Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

摘要: Composts were prepared from the solid fraction of pig slurry (SPS) by mixing with cotton gin waste (CGW) in two different proportions. The aim was to assess fertilizer value composts and evaluate potential pollution risks due heavy metal (Cu Zn) concentrations nitrate leaching following their soil application. For this, a pot trial using Italian ryegrass (Lolium multiflorum Lam.) as test plant run glasshouse. Two composts, A B, SPS:CGW ratios 4:3 3:4 (v:v), respectively (OM 63 57 %, TN 36.1 32.7, TP 15.3 10.8 g kg-1 respectively), applied sandy loam at doses based on N supplied (D1: 360 mg pot-1, equivalent 52 kg ha-1, D2: 720 pot-1). They compared soluble mineral (3.62 pot-1 N:P:K 10:10:10; providing pot-1); unfertilized control also tested. risk nitrate-N after simulated intense rainfall events evaluated. experiment carried out double-layer pots, which allowed collection leachates. Both able increase biomass production available-P respect control; available Cu Zn did not significantly treatment, although deficiency limited growth harvests 2 3. compost higher proportion SPS (A) more efficient for fertilization (relative agronomic efficiency: 38.1-47.6 %; nitrogen use 34.1-41.9 % TN), its greater inorganic-N concentration. To obtain high P K efficiencies application rates are recommended, prevent enrichment. Nitrate very low all treatments (<0.5 applied). Therefore, both can be used organic fertilizers partial substitution fertilizers, without significant risk.