1999
DOI: 10.1080/01904169909365672
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Effect of restricted supply of nitrate on fruit growth and nutrient concentrations in the petiole sap of tomato cultured hydroponically

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Cited by 13 publications
(6 citation statements)
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“…In line with the above findings, Marcelis31 observed that shading glasshouse‐grown cucumber plants for an extended period reduced the yield by 60% in comparison with plants grown at 100% irradiance level. Moreover, He et al 32 reported a reduction in hydroponically grown tomato yield by 49% in the autumn–winter season compared with the spring–summer season. Finally, in a study on tomatoes in England,33 both light shade (6.4%) and heavy shade (23.4%) reduced fruit total fresh weight yield by 7.5 and 19.9% respectively compared with unshaded crops.…”
Section: Discussionmentioning
confidence: 99%
“…In line with the above findings, Marcelis31 observed that shading glasshouse‐grown cucumber plants for an extended period reduced the yield by 60% in comparison with plants grown at 100% irradiance level. Moreover, He et al 32 reported a reduction in hydroponically grown tomato yield by 49% in the autumn–winter season compared with the spring–summer season. Finally, in a study on tomatoes in England,33 both light shade (6.4%) and heavy shade (23.4%) reduced fruit total fresh weight yield by 7.5 and 19.9% respectively compared with unshaded crops.…”
Section: Discussionmentioning
confidence: 99%
“…Ikeda (1995) sugeriu que as concentrações de N-NO 3 -na seiva do pecíolo das folhas imediatamente abaixo dos cachos parecem apropriadas entre 700 e 2.200 mg l -1 durante o estádio de desenvolvimento dos frutos dos mesmos e 1.200 a 2.700 mg l -1 durante a colheita. Já He et al (1999) afirmam que o valor dessa variável nas folhas imediatamente abaixo dos cachos superiores deve ser mantido acima de 500 mg l -1 durante o amadurecimento dos respectivos frutos. Segundo esses autores, a taxa de frutificação e o peso médio dos frutos foram significativamente diminuídos durante as estações de primavera a verão quando a concentração de N-NO 3 -na seiva do pecíolo da folha imediatamente abaixo do terceiro cacho caiu abaixo de 500 mg l -1 e decresceu continuamente com o amadurecimento dos frutos deste.…”
Section: Resultado E Discussãounclassified
“…Segundo esses autores, a taxa de frutificação e o peso médio dos frutos foram significativamente diminuídos durante as estações de primavera a verão quando a concentração de N-NO 3 -na seiva do pecíolo da folha imediatamente abaixo do terceiro cacho caiu abaixo de 500 mg l -1 e decresceu continuamente com o amadurecimento dos frutos deste. Desta forma, suficiente quantidade de N disponível deve estar presente na solução do solo ou do sistema hidropônico a fim de satisfazer os requerimentos nutricionais do tomateiro para o seu crescimento e desenvolvimento (HE et al, 1999 o, *, ** e *** Significativos a 10, 5, 1 e 0,1% de probabilidade, respectivamente, pelo teste t.…”
Section: Resultado E Discussãounclassified
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“…Nitrogen promotes leaf area and leaf area index (McCullough et al, 1994;Escalante, 1999), intensifies the green color of the leaves, and is a constituent of essential cellular components such as amino acids, proteins and nucleic acids; also regulates the absorption of phosphorus (P), potassium (K + ) and other nutrients, improving the degree of succulence of many crops and favors photosynthesis due to the increase in chlorophyll concentration (Aroiee and Omidbaigi, 2004;Taiz and Zeiger, 2006;Sedano et al, 2011). Both deficit and excess of N have a negative impact on plants, causing a decrease in production (He et al, 1999;Gonzalez et al, 2005), increasing the susceptibility to pest insects (Jauset et al, 2000;González et al, 2005) and to pathogens (Duffy and Défago 1999;González-Raya et al, 2005), thus the incidence of disease (Marschner, 2012). (Duffy y Défago, 1999;González-Raya et al, 2005), así como la incidencia de enfermedades (Marschner, 2012).…”
Section: Introductionmentioning
confidence: 99%