Vol. 83 No: 6

Title:
Sulphur fertilisation affects yield and quality in friarielli (Brassica rapa L. subsp. sylvestris L. Janch. var. esculenta Hort.) grown in a floating system

Authors:
S. DE PASCALE, A. MAGGIO, F. ORSINI, A. BOTTINO and G. BARBIERI

pp: 743-748

Abstract:
The influence of nitrogen and sulphur fertilisation on yield and quality was studied in two ecotypes of friarielli (Brassica rapa L. subsp. sylvestris L. Janch. var. esculenta Hort.) grown in a floating system. In the first experiment, we assessed the effects of different levels of N fertilisation on friarielli yield. In a second experiment, we tested three concentrations of S in the nutrient solution [2.6 mM, 4.0 mM, and 8.5 mM; corresponding to N:S concentration ratios of 10:1, 6.5:1, and 3:1, respectively] with the objective of fine-tuning the nutritional requirements for N and S to optimise both friarielli yield and quality. The main findings can be summarised as follows: (i) friarielli can be grown efficiently in a hydroponic system; (ii) both yield and quality in friarielli are strongly dependent on the N:S ratio of the nutrient solution; (iii) S may affect shoot nitrate accumulation in response to N availability; (iv) the response to S fertilisation is genotype-specific; (v) the anti-oxidant capacity of shoots increases with increasing S concentrations in the nutrient solution; and (vi) 26 mM N and an N:S concentration ratio of 10:1 in the nutrient solution are suggested for the best performance of hydroponically-grown friarielli.

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