TY - JOUR
T1 - Growth and nutrition of carob plants as affected by nitrogen sources
AU - Lips, S. Herman
AU - Cruz, Cristina
AU - Martins-Loucao, Maria Amelia
N1 - Funding Information:
ACKNOWLEDGEMENTS This work has been supported by AID/CDR USA/Israel Cooperative Development Research Program, Project C8-134 and also by JNICT (Junta Nacional de Investigacao Científica e Tecnológica). Project No. 830 86142.
PY - 1993/1/1
Y1 - 1993/1/1
N2 - 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 NH4in the nutrient solution enhanced plant growth rate, although net photosynthesis rates per unit area were lower than in NO3-fed plants. Nitrate-fed plants exhibited the highest rates of carbon dioxide (CO2) assimilation, water use, and N-use efficiency. Nevertheless, plants growing only with NO3were 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 NO3and NH4 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.
AB - 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 NH4in the nutrient solution enhanced plant growth rate, although net photosynthesis rates per unit area were lower than in NO3-fed plants. Nitrate-fed plants exhibited the highest rates of carbon dioxide (CO2) assimilation, water use, and N-use efficiency. Nevertheless, plants growing only with NO3were 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 NO3and NH4 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.
UR - http://www.scopus.com/inward/record.url?scp=84946270073&partnerID=8YFLogxK
U2 - 10.1080/01904169309364511
DO - 10.1080/01904169309364511
M3 - Article
AN - SCOPUS:84946270073
SN - 0190-4167
VL - 16
SP - 1
EP - 15
JO - Journal of Plant Nutrition
JF - Journal of Plant Nutrition
IS - 1
ER -