TY - GEN
T1 - Response of growth of tomato to phosphorus and nitrogen nutrition
AU - De Groot, C. C.
AU - Marcelis, L. F.M.
AU - Van Den Boogaard, R.
AU - Lambers, H.
PY - 2004/3/11
Y1 - 2004/3/11
N2 - A detailed growth analysis has been conducted to unravel the separate effects of nitrogen and phosphorus nutrition on growth of young tomato plants (Lycopersicon esculentum Mill. cv. Capita) and to study their interaction. We show that relative growth rate increased sharply with increasing plant P concentration before it levelled off, resulting in a broad plateau, while the response of relative growth rate (RGR, mg g-1 day-1) to increasing plant N concentration was gradual and levelled off at high N concentrations, resulting in a small plateau. Possible causes of this different shaped response are discussed. Furthermore, we show that the importance of net assimilation rate (NAR, g m-2 day-1) and leaf area ratio (LAR, m2 kg-1) in explaining the effects of N and P on growth may depend on the severity of the nutrient limitation. Finally we discuss the hypothesis that the regulation of the measured increase in dry-mass partitioning to the roots with decreasing N and P supply and the measured decrease in plant N concentration with decreasing P supply may be mediated by cytokinins. This paper summarises and discusses some of the data described in earlier papers (De Groot et al., 2001; 2002; 2003) on the regulation of growth by P and N nutrition.
AB - A detailed growth analysis has been conducted to unravel the separate effects of nitrogen and phosphorus nutrition on growth of young tomato plants (Lycopersicon esculentum Mill. cv. Capita) and to study their interaction. We show that relative growth rate increased sharply with increasing plant P concentration before it levelled off, resulting in a broad plateau, while the response of relative growth rate (RGR, mg g-1 day-1) to increasing plant N concentration was gradual and levelled off at high N concentrations, resulting in a small plateau. Possible causes of this different shaped response are discussed. Furthermore, we show that the importance of net assimilation rate (NAR, g m-2 day-1) and leaf area ratio (LAR, m2 kg-1) in explaining the effects of N and P on growth may depend on the severity of the nutrient limitation. Finally we discuss the hypothesis that the regulation of the measured increase in dry-mass partitioning to the roots with decreasing N and P supply and the measured decrease in plant N concentration with decreasing P supply may be mediated by cytokinins. This paper summarises and discusses some of the data described in earlier papers (De Groot et al., 2001; 2002; 2003) on the regulation of growth by P and N nutrition.
KW - Cytokinin
KW - Dry-mass partitioning
KW - Leaf area ratio (LAR)
KW - Net assimilation rate (NAR)
KW - Nutrient limitation
KW - Relative growth rate (RGR)
UR - http://www.scopus.com/inward/record.url?scp=70449428044&partnerID=8YFLogxK
U2 - 10.17660/ActaHortic.2004.633.43
DO - 10.17660/ActaHortic.2004.633.43
M3 - Conference paper
AN - SCOPUS:70449428044
SN - 9789066056275
T3 - Acta Horticulturae
SP - 357
EP - 364
BT - XXVI International Horticultural Congress
PB - International Society for Horticultural Science
ER -