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N J COCHRANE
G R HOFFMAN AND R F STONER
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achieved agriculture amount applied arid Asia average Bangladesh become changes clay concentration constraints continuous costs crop cultivation demand depend determined developing countries discussed disease distributary distribution drainage drought economic effects efficiency electrolyte example exchangeable existing experiments extension factors farm farmers fertilizer field figure forces further given greater growing growth humid important improved increase inputs interaction International involved ions irrigation systems labour land less limited loss major maximum measurements methods nitrogen nutrients operation particularly percentage period permeability pest Philippines plant population possible potential practice present problems production progress Quirk recent reduced regions relation relatively requirements response result rice river root salinity salt schemes season sector selection shows situation sodium soil solution stage stress studies surface transpiration tropical unit varieties water supply World yield