Purpose. The aim of our experiment was to determine the changes of fenugreek (Trigonella foenum-graecum) nutrient content and biomass in the two years under study as a result of nutrient supply, plant protection and irrigation. Fenugreek is an annual herbaceous plant belonging to the legumes (Fabaceae) family. It is a multifunctional crop for use in domestic and farm animal feeds, wild fodder, herbs and spices.

Methods. The experiment was carried out in open field on 100 m² plots in Kecskemét. Novatec premium fertilizer (15 N - 3 P₂O₅ - 20 K₂O - 2 MgO) was used in the research. The herbicide Pantera 40 EC (active ingredient content: 40 g / l quizalofop-P-tefuryl) was used for weed control.

Results. In both years, after the crop emerged fenugreek seeds within a week. In 2018, the average height of plants was 30 cm for the start of harvest. On a plot of 100 m², the dry weight mean of mowed fenugreek is 13.15 kg dry weight (300 kg / ha Mg treatment). According to our observations, the height of the fenugreek stock reached 50 cm in 2019. The dry weight mean after harvest is 28.2 kg dry weight (300 kg / ha Mg treatment). The results of the second experimental year are higher than the first year.

Conclusions. The magnesium fertilizer resulted in an increase in the green weight of the fenugreek.