|Title||Nutrient Uptake of Four Cut Rose Varieties|
|Author(s)||Sar, D.M. Van Der; Visser, P.H.B. De; Vos, J.|
|Source||Acta Horticulturae 1034 (2014). - ISSN 0567-7572 - p. 559 - 566.|
WUR GTB Teelt & Gewasfysiologie
Centre for Crop Systems Analysis
|Publication type||Refereed Article in a scientific journal|
|Abstract||Data on climate and nutrient composition of water of commercial cultivation of
four different rose varieties were analysed statistically. The calculated mineral uptake was related to nutrient supply, plant growth and glasshouse climate.
The data were derived from a production period of 3 to 7 years and consisted
of weekly averages of the production (g m-2 wk-1 fresh weight), climate, climate control and fertigation variables. The latter included volumes applied and drained, EC ‘in and out’ (providing estimates of total ion uptake) and concentrations of macro and micro elements ‘in and out’. The roses were grown on rockwool substrate and two glasshouses were equipped with mobile growth systems. The installed assimilation light ranged from 65-165 μmol m-2 s-1 between systems.
Regression models were calculated by means of forward stepwise regression,
the models describe the total ion uptake and the uptake of the individual elements. The total ion uptake of the crop varied and depended on glasshouse climate, climate regulation of the glasshouse, drain water percentage and drain water pH, season, and production. The uptake of the individual nutrient element was explained for 33% to 99% by the ensemble of nutrient concentrations in the fertigation solution, depending on the element and cultivar. Across the four cultures, the 3-7 year average uptake concentration of the elements showed little variation. Within each culture the uptake of the individual elements varied most of the time parallel with each other and with the production.
The regression model gives insights in the supply and demand of nutrients by
roses, ultimately leading to a high production and good quality combined with a more sustainable fertilizer management.