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Impact of different nutrient solution composition on stinging nettle growth and mineral content

The aim of this study was to determine the effect of two standard nutrient solutions for leafy vegetables on nettle yield and content of dry matter, nitrogen, phosphorus, potassium, calcium, magnesium and iron during multiple harvests. The experiment was set up in the floating system in the unheated greenhouse according to randomized complete block design with three replications. Sowing of stinging nettle was carried out on March 30 in polystyrene trays filled with inert substrate, which were then placed in the pools with two different nutrient solutions. First nutrient solution was prepared according to Tesi with slightly lower EC-values (2.3 dSm-1) and second according to Osvald (2.5 dSm-1). During the spring and summer growing period, two harvests were achieved, on June 8 and July 6, respectively. Higher value of nitrogen [4.17% N in dry weight (dw)] and iron (89.50% Fe dw) were determined at 1st harvest when nettle was grown in nutrient solution with lower EC-value. In the same nutrient solution in the 2nd harvest higher amounts of phosphorus (0.49% P dw) and potassium (4.45% K dw) were determined, along with maximum yield (1.06 kg m-2). Nutrient solution with higher EC-value resulted in higher amount of dry matter (20.11%) as well as calcium (3.09% Ca dw) and magnesium (0.48% Mg dw). Although both nutrient solutions proved to be adequate for growing nettle in floating system, higher values of most observed properties (dry matter, N, P, K, Fe) were achieved in a solution with lower EC-value.

Urtica dioica, dry matter, nutrient solutions, yield

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