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achieved agric alfisol applied arid lands Asia Bafios Bangladesh calcium clay constraints costs crop production cultivation developing countries distributary drainage drip irrigation drought dry matter economic effects efficiency electrolyte evaporation evapotranspiration example exchangeable sodium factors farm fertilizer figure flooded greater growth hectare humid important improved increase Indonesia inputs interaction ions irrigated agriculture irrigated area irrigated crops irrigation development irrigation schemes irrigation systems irrigation water labour leaching maize maximum meq dm-3 methods moisture stress montmorillonite nitrogen nutrients particles Penman percentage permeability Philippines photosynthesis plant breeding population problems Quirk rain-fed rainfall ratio reduced relation result rice rice production Rothamsted Rothamsted Experimental Station salinity salt season sector sodium solution sorghum sprinkler surface threshold concentration transpiration tropical tube-well upland uptake varieties vertisol Washington D.C water management water requirements water stress water supply wheat World Bank yield potential