Soil Application of Tannery Land Plaster: Effects on Nitrogen Mineralization and Soil Biochemical Properties

Figure 4

Microbial biomass ninhydrin-reactive N (B_NIN), in soil M (a) and soil P (b) and protease activity in soil M (c) and soil P (d) at different sampling time. C: controls; P. 220: TLP addition rate at 220 kg N ha⁻¹; 440: TLP addition rate at 440 kg N ha⁻¹; bars represent standard deviation (𝑛=3).

(a)

(b)

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