How application of scientific knowledge has made agriculture possible in arid zones, dry lands and hills?
In the arid zone there is considerable scope for growing fruit trees like ber and pomegranate and fuel wood yielding trees like Acacia (Kikar), Prosopis (Mosquite) and Eucalyptus (Safeda). In such areas, large scale planting of shelter belts will minimize soil erosion caused by wind. It will also help in the establishment of pastures and grazing lands. Later on this land can be used for growing pearlmillet and mungbean.
Since water is a limiting factor in drylands, as much run off as posssible should be collected in community owned ponds, so that the crops can be gived life saving irrigation. In dry lands with red soil, deep ploughing helps in conserving water. In black soils, sowing two crops at a time is
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