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      Índice SPAD para o diagnóstico do estado de nitrogênio na cultura da abobrinha Translated title: SPAD index for nitrogen status diagnosis of zucchini plants

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          Abstract

          O emprego do índice SPAD para o diagnóstico do estado de nitrogênio das culturas tem sido bastante estudado nos últimos anos. Entretanto, não existem trabalhos conclusivos acerca do seu emprego para a cultura da abobrinha. O objetivo do trabalho foi avaliar o emprego do índice SPAD para o diagnóstico do estado de nitrogênio na cultura da abobrinha (cv. Caserta). O experimento, com cinco doses de N (0, 50, 100, 200 e 400 kg/ha) foi conduzido a campo, no delineamento de blocos casualizados, com quatro repetições. No início do florescimento, determinaram-se o teor de clorofila total, índice SPAD e teor de N na quarta folha completamente expandida, a partir do ápice, das plantas. O teor de clorofila total, o índice SPAD e teor de N total nas folhas aumentaram de forma quadrática com aumento das doses de N. Os níveis críticos foliares estimados de teor de clorofila total, índice SPAD e teor de N responsáveis pela máxima produtividade da cultura da abobrinha foram de 5,12 mg g-1 de matéria fresca, 55,62 unidades SPAD e 3,97 dag/kg de matéria seca, respectivamente. Houve correlação linear e positiva das características avaliadas entre si. Os resultados deste trabalho indicam que o índice SPAD, determinado no final da fase vegetativa, pode ser usado no diagnóstico do estado de nitrogênio da cultura da abobrinha

          Translated abstract

          The employment of SPAD index for N status diagnosis of crops has been largely studied in recent years. However, conclusive studies about its usefulness in zucchini plants were not found in literature. The objective of this study was to evaluate the employment of SPAD index for N status diagnosis of zucchini plants (cv. Caserta). The experiment was carried out in Viçosa, Minas Gerais State, Brazil, in a randomized block design with five rates of mineral N (0, 50, 100, 200 and 400 kg/ha), with four replications. At the early flowering stage, total chlorophyll concentration, SPAD index and total N concentration in the fourth fully expanded leaf from the apex of zucchini plants were evaluated. The total chlorophyll concentration, SPAD index and total N concentration in zucchini leaves increased following a quadratic model as a function of the N rates. The estimated critical levels of total chlorophyll concentration, SPAD index and total N concentration on zucchini leaves responsible for maximum fruit yield were 5.12 mg/g of fresh matter, 55.62 units and 3.97 dag/kg of dry matter, respectively. Significant linear and positive correlation between the evaluated characteristics was observed. The results indicate that the SPAD index can be used for N status diagnosis of zucchini plants

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          Most cited references26

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          Novo manual de olericultura

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            Analisis quimico de suelos

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              Diagnóstico do estado nutricional das plantas

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                hb
                Horticultura Brasileira
                Hortic. Bras.
                Associação Brasileira de Horticultura (Vitoria da Conquista )
                1806-9991
                September 2011
                : 29
                : 3
                : 311-315
                Affiliations
                [1 ] Universidade Federal de Viçosa Brazil
                [2 ] Universidade Federal de Viçosa Brazil
                [3 ] Universidade Federal de Viçosa Brazil
                Article
                S0102-05362011000300009
                10.1590/S0102-05362011000300009
                4bd21ebc-e3c0-453d-b72d-3b3ab905e624

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0102-0536&lng=en
                Categories
                HORTICULTURE

                Horticulture
                Cucurbita pepo,chlorophyll,mineral nutrition,clorofila,nutrição mineral
                Horticulture
                Cucurbita pepo, chlorophyll, mineral nutrition, clorofila, nutrição mineral

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