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      IMPACT OF SALINE CONDITIONS AND NITROGEN FERTILIZATION ON CITRUS PRODUCTION AND GAS EXCHANGES Translated title: TROCAS GASOSAS E PRODUÇÃO DE CITROS IRRIGADOS COM ÁGUAS SALINAS E ADUBAÇÃO NITROGENADA

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          Abstract

          ABSTRACT: In two simultaneous experiments, we evaluated the impact of brackish irrigation water and nitrogen (N) fertilization on the production of citrus (scion-rootstock combinations) and its associated gas exchanges. These experiments were conducted at the Campus of Federal University of Campina Grande, Brazil in a protected environment (shade screens on the sides) using drainage lysimeters. Experiment I used a randomized block design (3 replicates), in a 5 × 3 factorial arrangement, corresponding to five water salinity levels (0.6, 1.2, 1.8, 2.4, and 3.0 dS m-1) and three scion-rootstock combinations: RS1- Common Sunki mandarin (TSKC) × Poncirus trifoliata English (TRENG) - 256; RS2- Common Rangpur lime (LCRSTC); and RS3- TSKC × (Rangpur lime (LCR) × P. trifoliata (TR)) - 059; with Mimo do Céu orange as the scion variety. Experiment II used a randomized block design (3 replicates), in a 3 × 2 factorial arrangement, corresponding to the three scion/rootstock combinations and two nitrogen (N) doses (100 and 200 mg kg-1 of soil). Plants were irrigated with water of 3.0 dS m-1. For both experiments, gas exchanges and mean mass of fruits were evaluated at harvest. Gas exchanges were inhibited in plants under saline stress. Plants grafted with Common Rangpur lime showed greater production potential than did the other genotypes studied, even under brackish water conditions.

          Translated abstract

          RESUMO: Em dois experimentos simultâneos, avaliou-se o impacto da irrigação com água salinizadas e da adubação nitrogenada (N) sobre a produção de citros (combinações copa/porta-enxerto) e suas trocas gasosas. Estes experimentos foram realizados no Campus da Universidade Federal de Campina Grande, Brasil, em um ambiente protegido (telas de sombrite nas laterais), utilizando lisímetros de drenagem. No Experimento I utilizou-se um delineamento em blocos casualizados (3 repetições), em esquema fatorial 5 x 3, correspondendo a cinco níveis de salinidade da água (0,6; 1,2; 1,8; 2,4 e 3,0 dS m-1) e três combinações de copa/porta-enxertos: RS1 - Sunki comum mandarim (TSKC) x Poncirus trifoliata Inglês (Treng) - 256; RS2 - Comum limão Cravo (LCR TC); e RS3 - TSKC × (limão Cravo (LCR) × P. trifoliata (TR)) - 059; com Mimo do Céu laranja como a variedade copa. No Experimento II utilizou um delineamento em blocos casualizados (3 repetições), em esquema fatorial 3 x 2, correspondendo a três combinações de copa/porta-enxerto e duas doses de nitrogênio (N) (100 e 200 mg kg-1 de solo). As plantas foram irrigadas com água de 3,0 dS m-1. Em ambos os experimentos, as trocas gasosas e a massa média dos frutos foram avaliados na colheita. As trocas gasosas foram inibidas em plantas sob estresse salino. Plantas enxertadas com limoeiro Cravo Comum apresentaram maior potencial de produção quando comparado aos outros genótipos estudados, mesmo em condições de água salina.

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          Ureases I. Functional, catalytic and kinetic properties: A review

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            Multiple abiotic stresses occurring with salinity stress in citrus

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              Ecofisiologia vegetal

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcaat
                Revista Caatinga
                Rev. Caatinga
                Universidade Federal Rural do Semi-Árido
                1983-2125
                June 2016
                : 29
                : 2
                : 415-424
                Affiliations
                [1 ] Universidade Federal de Campina Grande Brazil
                [2 ] Universidade Federal do Recôncavo da Bahia Brazil
                [3 ] Universidade Federal de Campina Grande Brazil
                Article
                S1983-21252016000200415
                10.1590/1983-21252016v29n218rc
                cdcb510f-51e1-4de7-9991-9a3e6b4f8793

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1983-2125&lng=en
                Categories
                AGRICULTURE, DAIRY & ANIMAL SCIENCE
                AGRONOMY
                FISHERIES
                FOOD SCIENCE & TECHNOLOGY
                FORESTRY
                VETERINARY SCIENCES

                Animal agriculture,Food science & Technology,Aquaculture & Fisheries,General veterinary medicine,Horticulture,Forestry
                Saline stress,Citrus spp.,Physiology,Mimo-do-Céu orange,Fisiologia,Estresse salino,Laranja 'Mimo-do-Céu'

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