Phosphorous extractability and ryegrass availability from bio-waste composts in a calcareous soil.

In this work four stable bio-waste composts (C1, C2, C3, C4) were selected on the basis of their increasing water soluble P (HO-P). The P speciation was assessed via sequential chemical extraction (SCE) on the same products. Moreover, the plant-available P was assessed via apparent recovery fraction approach (ARF) in a pot test on ryegrass over 21 weeks at 15 mg P kg of soil.

Air-filled porosity and permeability relationships during solid-state fermentation.

An experimental apparatus was constructed to measure the structural parameters of organic porous media, i.,e. mechanical strength, air-filled porosity, air permeability, and the Ergun particle size.

Control of the sulfide (S2-) concentration for optimal zinc removal by sulfide precipitation in a continuously stirred tank reactor.

Precipitation of Zn2+ with S2- was studied at room temperature in a continuously stirred tank reactor of 0.5l to which solutions of ZnSO4 (800-5800 mgl(-1) Zn2+) and Na2S were supplied. The pH was controlled at 6.