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Growth of Crotalaria juncea L. supplied with mineral nitrogen

By Elenira Henrique Miranda Mendonça and Marlene Aparecida Schiavinato

Abstract

Plants of Crotalaria juncea inoculated with Rhizobium were treated with nutrient solution containing 10 or 20mg of either N/NO3 or N/NH4.plant-1.week-1 . The control plants received nutrient solution without N. An investigation was conducted on the effect of these sources of N on growth and nitrogen fixation of plants with 30, 60 and 90 days after sowing (DAS). Those that received mineral N presented higher growth than -N plants, but the presence of nodules occurred in all the treatments. Plants treated with NH4 presented higher N content until 60 days. The highest concentrations of leghemoglobin and protein in nodules were found at 30 DAS and there was no difference in leghemoglobin content between treatments for any age and in protein from 60 DAS. Nitrogenase activity did not vary from 60 to 90 days, with the exception of plants that received 20mg N/NO3, where it was higher at 60 days<br>Plantas de Crotalaria juncea inoculadas com Rhizobium foram tratadas com solução nutritiva contendo 10 ou 20mg de N/NO3 ou N/NH4.planta-1 .semana-1. As plantas controle receberam solução nutritiva sem N. Foi verificado o efeito destas fontes de N no crescimento e fixação de nitrogênio em plantas com 30, 60 e 90 dias após a semeadura (DAS). Aquelas que receberam N mineral apresentaram maior crescimento que plantas -N, mas a presença de nódulos ocorreu em todos os tratamentos. Plantas tratadas com NH4 apresentaram maior conteúdo de N até os 60 dias. As maiores concentrações de leghemoglobina e proteínas em nódulos foram verificadas aos 30 DAS e não houve diferença no conteúdo de leghemoglobina entre os tratamentos, em nenhuma das idades e em proteínas a partir de 60 DAS. A atividade da nitrogenase não variou dos 60 aos 90 dias, com exceção de plantas que receberam 20mg N/NO3, nas quais esta foi maior aos 60 dias

Topics: Ammonium, nitrate, rhizobium, nitrogen fixation, Biotechnology, TP248.13-248.65, Chemical technology, TP1-1185, Technology, T, DOAJ:Biotechnology, DOAJ:Life Sciences, DOAJ:Biology and Life Sciences
Publisher: Instituto de Tecnologia do Paraná (Tecpar)
Year: 2005
DOI identifier: 10.1590/S1516-89132005000200003
OAI identifier: oai:doaj.org/article:02c2c1c3fe8742e2b996bb876aec064c
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