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Pizzeghello, Diego (2011) Phosphorus cycle in agricultural soils. Phosphorus forms and P-sorption properties after long-term mineral and manure applications. [Ph.D. thesis]

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Abstract (english)

Food production requires the application of phosphorus (P) containing-fertilizers but phosphate is a finite reserve that has been estimated to last about 90 yr. In agricultural lands, where the excessive use of fertilizers occurs, significant diffuse P losses to surface and groundwater have been found. Thus, the high P concentration in waters is a major cause of eutrophication with detrimental impacts on the water quality for both of the ecosystem and human health. The knowledge of the different forms of P in the soil and the reactions that happens between P and the soil components is important to better understand the phosphorus behaviour in soils. The effects of a long-term mineral and organic fertilization in three different alkaline soils was considered and the occurrence of different forms of P were investigated. The high fertilisation strictly increased the P saturation of soils, especially in the superficial layers, thus evidencing the resulting movement of P throughout the soil profiles. The movement of the soluble and available P forms from the upper to lower layers has been confirmed in a study on soil profiles and down to 100 cm depth. Relationship between soil test P (STP) and the water soluble P evidenced the necessity of estimating the losses of P via subsurface when P exceed both agronomic and environmental thresholds. Keeping agronomic STP below the environmental threshold is important in developing sustainable agricultural systems, as well as many other areas where human activity impacts on the environment.

Abstract (italian)

Food production requires the application of phosphorus (P) containing-fertilizers but phosphate is a finite reserve that has been estimated to last about 90 yr. In agricultural lands, where the excessive use of fertilizers occurs, significant diffuse P losses to surface and groundwater have been found. Thus, the high P concentration in waters is a major cause of eutrophication with detrimental impacts on the water quality for both of the ecosystem and human health. The knowledge of the different forms of P in the soil and the reactions that happens between P and the soil components is important to better understand the phosphorus behaviour in soils. The effects of a long-term mineral and organic fertilization in three different alkaline soils was considered and the occurrence of different forms of P were investigated. The high fertilisation strictly increased the P saturation of soils, especially in the superficial layers, thus evidencing the resulting movement of P throughout the soil profiles. The movement of the soluble and available P forms from the upper to lower layers has been confirmed in a study on soil profiles and down to 100 cm depth. Relationship between soil test P (STP) and the water soluble P evidenced the necessity of estimating the losses of P via subsurface when P exceed both agronomic and environmental thresholds. Keeping agronomic STP below the environmental threshold is important in developing sustainable agricultural systems, as well as many other areas where human activity impacts on the environment.

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EPrint type:Ph.D. thesis
Tutor:Morari, Francesco
Supervisor:Nardi, Serenella
Ph.D. course:Ciclo 23 > Scuole per il 23simo ciclo > SCIENZE DELLE PRODUZIONI VEGETALI > AGRONOMIA AMBIENTALE
Data di deposito della tesi:UNSPECIFIED
Anno di Pubblicazione:27 January 2011
Key Words:forme di fosforo, P-saturazione, lisciviazione, suolo calcareo, Mehlich-3-P; phosphorus forms, P-saturation, leaching, calcaric soil, Mehlich-3-P
Settori scientifico-disciplinari MIUR:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Struttura di riferimento:Dipartimenti > pre 2012 - Dipartimento di Agronomia Ambientale e Produzioni Vegetali
Codice ID:3595
Depositato il:01 Aug 2011 10:55
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