Volume 23, No. 2 (2017)

THE PRODUCTIVITY OF SOME MONOECIOUS HEMP VARIETIES (FOR FIBER AND MIXTE) UNDER THE CENTER OF MOLDAVIA ECOPEDOCLIMATIC CONDITIONS

ALEXANDRA – ANDREEA BUBURUZ(1*) , LORENA - DIANA POPA(1)

The present paper presents the results obtained regarding the evolution of stem and fiber production in monoecious hemp, under the pedoclimatic conditions of the Center of Moldova, between 2012 and 2016. The biological material used was represented by four monoecious hemp varieties created at S.C.D.A. Secuieni, respectively, Denise, Diana, Dacia – Secuieni and Ratza. The stems yields achieved, have varied widely, ranging from 7860 kg/ha at Denise variety, in 2016 (a very warm agricultural year from the thermal point of view and rainy from the pluviometric point of view), and 15167 kg/ha, at Dacia - Secuieni in 2014 (a normal agricultural year both from the thermal and pluviometric point of view). On average, during the five years studied, the highest production of fiber was obtained in the Dacia-Secuieni variety in 2014, of 5005 kg/ha, and the lowest of 2279 kg/ha at Denise variety in 2016.

NEW SELENATO TRIPHENYLTIN (IV) AND TRIMETHYLTIN (IV) DERIVATIVES: SYNTHESIS, INFRARED AND NMR STUDIES

WALY DIALLO(1), LIBASSE DIOP(1*)

Five derivatives of general formulae [cation] [SeO4SnR3] (R = Ph, Me) have been studied by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The suggested structures are infinite chains or oligomers, the environment around the tin centre being trans trigonal bipyramidal, the phenyl and methyl substituants occupying equatorial positions, the selenate anion behaving as a bridging bidentate ligand and occupying the apical positions. When cations are involved, supramolecular architectures may be obtained.

RESEARCHES REGARDING THE INFLUENCE OF THE NUTRITION SPACE AT DRACOCEPHALUM MOLDAVICA L. (DRAGONHEAD) SPECIES CULTIVATED UNDER THE CONDITIONS OF A.R.D.S. SECUIENI

MARGARETA NAIE(1*), OANA MIRZAN(1), DOBREA DANIELA-IULIANA(1)

The present paper presents the results on the influence of the nutrition space at Dracocephalum moldavica L., cultivated under the conditions of A.R.D.S. Secuieni between 2016 and 2017. Following the interaction of the factors, the distance between the rows and the distance between the plants per row was found that in the variant sown at 70 cm between the rows and 15 cm between the plants per row there was an increase in the average number of branches (2,27). The variants sown at 50 cm and 70 cm between the rows achieved deficit production, very significant compared to the control sowing at the 25 cm between the rows.

BRIDGING ENVIRONMENTAL IMPACT OF FOSSIL FUEL ENERGY: THE CONTRIBUTING ROLE OF ALTERNATIVE ENERGY

ADEKOMAYA OLUDAISI(1*), ADAMA KAYODE(1), OKUBANJO AYODEJI(2)

The demand for fossil fuel energy remains high amid challenges as it relates to its sustainability among the developing countries of the world. Nigeria remains one of the top consumption of fossil fuel energy considering the large deposit of hydrocarbon in some parts of the country. This energy has been widely used globally with attendant implication on climate and environmental crisis. In this study, attempts were made to portray the environmental impact of fossil fuel energy with attendant effect on global temperature and rising water level. Global warming, among other effect of climate change is now noticeable in all facet of the universe and key of the methodology employed in this work is to assess the existing mitigating strategy and recommend long-lasting approach as it relates to efficient energy use. Key of the conclusion from this work futures the development of municipal solid waste (MSW) as sustainable energy fuel.

DEARYLATION IN THE INTERACTIONS BETWEEN (Et3NH)HC2O4 OR (Et3NH)2C2O4 AND SnPh3Cl: INFRARED STUDY

GORGUI AWA SECK(1), LIBASSE DIOP(1*), ABOUBACARY SENE(1)

Five new oxalato, hydrogenoxalato and hydrogenocarbonato adducts (three) and complexes (two) obtained on allowing (Et3NH)HC2O4 or (Et3NH)2C2O4 to react with SnPh3Cl have been studied by infrared spectroscopy, then discrete structures suggested on the basis of spectroscopic data. The anions behave as monochelating ligands, the environments around the metallic centres being octahedral. In two of the compounds, the benzene molecules obtained in situ are lattice. In all these structures when considering the cation involved in extra hydrogen bonds, a supramolecular architecture may be obtained.

OBSERVATIONS CONCERNING THE HARMFUL ENTOMOFAUNA FROM WINTER RAPESEED CROPS IN THE CONDITIONS OF CENTRAL OF MOLDAVA, BETWEEN YEARS 2014-2017

PAULA - LUCELIA URSACHE(1*), ELENA TROTUS(1), ALEXANDRA - ANDREEA BUBURUZ(1)

During 2014-2017, 22 species were identified in the yellow bowl trap type installed in winter rapeseed crops established at A.R.S.D. Secuieni. Of these, 11 species are specific to winter rapeseed crops and 11 species were accidental identified because of the proximity with different agricultural crops (maize. sunflower. grain cereals). The highest abundance was registered by Epicometis hirta Poda species which accounted 914 specimens collected during the analyzed period. The species were integrated into classes of dominance ((D1 - subrecedent species. D2 - recedent species. D3 - subdominant species. D4 - dominant species and D5 - eudominant species). Meligethes aeneus F., Ceuthorrhyncus napi Gyll. and Epicometis hirta Poda. being considered eudominant species belonging to the D5 class. The Ceuthorrhynchus napi Gyll., Meligethes aeneus F., Epicomites hirta Poda., Psylliodes chrysocephala L., Subcoccinella 24 punctata L., Oulema melanopa L. species were classified in the constancy class - C4 - euconstant species. Meligethes aeneus F., Epicometis hirta Poda and Ceuthorrhynchus napi Gyll. species recorded the highest values for the index of ecological significance (W %) and were classified in the W5 class - characteristic species. The collected entomofauna belongs to five orders: Coleoptera, Heteroptera, Lepidoptera,. Diptera and Hymenoptera. The highest number of species (17 species) and the highest number of collected speciemens (3246 specimens) belonged to the Coleoptera order.