2026-06-27http://hdl.handle.net/123456789/244292Summer rainfall areas are extensive in the tropical and subtropical zones of the world and account for a significant proportion of world food production. they are characterized by a limited period of adequate water supply for crop growth coinciding with high summer temperatures, and they tend to supper from high evapo-transpirational loss and year to year variability in rainfall amounts. Fertilizer use would give great scope for higher crop yields.46application/pdfFAOBook (stand-alone)