Saturday, 15 July 2006

Variation in Some Properties of a Soil Conditioned by Oil Waste.

Giovanna Cucci, Università di Bari- Dipartimento di Scienze delle Produzioni Vegetali, Via Amendola, 165/a, Bari, 70126, Italy, Giovanni Lacolla, Università di Bari-Dipartimento di Scienze delle Produzioni Vegetali, Via Amendola 165/a, Bari, 70126, Italy, and Leonardo Caranfa, Liceo Scient. Polivalente, Via Madonna del Soccorso, Cisternino, Italy.

In Italy where the soil organic matter content is low and the Mediterranean climate contributes to its fast mineralization, the spreading of wet pomace (SU) on the agricultural soil could increase fertility, allowing crops to benefit from the nutrients contained, inducing neither toxicity nor yield reductions. The objective of this research was to assess the effects of the ploughing of increasing amounts of non-fermented wet pomace on the fertility of a silty-clay soil, grown with 3 crops in succession (sunflower–wheat-wheat). The research was conducted at the Campus of the Agricultural Faculty of Bari (Italy) on a Pachic Hoploxeroll soil, series Cutino (Locorotondo - Bari) characterized by illite and kaolinite and large amounts of Fe and Al sesquioxides. A randomized block design was used with 6 replicates to compare 8 doses of non-fermented WP containing 65% moisture (0 – 17.5 – 35.0 - 70.0 – 105.0 - 140.0- 175.0 – 210.0 Mg ha-1), incorporated 60 days prior to sunflower sowing. All other local cultural practices were also applied. In the wheat late season of the second year, along the 0-0.60 cm soil profile some samples were taken and tested for the structure stability, organic matter, total nitrogen, available phosphorus, exchangeable potassium, pH and saturation extract electrical conductivity. The results obtained show that in terms of fertilizing value, the WP shows a positive effect on P and K, but a high and constant ability to immobilize the mineral N in the soil. The WP, which has a definitely acid reaction (pH 5.5), seems to moderately lower the soil pH, notably in the higher dose; the saturated paste electrical conductivity increases with increasing doses. Key words: wet pomace, soil structure stability, organic matter.

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