Alfredo Polo

TL;DR: In this article, a long-term field experiment utilising barley received four different treatments prior to sowing: municipal solid waste (MSW) compost at either 20 t ha 21 (C20) or 80 t ha21 (C80); cow manure (MA) at 20 t h 21 ; mineral fertilizer (MIN) or NPK (400 kg ha 21 ); and NH4NO3 (150 kg h 21 ).

TL;DR: In this article, soil samples from 25-year-old experimental plots continuously cropped with barley (Hordeum vulgare L.) under no-tillage (NT) and chisel tillage (CT) were subjected to a new physical fractionation method to isolate dissolved organic matter (OM), mineral-free particulate OM located outside aggregates (physically and chemically unprotected), OM occluded within both macroaggregates and micro aggregates, respectively, and OM in intimate association with minerals (protected by chemical mechanisms).

TL;DR: In this paper, a field experiment was carried out from 1998 to 2001, to investigate the effects of sewage sludge application to barley (Hordeum vulgare L.) var. Sunrise crops on the relationships between plant physiology and some soil properties.

TL;DR: In this article, the most recent results obtained on this topic by the research groups operating in Bari, Italy, and in Madrid, Spain are discussed comparatively with results recently published by other research groups.

TL;DR: In this paper, the effect of consecutive annual additions of pig slurry (PS) at rates of 30, 60, 90, 120 and 150 m 3 ha -1 y -1 over a 4-year period on soil chemical properties and microbial activity was investigated and compared to that of an inorganic fertilization and a control (without amendment).