BIOMASS AND CHLOROPLAST PIGMENTS IN JACKFRUIT SEEDLINGS UNDER SALINE STRESS AND NITROGEN FERTILIZATION

Authors

DOI:

https://doi.org/10.1590/1983-21252018v31n310rc

Keywords:

Artocarpus heterophyllus L.. Saline stress. Nitrogen fertilization.

Abstract

Irrigation with saline water is a worldwide necessity an excess of salts in water or in soil causes growth inhibition, and negatively affects the productivity of many crops. Application of nitrogen fertilizers may be a way of mitigating the effects of salts on plants. The aim of this study was to evaluate the accumulation of biomass and the chlorophyll pigment content in jackfruit seedlings irrigated with water of increasing salinity level in soil with nitrogen sources. The treatments were distributed in randomized blocks with four replicates and three plants per plot, arranged in a 5 × 3 factorial scheme, related to electrical conductivity levels of the irrigation water of 0.3, 1.0, 2.0, 3.0 and 4.0 dS m−1, in soil without nitrogen, with ammonium sulfate and with urea, in a split application 60 and 75 days after sowing. An increase in the salinity of the water increased the salinity levels of soil, which was intensified by a dose of 150 mg of N, mainly when applied in the form of ammonium sulfate, inhibiting dry matter production and chlorophyll content in jackfruit seedlings. The greatest reductions in chlorophyll a and b content occurred in jackfruit seedlings irrigated with water of 4.0 dS m−1 conductivity in the soil without nitrogen fertilization. Urea is the most suitable nitrogen source for the production of seedlings under conditions of high salinity.

Author Biography

  • Francisco Ítalo Fernandes de Oliveira, Post-Graduate Program in Soil Science, Universidade Federal Rural de Pernambuco, Recife, PE
    Técnico de Nível Médio em Agropecuária pela Escola Agrotécnica do Cajueiro - Universidade Estadual da Paraíba (UEPB/CCHA/CAMPUS IV), Catolé do Rocha - Paraíba (2009). Engenheiro Agrônomo pela Universidade Federal da Paraíba (UFPB/CCA/CAMPUS II), Areia - Paraíba (2014), onde foi Bolsista de Iniciação Científica (IC) do Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), no período de Fevereiro/2011 a Julho/2012 e Bolsista do Programa Institucional de Bolsas de Iniciação Científica da Universidade Federal da Paraíba (PIBIC/CNPq/UFPB), no período de Agosto/2012 a Julho/2014, sob orientação do Professor Dr. Lourival Ferreira Cavalcante. Em 2014 foi Laureado, com o segundo lugar do curso de Agronomia, pelo desempenho acadêmico. Mestre em Agronomia: Solos e Nutrição de Plantas (Área de concentração: Dinâmica do Solo e da água associada ao manejo do solo), da Universidade Federal do Ceará, sob orientação do Professor Dr. Claudivan Feitosa de Lacerda.

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Published

28-05-2018

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Section

Agronomy