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478 results on '"D'Arienzo, Michele"'

14. Anatomy of the Cervical Spine

Author

D’Arienzo, Michele, Peri, Giovanni, Valentino, Biagio, Conti, Antonella, D’Arienzo, Antonio, Peri, Daniele, and Menchetti, Pier Paolo Maria, editor

Published
2016
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33. First results on microfibers in marine sediments from the Gulf of Naples, Italy

Author

Rossi, Manuela, primary, Capasso, Francescopaolo, additional, Rasulo, Ada Antonella, additional, Pretto, Patrizia, additional, Langella, Alessio, additional, Izzo, Francesco, additional, Donadio, Carlo, additional, Vergara, Alessandro, additional, Albanese, Stefano, additional, Arienzo, Michele, additional, Ferrara, Luciano, additional, Fraterrigo Garofalo, Silvia, additional, Fiore, Melania, additional, Fino, Debora, additional, and Tommasi, Tonia, additional

Published
2022
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44. Phytoplankton biomass and main functional groups of the Sele river mouth (Southern Italian Tyrrhenian coast) in a severe drought period

Author

Mangoni, Olga, Ferrara, Luciano, Arienzo, Michele, and Bolinesi, Francesco

Abstract

The phytoplankton community structure of the terminal stretches of the Sele river, one of the most important rivers of the southern Tyrrhenian coast of Italy, was investigated. Main functional groups and total biomass were determined from samples collected in proximity of drainage channels and under a period of severe drought. The overall sampling area was characterized by a strong vertical stratification driven by intrusion of seawater, with large hypoxic or anoxic areas near the bottom. High concentrations of Chl-a up to 95.73 μg/l were observed in the surface water layer (0.1-1.0 m depth) characterized by oxygen oversaturated waters. Cryptophytes and diatoms were the dominant groups, but high variability of minor groups was observed among stations. Results highlighted critical ecological conditions suggesting the need for further studies to cope with the high variability of such a complex system, particularly the utilization of more appropriate sampling scales., BORNH Bulletin of Regional Natural History, V. 1 N. 2 (2021): BORNH 02/2021

Published
2021
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48. Investigation by electro-ultrafiltration on N and P distribution in rhizosphere and bulk soil of field-grown corn

Author

Arienzo, Michele, Di Meo, Vincenzo, Adamo, Paola, and Violante, Pietro

Subjects
Agricultural industry, Earth sciences
Abstract

The distribution of available levels of N and P in rhizosphere and bulk soils of field-grown corn (Zea mays cv. Forban 300) in response to N, R K fertiliser supply was investigated by electro-ultrafiltration (EUF). This technique allowed 3 operationally defined nutrient fractions to be extracted: soluble and immediately available (EUF-I), available (EUF-II), and retained reserve (EUF-III). For nitrogen, the N[O.sub.3.sup.-] and N[H.sub.4.sup.+] forms were measured in the EUF extracts. The investigation was carried out providing N, N+P, N+K, and N+K+R The results indicated that only at 40 days after sowing (DAS), rhizosphere soil was significantly less alkaline than bulk soil and characterised by higher organic carbon levels that increased with crop age. The slightly more acidic environment of the rhizosphere at 40 DAS seemed to be related to the lower levels of EUF-N-N[H.sub.4.sup.+] fractions of rhizosphere soil (0.1-3.2 mg N[H.sub.4.sup.+]/kg) relative to bulk soil (0.54.9 mg N[H.sub.4.sup.+]/kg), with more significant differences observed for the soluble N[H.sub.4.sup.+] pool, EUF-I, and when N was combined with P (N+P) or K (N+K). The extensive nitrification of N[H.sub.4.sup.+] and the initially greater availability of N[O.sub.3.sup.-] accounted for the larger extraction of N[O.sub.3.sup.-] in the EUF-I-N[O.sub.3.sup.-] fraction at 40 DAS. The levels of labile extracted N[O.sub.3.sup.-] were ~8 times greater than EUF-II and EUF-III fractions, with significantly higher values of 27.4 (rhizosphere soil) and 18.8 mg N[O.sub.3.sup.-] /kg (bulk soil) for the N+P treatment. Due to plant uptake, at 40 DAS the EUF-I-N[O.sub.3.sup.-] fraction of rhizosphere soil was also the only pool significantly (P < 0.05) lower than bulk soil, with differences that for N+P treatment were in excess of 45%. Later, at 60-120 DAS, during maximum corn nutrient demand, the levels of all of the EUF-N-N[O.sub.3] fractions became higher in bulk soil. The pool of labile P, EUF-I-R was higher in the rhizosphere soil and related to pH lowering, which occurred especially at 40 DAS and fell below the adequate level indicated by the ratio EUF-II-P/EUF-I-P. The use of the EUF methodology allowed a rough estimate of the amounts of different available nutrients of the studied soil as well as of their relationships with soil properties. Issues of rhizosphere sampling in situ were considered and discussed. Additional keywords: N nutrition, P nutrition, ammonium, nitrate, bulk soil, rhizosphere, pH, nutrient mobilisation, electro-ultrafiltration, yield., Introduction For plant nutrition, it is the quantity of available elements rather than the quantity of extractable nutrients that is of primary importance (van Raij and van Diest 1979). Assessment [...]

Published
2004

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