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5th section BIOLOGY RESEARCHES WITH IMPLICATIONS IN AGRICULTURE

 

RESEARCH ON BIOLOGY OF AMARANTHUS SPP. SPECIES UNDER CLIMATIC CHAMBER CONDITIONS
 
Maria TOADER, Gheorghe Valentin ROMAN
 
Universitatea de ªtiinþe Agronomice ºi Medicinã Veterinã Bucureºti
 
Abstract: The focus of our research was the study of the biology of a new species of agricultural crop – amaranthus (Amaranthus spp.), under the conditions of the climatic chamber (phytotron). Research was carried out in the interval of 23rd  April – 20th August, and allowed to establish the duration of the vegetation cycle of amaranth plants of 121 days or 651oC UTU (Σt>15oC).Under controlled conditions, the amaranthus plants formed 9 nodes on their main stem, whereas their height (measured up to the top of the final inflorescence) was 120 cm. Also, 20 leaves formed on the main stem. 100 days after the emergence, flowers started to open at the basis of the inflorescence. The flowering duration was 10 days, seeds started to form 110 days after the emergence, and the harvest maturity was recorded on 20th August.
 
Key words: amaranthus, climatic chamber, biology.
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ANATOMICAL  FEATURES  OF  THE  VEGETATIVE  ORGANS OF  SALVINIA  NATANS (L.) ALL.  (SALVINIACEAE)
 
Rodica BERCU
 
Universitatea „Ovidius”, Constanþa, România
 
Abstract: The article comprises the investigation on the structure vegetative organs of an aquatic fern, namely Salvinia natans (L.) The specific fern characters is represented, mostly, by the stem structural organization, especially those of the vascular system. The hydrophytic features such as the presence of aerenchyma well developed in the stem and submerged leaf and less in the emerged leaf are described and discussed. Remarkable is the heterogenous mesophyll with numerous chloroplasts and the blade epidermal papillae and hairs.
 
Key words:anatomy, stem, submerged dissected leaf, emerged leaf, Salvinia natans
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STRUCTURAL ORGANIZATION OF RHIPSALIDOPSIS ROSEA BACKBR. (CACTACEAE)
 
Rodica BERCU
 
Universitatea „Ovidius”, Constanþa, România
 
Abstract: The paper deals with structural organization of the root and stem of Rhipsalidopsis rosea Backbr. The results revealed that the anatomical structure of this plant justify it succulent nature, especially the water storage parenchyma, covering the major portion of the stem. The root of these species is well developed, possessing a secondary structure which gives it strength. The stem mechanical tissue is absent. Remarkable is the presence of empty circular spaces and calcium  oxalate crystals in the stem cortex and pith. The cortex covers the major portion of the stem. It is differentiated into a chlorenchymatic and a water storage tissue. The vascular system of the stele is poorly developed represented by a number of close collateral vascular bundles.
 
Key words: water storage tissue, cacti, root, stem, Rhipsalidopsis rosea.
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NOTES ON THE BEHAVIOUR OF BOVINESDURING THE STABLE PERIOD
 
R. PALICICA, Olga-Alina RADA, Mihaela Liana FERICEAN
 
Agricultural and Veterinary University of the Banat, Timiºoara, România
 
Abstract: In this paper we present a few behavioural features of the feeding and defecating, resting and sleeping, as well as body care in bovines kept in farm system, tied on a single line, during winter stable periods. As biological material, we used cows of the Brunã breed belonging to some households in Vârfurile (County of Arad), a hill area with medium yielding natural pastures. Results show that caring for bovines in this system allows a better valorising of roughage and succulents (particularly potatoes and pumpkins) and subsequently satisfactory milk yields. The defecating and the resting behaviours are optimal, in accordance with body’s demands.
 
Key words:bovines, behaviour, stable period
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NOTES SUR LA FLORE DES TERRES ARABLES ABANDONNEES DANS LA PROVINCE DU BANAT
(DEPARTEMENTS DE TIMIS ET DE CARAS-SEVERIN)
 
Gicu-Gabriel ARSENE, Ioan COSTE, Alina-Georgeta NEACªU, Alma-Lioara GRIGORIU, Ilinca Merima IMBREA, Florin-Marius FAUR, Alina-Margareta ARSENE, Daniel-Simion BISTRIAN
 
Université Agricole et Vétérinaire du Banat, Timisoara, Romania
 
Résumé On présente un inventaire floristique des cormophytes identifiées dans les jachères de 1-7 ans, pendant la période 2003-2005, dans plus de 100 parcelles et 25 localités des départements de Timiº et Caraº-Severin. L'inventaire contient environ 300 espèces dans 48 familles botaniques. Ce niveau de la biodiversité est dû au stock semencier du sol, au flux de propagules provenant des écosystèmes voisins et à la quasi-absence des mesures agronomiques. 
 
Mots-clès: jachères, terres abandonnés, biodiversité spécifique, Banat.
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LA FLORE DE LA RESERVE A NARCISSES DE FAGET-BATESTI (DEPARTEMENTS DE TIMIS)
 
Gicu-Gabriel ARSENE
 
Université Agricole et Vétérinaire du Banat, Timisoara, Romania
 
RésuméEn prolongation des recherches qui ont commencé en 2000 et publiées en 2003, on présente un inventaire floristique augmenté, avec 110 espèces. Il est exceptionnelle la présence de l'écotype de prairie humide de Fritillaria meleagris, non mentionnée jusqu'à présent dans la réserve. Les présences des narcisses et de l'espèce endémique Peucedanum rochelianum sont autant d'arguments pour renforcer le statut d'aire protégé du site.
 
Mots-clès: Narcissus poeticus, Fritillaria meleagris,  espèces protégées, Peucedanum rochelianum
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CAUSES OF PIGLET LOSSES UPON FARROWING AND THEIR IMPACT ON SOW PRODUCTION
 
I. PETROMAN, Cornelia PETROMAN
 
Agricultural and Veterinary University of the Banat, Timiºoara, România
 
Abstract: The maximum number of piglets (and, subsequently, the least losses) upon farrowing occur on farms with 500 to 1000 heads that ensure the proper monitoring of the farrowing. The largest total piglet losses occur on farms with 200 heads because of the lack of monitoring upon farrowing (4.95%), because of the crushing of the piglets by the sows (7.81%) during the first week of life, as well as because of unknown causes.
 
Key words:sows, loses upon farrowing, influence of farm size
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FACTORS INFLUENCING SOW FECUNDITY AND PIGLET NUMBER UPON FARROWING
 
I. PETROMAN, Cornelia PETROMAN, H. SÃRÃNDAN
 
Agricultural and Veterinary University of the Banat, Timiºoara, România
 
Abstract: The number of coverings influenced the percentage of fecundity in F1 hybrid primiparous sows (Marele Alb x Landrace) and the number of piglets upon farrowing, while temperature in the shed had no negative effect on these indices. Stress due to coldness did not affect the number of piglets upon farrowing, by heat during summer contributed to a lower fecundity rate and to a smaller number of piglets upon farrowing.
 
Key words:sows, fecundity, piglets upon farrowing, influence of the number of coverings and of the season
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La dispersion des espèces du Genre Carabus L.dans la zone DU Semenic
 
 Florin PRUNAR*, Jean BARLOY**, Ioan PÃLÃGEªIU*, Silvia PRUNAR*
 
*Université Agricole et Vétérinaire du Banat, Timiºoara, România
**AGRENA-ENSAR, Rennes, France
 
Résume:Cette étude présente la répartition des espèces du Genre Carabus et leur période d’activité dans le massif du Mont Semenic.
 
Mots clé: Genre Carabus L., répartition, activité, Semenic, variabilité chromatique
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LA DISPERSION DES ESPECES DU GENRE CARABUS L. DANS LA ZONE CARASOVA
 
Florin PRUNAR*, Ioan PÃLÃGEªIU*, Jean BARLOY**, Silvia PRUNAR*
 
*Université Agricole et Vétérinaire du Banat, Timiºoara, România
**AGRENA-ENSAR, Rennes, France
 
Résume:Cette étude présente la répartition des espèces du Genre Carabus et leur période d’activité dans la Zone karstique de Carasova – Anina.
 
Mots cle: Genre Carabus L., répartition, activité, Caraºova
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ENZYMOLOGICAL EVALUATION OF THE EFFECT OF SOIL MANAGEMENT PRACTICES
 
Alina Dora SAMUEL1, C. DOMUÞA2, Simona VICAª3
 
1University of Oradea, Department of Plant Biology, Oradea, România
2Agricultural Research and Development Station, Oradea, România
3University of Oradea, Faculty of Environmental Protection, Oradea, România
 
Summary: Actual and potential dehydrogenase and acid phosphatase activities were determined in the 0–10–, 10–20– and 20–30–cm layers of a brown luvic soil submitted to a complex tillage and crop rotation experiment. Each activity in both non-tilled and conventionally tilled soil under crops of both rotations decreased with increasing sampling depth. It was found that no-till – in comparison with conventional tillage – resulted in significantly higher soil enzymatic activities in the 0–10– and 10–20–cm layers and in significantly lower activities in the deeper layers. The soil under wheat or maize was more enzyme-active in the 6– than in the 2–crop rotation. In the 2–crop rotation, higher enzymatic activities were registered under maize than under wheat, excepting acid phosphatase activity. In the 6–crop rotation, higher enzymatic activities were registered under wheat, excepting actual dehydrogenase activity.
 
Key word: crop rotation, dehydrogenase, phosphatase, tillage
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APPLE TREE PRODUCTIVITY IN INTENSIVE ORCHARDS
 
 Simona Jurca
 
Banat’s University of Agricultural Sciencea and Veterinary Medicine, Timiºoara
 
Abstract Apple-tree is the major fruit species grown in the temperate climate. In 2004, the apple-tree world production was 61,919,000 tons, of which 50% (32,494,236 tons) is obtained in Asia (Draganescu, 2006).
 
Key words: apple-tree, intensive orchard, production.
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