00722nam a2200229 a 450000100080000000500110000800800410001910000180006024501170007826000360019530000100023150001040024152000470034565000090039265000100040165000130041165000090042465000100043365300090044365300230045270000170047519323922024-07-18 1982 bl uuuu u0uu1 u #d1 aSHARMA, P. N. aResearch strategy for the improvement of land and water resources of the semi-arid tropics of North-East Brazil. aPetrolina: EMBRAPA-CPATSAc1982 a19 p. aTrabalho apresentado no 1º Simpósio Brasileiro do Trópico Sem-Árido, Olinda,PE, agosto de 1982. aClimate; Soils; Socio-economic conditions. aSoil aÁgua aPesquisa aSolo aTerra aIICA aRecursos hídricos1 aPORTO, E. R.