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Figure 4 | Chemical and Biological Technologies in Agriculture

Figure 4

From: Humic substances stimulate maize nitrogen assimilation and amino acid metabolism at physiological and molecular level

Figure 4

NR (a) and NiR (b) specific activities. Seedlings were grown for 14 days in a Hoagland modified complete nutrient solution (0) and treated for the last 2 days with HS concentrations of 0, 1 and 5 mg C L−1. The specific activities were expressed in unit per milligramme protein. One unit corresponds to the production (NR) or consumption (NiR) of 1 μmol of NO2 per minute at the assay conditions. Values are the means of three independent determinations (±SE). Letters above bars indicates significant differences (P < 0.05).

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