Enhancement of short-term nitrogen uptake by greenhouse roses under intermittent N-deprivation

A recirculating nutrient solution system was utilized to study the effect of intermittent N deprivation on N uptake by mature 'Royalty' rose over the course of one flowering cycle. Plants received a nutrient solution lacking N for 4, 8 or 16 days, after which one containing NO₃-N (0.75 mM)...

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Bibliographic Details
Published in:Plant and soil 1996-02, Vol.179 (1), p.73-79
Main Authors: Cabrera, R.I. (California Univ., Davis, CA (USA). Dept. of Environmental Horticulture), Evans, R.Y, Paul, J.L
Format: Article
Language:English
Subjects:
ABSORCION DE SUSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
AZOTE
Crop harvesting
CULTIVO PROTEGIDO
CULTURE SOUS ABRI
FLORACION
FLORAISON
FLOWERING
Flowers
Nitrates
NITROGEN
NITROGENO
NUTRIENT SOLUTIONS
NUTRIENT UPTAKE
Plant growth
Plant roots
Plants
PROTECTED CULTIVATION
ROSA
ROSA (GENERO)
Seedlings
SOLUCIONES NUTRITIVAS
SOLUTION NUTRITIVE
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Summary:A recirculating nutrient solution system was utilized to study the effect of intermittent N deprivation on N uptake by mature 'Royalty' rose over the course of one flowering cycle. Plants received a nutrient solution lacking N for 4, 8 or 16 days, after which one containing NO₃-N (0.75 mM) was supplied for 4 days. N-deprivation resulted in a 2-3 fold increase in N uptake rate compared to control plants supplied continuously with N. The magnitude of this deprivation-enhanced N uptake was not affected by either the duration of N-deprivation or the plant developmental stage. Over the course of the flowering cycle, the total cumulative N uptake by the plants was 95, 66, and 44% of the control plants in the 4, 8 and 16-day deprivation treatments, respectively. A characteristic diurnal pattern of N uptake occurred in both N-starved and control plants. Uptake oscillated between minimum rates in the morning and maximum rates in the evening, the latter occurring 4-6 hr after the maximum rate of transpiration.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF00011644