Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/4484
Título: Growth and nutrition of carob plants as affected by nitrogen sources
Autor: Cruz, Cristina
Lips, S. Herman
Martins-Loução, Maria Amélia
Palavras-chave: Biologia vegetal
Fontes de nitrogénio
Data: 1993
Editora: Taylor & Francis
Citação: Journal of Plant Nutrition, 16(1), 1-15 (1993)
Resumo: Carob seedlings were grown at different proportions of nitrate NO3) and ammonium (NH4) supplied at a concentration of 3.5 mM nitrogen (N). The effect of five different combinations of NH4- and NO3-N on growth rates, N and carbon (C) content of the plant and dry matter distribution were studied. The presence of NH4 in the nutrient solution enhanced plant growth rate, although net photosynthesis rates per unit area were lower than in NO3-fed plants. Nitrate –fed plants exbibited the highest rates of carbon dioxide (CO2) assimilation, water use, and N-use efficiency. Nevertheless, plants growing only with NO3 were more fragile and susceptible to fungus infections. The role of cotyledons on the regulation of the supply of photosynthates from leaves to roots in the different combinations of NO3- and NH4-N is described. Results suggest that the growth rates of carob may be improved using suitable combinations of NO3- and NH4-N. Equal concentrations of these two N sources allows good development and adequate allocation of low C and N to different developing sinks of the carob seedlings.
Peer review: yes
URI: http://hdl.handle.net/10451/4484
ISSN: 0190-4167
Aparece nas colecções:FC - Artigos em Revistas Internacionais

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