OAR@UM Collection:https://www.um.edu.mt/library/oar/handle/123456789/374642024-03-28T10:14:02Z2024-03-28T10:14:02ZOn the biology of some rice-field weeds in Sardinia : Cotula and HeterantheraMarchioni Ortu, A.De Martis, B.https://www.um.edu.mt/library/oar/handle/123456789/376212018-12-21T02:46:09Z1989-01-01T00:00:00ZTitle: On the biology of some rice-field weeds in Sardinia : Cotula and Heteranthera
Authors: Marchioni Ortu, A.; De Martis, B.
Abstract: The biology and ecology of Cotula coronopifolia L. (Compositae), Heteranthera
rotundifolia (Kunth) Griseb. and Heteranthera reniformis Ruiz & Pavon (Ponte-
deriaceae), three new weeds naturalized in rice-fields of central-southern Sardinia, are
described. Attention is focussed on the degree of propagation of these "taxa", as a
consequence of their suitability for the environmental conditions of Sardinian rice-
fields, where it seems that marked convergences exist with regard to the original habitat
of these species.1989-01-01T00:00:00ZAirborne pollens analysis in Cagliari (south Sardinia) : observations on Ailanthus altissima (Miller) Swingle,Casuarina equisetifolia J .R. & G. Foster and Schinus molle L.Ballero, Maurohttps://www.um.edu.mt/library/oar/handle/123456789/375852018-12-20T02:44:07Z1989-01-01T00:00:00ZTitle: Airborne pollens analysis in Cagliari (south Sardinia) : observations on Ailanthus altissima (Miller) Swingle,Casuarina equisetifolia J .R. & G. Foster and Schinus molle L.
Authors: Ballero, Mauro
Abstract: In this paper the phenological and airborne pollens dispersal data of Casuarina
equisetijolia J .R. & G. Foster, Ailanthus altissima (Miller) Swingle and Schinusmolle
L., three exotic species widely used for street planting, are examined. The findings have
enabled a detailed identification of the phenological stages and to determine the
amount of airborne pollens of each species, resulting in a better understanding of their
biorhythms and of their pathogenic role.1989-01-01T00:00:00ZCENTRO : volume 1 : issue 4https://www.um.edu.mt/library/oar/handle/123456789/375802018-12-20T02:44:40Z1989-01-01T00:00:00ZTitle: CENTRO : volume 1 : issue 4
Editors: Axiak, Victor
Abstract: Tale of contents: 1/ AGIUS, C., JACCARINI, V. - A survey of the nitrate and phosphate levels of inshore marine waters from Malta (Central Mediterranean) -- 2/ MARCHIONI ORTU, A., DeMARTIS, B. - On the biology of some rice-field weeds in Sardinia: Cotula
and Heteranthera -- 3/ FRILIGOS, N. - Preliminary Chemical and Hydrological Observations in the Ionian Sea -- 4/ BALLERO, M. - Airborne pollens analysis in Cagliari (South Sardinia): observations on Ailanthus altissima (Millar) Swingle, Casuarina equisetifolia J .R. & G. Foster and Schimus molle L. -- 5/ BAZZANTI, M., FERRARA, O., MASTRANTUOMO, L. - Composition and structure of planktonic and benthic communities as a basic information in fishpond culture -- 6/ GRAMENTZ, D. - Marine Turtles in the Central Mediterranean Sea1989-01-01T00:00:00ZA survey of the nitrate and phosphate levels of inshore marine waters from Malta (Central Mediterranean)Agius, C.Jaccarini, Victorhttps://www.um.edu.mt/library/oar/handle/123456789/375792018-12-20T02:44:22Z1989-01-01T00:00:00ZTitle: A survey of the nitrate and phosphate levels of inshore marine waters from Malta (Central Mediterranean)
Authors: Agius, C.; Jaccarini, Victor
Abstract: The nitrate and phosphate levels were monitored over a one-year period in three
inshore localities in Malta. There were recorded no seasonal variations in nutrient
levels at Marsaxlokk bay. At Mistra bay a slight decrease in nitrate-nitrogen was
recorded during the autumn and winter periods. At both these locations, how-
ever the nitrate-nitrogen was generally below llJig-atil and phosphate-phosphorus al-
ways less than 0.2 /J1.g-atll. The values are typical of most areas in the Mediterranean.
The concentrations of nutrients at Rinella creek were consistently manifold higher and
peaked during the winter months. This, very probably, reflects the combined effects of
organic pollution and rainfall on this very enclosed creek. Occasionally, short-lived high
levels of nitrates were recorded at Marsaxlokk and Mistra bays. These seem to
originate from agitation of bottom sediments.1989-01-01T00:00:00Z