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leaves of two sunflower hybrids: photosynthesis, electron transporz and carbon metabolism Jurnal of experimental botany 50(330): 127–138 JAN 1999 Plesnicar M. Acclimation to long

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Abstract  

Neutron activation analysis (NAA) technique has been used for the estimation of Mn, Na, and K in different varieties of oil seeds of mustard and sunflower in India. The samples were irradiated in a252Cf source with neutron flux of 109 n s–1 and the analysis was done using a multichannel analyzer (MCA) coupled to high purity germanium (HPGe) detector. Different varieties of seeds are found to have different concentrations of tracer elements when compared among themselves.

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Babu, N.K.-Vyakaranahal, B.S.-Shashidhara, S.D.-Giriraj, K. (1993): Effect of plant densities on seed quality in parental lines of BSH-I hybrid and cv. Morden of sunflower. Karnataka Journal of Agricultural

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Increasing NaCl levels retarded the net photosynthetic rate, biosynthesis of photosynthetic pigments and membrane integrity of maize and sunflower seedlings; a serious effect was exhibited when NaCl was applied at high concentration. On the other hand, the K + efflux increased at increasing NaCl levels. In addition, the various salt levels induced considerable variations in the concentrations of sodium, potassium, calcium and magnesium. The vitamins applied were generally effective in partially or completely countering the inhibitory effects of salt stress on net photosynthetic rate, pigments biosynthesis and membrane integrity, exerting a stimulatory action on these parameters, especially in plants subjected to moderate and low salinity levels. The leakage of K + was reduced by the application of both ascorbic acid (AsA) and thiamine (B 1 ). Soaking the seeds of salt-stressed plants in AsA or B 1 had a favourable effect on the accumulation of certain ions and antagonized or ameliorated the inhibitory effect of salt stress.

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Beard, B. H. — Geng, S. (1982): Interrelationship of morphological and economic characters of sunflower. Crop Sciences 22. 4. 817–822. Geng S

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235 Hall, A. J., Connora, D. J., Whitfield, D. M. 1989. Contribution of pre-anthesis assimilates to grain-filling in irrigated and water-stressed sunflower crops I. Estimates using labelled

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Kovačević V. — Banaj Dj. — Kovačević J. — Lalić A. — Jurković Z. — Krizmanić M.: 2006. Influences of liming on maize, sunflower and barley — Cereal Research Communications vol. 34. no. 1 553–556 pp. Krizmanić M

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. Pepó, P.: Borbélyné Hunyadi, É.: Zsombik, L. 2002. A napraforgó-termesztés biológiai alapjai. Gyakorlati Agrofórum. 13.1. 15.–19.p. http://www.fao.org/ag/agl/aglw/cropwater/sunflower.stm Zsombik L

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gyomirtás és termésszabályozás 2001 Torma M., Hódi L., Horn A. (2004): Study of fluminoxazin in sunflower, onion and garlic. 4th

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We studied the early vegetation dynamics in former croplands (sunflower and cereal fields) sown with a low-diversity seed mixture (composed of 2 native grass species) in Egyek-Pusztakócs, Hortobágy National Park, East-Hungary. The percentage cover of vascular plants was recorded in 4 permanent plots per field on 7 restored fields between 2006 and 2009. Ten aboveground biomass samples per field were also collected in June in each year. We addressed two questions: (i) How do seed sowing and annual mowing affect the species richness, biomass and cover of weeds? (ii) How fast does the cover of sown grasses develop after seed sowing? Weedy species were characteristic in the first year after sowing. In the second and third year their cover and species richness decreased. From the second year onwards the cover of perennial grasses increased. Spontaneously immigrating species characteristic to the reference grasslands were also detected with low cover scores. Short-lived weeds were suppressed as their cover and biomass significantly decreased during the study. The amount of litter and sown grass biomass increased progressively. However, perennial weed cover, especially the cover of Cirsium arvense increased substantially. Our results suggest that grassland vegetation can be recovered by sowing low diversity mixtures followed up by yearly mowing. Suppression of perennial weed cover needs more frequent mowing (multiple times a year) or grazing.

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