D.M. van der Sar, P.H.B. de Visser, J. Vos
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.
van der Sar, D.M., de Visser, P.H.B. and Vos, J. (2014). NUTRIENT UPTAKE OF FOUR CUT ROSE VARIETIES. Acta Hortic. 1034, 559-566
DOI: 10.17660/ActaHortic.2014.1034.71
mineral nutrition, glasshouse climate, biomass production, fertigation, rockwool, water recirculation, statistical analysis

Acta Horticulturae