RESPONSE OF CHILE PEPPER (Capsicum annuum L.) TO SALT STRESS AND ORGANIC AND INORGANIC NITROGEN SOURCES: II. NITROGEN AND WATER USE EFFICIENCIES, AND SALT TOLERANCE (RESPUESTA DE PLANTAS DE CHILE (Capsicum annuum L.) AL ESTRÉS SALINO Y FUENTES ORGANICAS E INORGANICAS DE NITROGENO: II. EFICIENCIAS EN EL USO DEL AGUA Y DE NITROGENO Y TOLERANCIA A LAS SALES)

SUMMARY The response to two nitrogen sources on water and nitrogen use efficiencies, and tolerance of salt-stressed chile pepper plants ( Capsicum annuum L.) cv. Sandia was investigated in a greenhouse experiment. Low, moderate and high (1.5, 4.5, and 6.5 dS m -1 ) salinity levels, and two rates of organic-N fertilizer (120 and 200 kg ha -1 ) and 120 kg ha -1 of inorganic fertilizer as ammonium nitrate were arranged in randomized complete block designs replicated four times. The liquid organic-N source was an organic, extracted with water from grass clippings. Water use decreased about 19 and 30% in moderate and high salt-stressed plants. Water use efficiency decreased only in high salt-stressed plants. Nitrogen use efficiency decreased either by increased salinity or increased N rates. An apparent increase in salt tolerance was noted when plants were fertilized with organic-N source compared to that of inorganic-N source. Key words : green pepper; soil salinity; organic fertilizer; nitrogen use efficiency; water use efficiency; salt tolerance.