19
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants Translated title: Concentração de nitrogênio na matéria seca da quinta folha no decorrer do crescimento de plantas de tomateiro em estufa

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The nitrogen concentration in dry matter of the fifth leaf during growth of a greenhouse tomato crop was determined. Plants of hybrid Monte Carlo were grown in 4.5 L bags, using a commercial substrate, in a plant density of 3.3 plants m-2. A nutrient solution containing, in mmol L-1: KNO3, 4.0; K2SO4, 0.9; Ca(NO3)2, 3.75; KH2PO4, 1.5; MgSO4, 1.0; iron chelate 19. 10³, was used as reference. Microelements were added by a commercial mixture. The T3 treatment was equal to the reference nutrient solution, whereas in treatments T1, T2, T4 and T5 quantities of all nutrients from T3 were multiplied by 0.25, 0.50, 1.25 and 1.50, respectively. In each treatment, the volume of 1 L of nutrient solution was supplied to each plant once a week by fertigation. Periodically destructive measurements were made from anthesis to ripening of the first truss, to determine dry matter and N concentration in shoot and in fifth leaf tissues, counted from the apex to the bottom of the plant. Five dilution curves were fitted from data of N concentration in the fifth leaf and shoot dry matter accumulation during growth of plants. A general relationship was adjusted between actual N concentration in shoot (Nt) and in the fifth leaf (Nf): Nt = 1.287 Nf (R² = 0.80). This relationship could be used to estimate the N status of plants by means of a nitrogen nutrition index (NNI), from analysis of the fifth leaf sap.

          Translated abstract

          Determinou-se a concentração de nitrogênio na massa seca da quinta folha definitiva no decorrer do crescimento de uma cultura de tomateiro. Plantas do híbrido Monte Carlo foram cultivadas em sacolas plásticas contendo 4,5 L de um substrato comercial, na densidade de 3,3 plantas m-2. Foi empregada como referência uma solução nutritiva contendo, em mmol L-1: KNO3, 4,0; K2SO4, 0,9; Ca(NO3)2, 3,75; KH2PO4, 1,5; MgSO4, 1,0; quelato de ferro 19. 10³. Os demais micronutrientes foram fornecidos através de uma solução completa. O tratamento T3 foi igual à dose de referência e os demais tratamentos foram fixados em doses múltiplas de T3, multiplicando-se as quantidades de todos os nutrientes por 0,25; 0,50; 1,25 e 1,50, para os tratamentos T1, T2, T4 e T5, respectivamente. Em cada tratamento, o volume de 1 L de solução foi aplicado para cada planta em intervalos semanais, por fertirrigação. Medidas periódicas foram feitas no período entre a antese e a maturação dos frutos da primeira inflorescência, para determinar a acumulação de massa de matéria seca e de N na parte aérea e na quinta folha, contada do ápice para a base da planta. Cinco curvas de diluição foram ajustadas com dados de concentração de N na quinta folha e de acumulação da massa seca no decorrer do crescimento das plantas. Uma relação foi ajustada entre a concentração de N na parte aérea da planta (Nt) e na quinta folha (Nf): Nt = 1.287 Nf (R² = 0.80). Essa relação poderá ser empregada para avaliar o estado nutricional das plantas, empregando-se o índice de nutrição de nitrogênio (NNI), a partir de dados de análise dos tecidos da quinta folha.

          Related collections

          Most cited references22

          • Record: found
          • Abstract: not found
          • Article: not found

          Decline in Percentage N of C3 and C4 Crops with Increasing Plant Mass

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Physiological Bases for Assessing the Nutritional Requirements of Plants

            A. Ulrich (1952)
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Growth Rate and % N of Field Grown Crops: Theory and Experiments

                Bookmark

                Author and article information

                Journal
                hb
                Horticultura Brasileira
                Hortic. Bras.
                Associação Brasileira de Horticultura (Vitoria da Conquista, BA, Brazil )
                0102-0536
                1806-9991
                December 2002
                : 20
                : 4
                : 626-629
                Affiliations
                [01] Balcarce Buenos Aires orgnameUniversidad Nacional de Mar del Plata Argentina
                [02] Santa Maria RS orgnameUFSM
                Article
                S0102-05362002000400023 S0102-0536(02)02000423
                10.1590/S0102-05362002000400023
                7cc2bd5d-080f-47cb-a504-850c9a8da566

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

                History
                : 22 August 2001
                : 11 June 2002
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 4
                Product

                SciELO Brazil

                Categories
                Research

                nutrients,nutrientes,Lycopersicon esculentum,nutrição mineral,adubação,mineral nutrition,fertilization

                Comments

                Comment on this article