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Phosphate fertilizer value of heat treated sewage sludge ash

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Figure

Table 1. P-content, neutral ammonium citrate solubility (NAC) and neutralizing value of four different sewage sludge products and triple superphosphate (TSP)
Table 2. Setup of the pot fertilization experiment with different products made of sewage sludge
Figure 1. (a) Dry matter yield responses of maize; (b) P-uptake of maize plants, and (c) concentration of CAL extractable P in the soil after fertilization with four different sewage sludge products (USSA – untreated sewage (g/pot)sludge ash; GP1, GP2 and
Table 3. Phosphorus concentrations of maize biomass (% P in dry mass, means of four replicates) after fertiliza-tion with four different sewage sludge products

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