Effect of applying paper mill sludge to arable land on soil fertility and crop yields
1998
Aitken, M.N. | Evans, B. | Lewis, J.G.
Two field trials were established in 1991 to determine the effects on crop yield, N uptake, soil moisture content and heavy metal concentration of applying de-inked paper mill sludge (DPMS) over the period 1991 to 1993. In the first year, during decomposition of the DPMS, N immobilization occurred resulting in loss of cereal yield (P < 0.05) at low rates of N fertilizer. Approximately 40 kg extra N fertilizer/ha was required per 100t DPMS/ha to compensate for this N immobilization. Soil volumetric moisture content was increased (P < 0.001) by c. 20% at both sites by 200 and 300t DPMS/ha. DPMS did not significantly increase (P > 0.05) soil concentrations of total Zn, Cu and Pb. Soil nitrate concentrations after harvest were reduced (P < 0.01) by c. 17 mg N/kg per 100t DPMS/ha with increasing rates of DPMS up to 200t/ha. In the second year following the DPMS application, there were no significant effects on grain yield indicating that very little or no N was immobilized. By the third year, the soil N supply was 7 kg N/ha higher where a single dressing of 100t DPMS/ha had been applied compared to the control. This resulted in an overall yield increase of 7% (P < 0.10). Soil N supply was lower (N.S.) but crop yields were similar (P > 0.05) to the control where single dressings of 200 and 300t DPMS/ha had been applied.
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