The Effect of Vermicompost and Earthworms (Eisenia fetida) Application on Phytomass and Macroelement Concentration and Tetanic Ratio in Carrot

This experiment evaluated the effects of various vermicompost amounts (0%, 10%, 20%, 25%, and 50%) of the total weight of the mixture of soil and vermicompost) and red worms (0, 10, and 20 individuals/pot) on carrot phytomass and macroelements concentration when applied to soil. Increasing the quantity of vermicompost (Vc) raised the weight of carrot roots and leaves. When we increased the dose of Vc, differences in phytomass growth were diminished gradually. Fifty percent of Vc in the soil did not have a negative impact on the formation of carrot roots and leaves. Vc increased the water content in roots and decreased it in leaves. Earthworms (EWs) in soil increased the weight of both carrot roots and leaves. The positive impact of EW on roots and leaves was higher when the vermicompost content in the soil was lower. EWs showed positive effects on the potassium concentration in whole carrot phytomass. Both EWs and Vc increased the value of the tetanic ratio in the carrot roots, which lowers their quality. EWs showed positive effects on the potassium concentration in whole carrot phytomass. Relationships found between K × Ca and Mg × S were antagonistic. Positive dependencies were detected between the carrot root yield and N, P, K concentration in both leaves and roots.