Mineralization and Crop Uptake of Nitrogen from Textile Manufacturing Wastewater Sludge Cake

Figure 1

Incubation experiment one. Changes with time for ammonium extracted from incubations of sludge and alfalfa with soil at rates of (a) 100, (b) 200, (c) 400, and (d) 800 mg N kg⁻¹ dry soil. Controls received no amendment.

(a)

(b)

(c)

(d)