averages of up to 350 mm. In the semi-arid zones, interannual rainfall varies from 20-50% with averages of up to 700 mm. Regarding livelihoods systems, in general, light pastoral use is possible in arid areas and rainfed agriculture is usually not possible. In the semi-arid areas agricultural harvests are likely to be irregular, although grazing is satisfactory (Goodin & Northington, 1985).

In Africa north of the equator, arid and semi-arid zones are bordered by Senegal, Upper Volta and Chad in the south; and Morocco, Algeria, Libya, and Egypt in the north. The zones extend southeast through Somalia and Northern Kenya, South of the equator the zones cover Lesotho, parts of the Cape, Northern Transvaal and Free State provinces of South Africa; Botswana; Namibia; and parts of Zimbabwe.

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