Authors:M. L. A. Tavares, N. Queiroz, I. M. G. Santos, A. L. Souza, E. H. S. Cavalcanti, A. K. D. Barros, R. Rosenhaim, L. E. B. Soledade and A. G. Souza
In Brazil, the vegetable oils more commonly used for obtaining biodiesel are oils from soybean, castor bean fruit, sunflower, cotton, palm, and others [ 3 , 4 ].
The oxidation resistance is an important issue for the life cycle of biodiesel
Authors:V. Kovacevic, D. Banaj, J. Kovacevic, A. Lalic, Z. Jurkovic and M. Krizmanic
Aim of this study was testing of field crops (maize-maize-sunflower-winter barley rotation) to lime (carbocalk: waste of sugar factory, 39% CaO) application in five rates up to 90 t/ha. Field trial was conducted in autumn 2000 in four replicates. Liming with carbocalk resulted with considerable increases of field crop yields as follows: up to 50% and 36% (maize for 2001 and 2002, respectively), up to 49% (sunflower 2003) and up to 30% (barley 2004). In general, by application of carbocalk to level of 90 t/ha, yields drastically decreased mainly to level of control as affected by over liming. Concerning oil contents in sunflower grain, it was significantly higher compared to control for treatments 15, 30 and 45 t/ha, but similar for control and 60 t/ha. Using of 45 and more lime per hectare decreased grain quality of malting barley because protein contents were significantly increased.
Authors:S. Subbulakshmi, P. Subbian, N. Saravanan and N. Prabakaran
A field experiment was conducted during the
(October–January) seasons of 2005–2006 to study the effect of a maize — sunflower cropping system on the weed flora shift. The results revealed a change in weed species, i.e. the appearance of new species and the elimination of certain weed species due to the cropping system. The density of
was high during the 1
year maize cropping period, but
became dominant when sunflower was grown after maize.
, originally the dominant sedge, was smothered by
due to zero tillage.
was the dominant weed species in maize, while
was the dominant weed species in sunflower. The proportions of
Datura fastuosa, Parthenium hysterophorus, Trianthema portulacastrum, Amaranthus viridis, Amaranthus polygamus, Flaveria austerlagica, Gynandropsis pentaphylla
were higher during the 1
year maize cropping season, while later their density was gradually reduced due to the inclusion of sunflower in the system.
Authors:Magdalena Troć, A. Skoczowski and Małgorzata Barańska
The extracts from sunflower and mustard leaves were separated using SPE-Columns. The mustard seeds were germinated on water
(24 h) and subsequently on crude extracts or separate fractions. The heat production rate was measured by isothermal calorimetry
at 21°C and changes in seed cotyledons by FT-Raman spectroscopy. Crude extracts strongly inhibited seed germination. The water
and ‘methanol’ fractions of mustard and sunflower extracts have a similar influence on the pattern of heat efflux. FT-Raman
spectroscopy showed that extracts caused changes in cotyledons mainly in the content of fatty acids, carotenoids and flavonoids.
Isothermal calorimetry and Raman spectroscopy are useful for the study of allelopathic interactions.