The influence of nitrogen concentration and salinity of recirculating solutions on the early-season vigour and productivity of glasshouse tomatoes

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Abstract
The growth and productivity of a three-truss crop of glasshouse tomatoes were compared in nutrient solutions containing three N levels (30, 60 and 120 ppm) at each of three salinities (1000, 2 000 and 4 000 mS cm-1). Raising the N level markedly increased vegetative vigour (measured as stem diameter) and total yield. Fruit quality and the time to first pick were not influenced by the N concentrations and salinities used. The number of fruits per plant and fruit size were increased by raising the concentration of N but not by salinity. The inclusion of 13.3% of the total N in ammonium form to the soft water supply successfully controlled solution pH and was not detrimental either to growth or fruit quality.

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