Abstract
Samples of water were extracted from within substrates of three commercial watercress beds using specially constructed ‘substrate stylets’. These waters were subsequently analysed for their mineral nutrient content. Levels of N, P, K, Ca, Mg, Fe, Mn and Zn in substrate waters were compared with the concentrations found in surface waters and plant shoot and root tissues from each site. Root systems of watercress penetrate bed substrates and may utilize mineral nutrients within this environment. The main difference in nutrient status between surface and substrate waters is shown by phosphate and manganese, which are present in greater concentrations in substrate solutions, and nitrate which is much higher in surface waters.
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