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CRESCIMENTO E PRODUTIVIDADE DO MAMOEIRO FERTIRRIGADO COM DIFERENTES COMBINACOES DE FONTES NITROGENADAS   Tatyane Velasco Souza1; Vital Pedro da Silva Paz1; Eugenio Ferreira Coelho2; Francisco Adriano de Carvalho Pereira1; Carlos Alberto da Silva Ledo21Centro de Ciencias Agrarias, Universidade Federal da Bahia, Cruz das Almas, BA, tatyvelasco@gmail.com 2Embrapa Mandioca e Fruticultura Tropical, Cruz das Almas, BA, ecoelho@cnpmf.embrapa.br  1 RESUMO O trabalho teve como objetivo estudar os efeitos de diferentes combinacoes de fontes nitrogenadas (sulfato de amonio e nitrato de calcio), aplicadas via agua de irrigacao, sobre os componentes biometricos e de producao do mamoeiro Tainung n°1. O experimento foi desenvolvido no campo experimental da Embrapa Mandioca e Fruticultura Tropical, em Cruz das Almas, Bahia, no delineamento em blocos casualizados, com cinco tratamentos e cinco repeticoes. Foram obtidos dados biometricos (altura de planta, diâmetro de caule e area foliar) e de producao. Nao houve diferenca significativa entre as medias de crescimento e produtividade do mamoeiro nos diversos tratamentos, indicando nao haver diferenca entre as fontes nitrica e amoniacal para fertirrigacao. A substituicao do sulfato de amonio por nitrato de calcio como unica fonte nitrogenada para o mamoeiro promoveu um ganho de produtividade de 14,79%, elevando, porem, o custo de producao em 649,84%. A aplicacao de nitrogenio ao solo no periodo de 12 meses, considerando 50% do periodo com sulfato de amonio e 50% com de nitrato de calcio, nao causou acidificacao ou aumento do pH do solo. UNITERMOS: Fertirrigacao, parâmetros biometricos, produtividade.  SOUZA, T. V.; PAZ, V. P. da S.; COELHO, E. F.; PEREIRA, F. A. de C.; LEDO, C. A. da S. GROWTH AND YIELD OF PAPAYA UNDER COMBINATIONS OF NITROGEN SOURCES APPLIED BY IRRIGATION WATER  2 ABSTRACT The purpose of this work was to study the effects of different combinations of nitrogen sources (ammonium sulfate and calcium nitrate), applied by irrigation water, on biometric and production parameters of papaya cv. Tainung # 1. The experiment was carried out at Embrapa Cassava and Tropical Fruits, in Cruz dasAlmas,Bahia, under a randomized block design, with five treatments and five replications. Biometric data (plant height, stem diameter and leaf area) and production ones were collected. There was no significant difference among treatments, i.e., no difference between the nitrical and ammoniacal nitrogen sources at growth and production stages of the crop. The replacement of ammonium sulfate by calcium nitrate as the only nitrogen source for papaya provided a gain of 14.79% in yield, but the productions of cost increased 649.84%. The application of nitrogen to the soil during 12 months by ammonium sulfate during 50% of the period and calcium nitrate in the remaining did not cause acidification or increase of soil pH.KEYWORDS: Fertirrigation, growth parameters, productivity

CRESCIMENTO E PRODUTIVIDADE DO MAMOEIRO FERTIRRIGADO COM DIFERENTES COMBINAÇÕES DE FONTES NITROGENADAS