RESPONSE OF GROWTH OF TOMATO TO PHOSPHORUS AND NITROGEN NUTRITION
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.
de Groot, C.C., Marcelis, L.F.M., van den Boogaard, R. and Lambers, H. (2004). RESPONSE OF GROWTH OF TOMATO TO PHOSPHORUS AND NITROGEN NUTRITION. Acta Hortic. 633, 357-364
DOI: 10.17660/ActaHortic.2004.633.43
https://doi.org/10.17660/ActaHortic.2004.633.43
DOI: 10.17660/ActaHortic.2004.633.43
https://doi.org/10.17660/ActaHortic.2004.633.43
nutrient limitation, relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR), cytokinin, dry-mass partitioning
English
633_43
357-364
- Working Group Modelling Plant Growth, Environmental Control, Greenhouse Environment
- Working Group Greenhouse Environment and Climate Control
- Working Group Hydroponics and Aquaponics
- Commission Agroecology and Organic Farming Systems
- Division Protected Cultivation and Soilless Culture
- Division Precision Horticulture and Engineering
- Division Physiology and Plant-Environment Interactions of Horticultural Crops in Field Systems