Effect of Potassium Humate on Growth Processes and Biomass Accumulation of Microgreens under Hydroponic Conditions

Abstract

Background and Purpose. One of the promising approaches to addressing the growing demand of the urban population for fresh vegetables, ensuring a balanced diet in terms of nutrient content, and achieving food security is the development of vertical farming systems for growing microgreens in urban environments.

Objective. To study the effect of potassium humate on the growth and development of microgreens under hydroponic conditions.

Materials and Methods. The objects of the study were microgreens of Swiss chard (Beta vulgaris subsp. cicla L.)and tarragon (Artemisia dracunculus L.), grown in a vertical hydroponic system. At the initial stage (during the first three days), the plants were kept in complete darkness with periodic spraying; afterward, lighting and irrigation were activated. Growth stimulation was carried out by feeding the plants with potassium humate solution at various concentrations (1–3%). Germination rate, biometric parameters, fresh weight, accumulation of biologically active substances, and the visual condition of the microgreens were evaluated.

Results. The most favorable effect on the growth, development, and marketable appearance of microgreens was observed with irrigation using potassium humate at a concentration of 3%.

Conclusion. The use of potassium humate had a positive effect on the morphophysiological characteristics of microgreens and can be recommended for use in intensive hydroponic cultivation technologies.