N sources affect growth, nutrient content, and net photosynthesis in maté (Ilex paraguariensis St. Hil.)
The influence of different N sources on the growth of maté (Ilex paragurariensis St.Hil.) seedlings grown in greenhouse was studied. All seedlings received a base fertilization of 10 mg N.kg-1 soil as NH4NO3, 60 mg P2O5.and 40 mg K2O.kg-1 soil as KH2PO4 15 days before treatments application. Treatme...
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Published in | Brazilian archives of biology and technology Vol. 49; no. 5; pp. 689 - 697 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Tecpar
01.09.2006
Instituto de Tecnologia do Paraná (Tecpar) |
Subjects | |
Online Access | Get full text |
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Summary: | The influence of different N sources on the growth of maté (Ilex paragurariensis St.Hil.) seedlings grown in greenhouse was studied. All seedlings received a base fertilization of 10 mg N.kg-1 soil as NH4NO3, 60 mg P2O5.and 40 mg K2O.kg-1 soil as KH2PO4 15 days before treatments application. Treatments were as follow: Control, with no extra N added; Urea = 100 mg N.kg-1 soil as Urea; NO3- = 100 mg N.kg-1 soil as Ca(NO3)2; and NH4+ = 100 mg N.kg-1 soil as (NH4)2SO4. It was concluded that: 1) increasing N content in leaves alone was not able to promote gain in biomass production of maté seedlings; 2) seedlings receiving N-NH4 showed a higher accumulation of P and Mg on shoot biomass; and 3) an increase in leaf area, leaf number and net photosynthesis observed at the N-NH4 treatment was coincident with an increasing absorption of P and Mg.
A influência de diferentes fontes de N sobre o crescimento de mudas de erva-mate (Ilex paraguariensis St.Hil.) foi estudada, em casa de vegetação. Todas as mudas receberam uma fertilização base de 10 mg N.kg-1 de solo na forma de NH4NO3, 60 mg P2O5.kg-1 e 40 mg K2O.kg-1 de solo na forma de KH2PO4 quinze dias antes da aplicação dos tratamentos. Os tratamentos foram os seguintes: Controle, sem adição extra de N; Uréia = 100 mg N.kg-1 de solo como Uréia; NO3- = 100 mg N.kg-1 de solo como Ca(NO3)2; e NH4+ = 100 mg N.kg-1 de solo como (NH4)2SO4. Concluiu-se que: 1) o aumento do conteúdo de N nas folhas, por si, não é capaz de promover ganhos na produção de biomassa em mudas de erva-mate; 2) mudas que receberam N-NH4 apresentaram maior acumulo de P e Mg na biomassa aérea; e 3) o aumento na absorção de P e Mg coincidiu com um aumento na área foliar, no número de folhas e na fotossíntese liquida na fonte N-NH4. |
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Bibliography: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600001 10.1590/S1516-89132006000600001 |
ISSN: | 1516-8913 1516-8913 1678-4324 |
DOI: | 10.1590/S1516-89132006000600001 |