Fig. 2
From: Mechanism of nutrition activity of a microgranule fertilizer fortified with proteins
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12870-020-02340-4/MediaObjects/12870_2020_2340_Fig2_HTML.png)
Changes in the mean excess concentration of \( \mathrm{N}{\mathrm{H}}_4^{+} \) ions with time in the extracts from the soil layer 1 surrounding the microgranule fortified with the whey protein isolate; the concentration of ions in the blank soil sample (without the presence of the microgranule) was subtracted from the concentration measured in the presence of the microgranule