ISHS Acta Horticulturae 761: XXVII International Horticultural Congress - IHC2006: International Symposium on Advances in Environmental Control, Automation and Cultivation Systems for Sustainable, High-Quality Crop Production under Protected Cultivation
CROP SPECIFIC APPLICATION RATES OF NITROGEN FOR SOIL-GROWN CROPS IN GREENHOUSES TO PROTECT THE GROUNDWATER |
| Authors: | A.A. Pronk, W. Voogt, L.F.M. Marcelis |
| Keywords: | Chrysanthemum, Dendranthema, fertilizer application, balance, irrigation |
| Abstract:
In a desk study, nitrogen (N) fertilizer application rates were studied and N-concentrations at one meter depth or at the drain were estimated for Chrysanthemum grown in twelve greenhouse cropping systems, differing in soil type, supplemental lighting and transmissivity. Two N-saving strategies were also studied of which one estimated the N-concentration in the irrigation water to comply with the EU target value of 11.3 mg N L-1. N-surplus varied between 6 and over 709 kg ha-1 yr-1. The N-saving strategies reduced the N-surplus but none of the estimated N-concentrations were below the target value. Growers affect both the N-surplus and the irrigation surplus. Predefined concentrations are therefore not met if only N-fertilizers are regulated through crop specific application rates. Guidelines on irrigation applications need to be provided as well. | |
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