Fig. 4
From: Mechanism of nutrition activity of a microgranule fertilizer fortified with proteins
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12870-020-02340-4/MediaObjects/12870_2020_2340_Fig4_HTML.png)
Mean concentration of ions in the extracts from the soil layer 1 acquired after 168 h; blank sample without the contact with the microgranule, sample after the contact with the microgranule free of the protein, and with the microgranule fortified with the whey protein isolate