Tag Archives: nitrogen fertilizer

418–427 A. Kasiuliene, V. Paulauskas and J. Kumpiene
Influence of nitrogen fertilizer on Cd and Zn accumulation in rapeseed (Brassica napus L.) biomass
Abstract |
Full text PDF (256 kB)

Influence of nitrogen fertilizer on Cd and Zn accumulation in rapeseed (Brassica napus L.) biomass

A. Kasiuliene¹*, V. Paulauskas¹ and J. Kumpiene²

¹Aleksandras Stulginskis University, Institute of Environment and Ecology,
Studentu str. 11, Akademija, LT-53361 Kaunas dist., Lithuania
²Lulea University of Technology, Department of Civil, Environmental and Natural
Resources Engineering, SE 971 87 Lulea, Sweden
*Correspondence: alfreda.kasiuliene@gmail.com

Abstract:

Diffuse soil contamination with heavy metals and Cd in particular is a matter of serious concern. Application of conventional remediation methods usually is not feasible due to the large territories and relatively low heavy metal content. Thus, phytoremediation is seen as an alternative. Rapeseed was grown on Cd and Zn contaminated as well as clean soil under the greenhouse conditions. Solid and liquid nitrogen fertilizers were applied during the pot experiment in order to test their influence on heavy metal accumulation in plant tissues. Vegetative parameters were measured four times during the pot experiment and it was concluded, that the elevated concentrations of Cd and Zn in the soil did not disrupt the development of rapeseed plants. Furthermore, plants from contaminated soil produced significantly bigger seeds in comparison to plants from uncontaminated soil. Calculated Bioconcentration factors for rapeseed grown on Cd and Zn contaminated soil in all cases were below unity, thus possibility to use this plant species for phytoextraction purposes is limited, but it can be successfully grown on contaminated land as an energy crop. Application of nitrogen fertilizers had a significant effect on heavy metal accumulation and decreased Cd and Zn concentrations in rapeseed roots and stems with leaves were recorded. Accumulation differences between the liquid and solid fertilizer applications were negligible.

Key words:

, , , ,




681-686 L. Narits
Effect of nitrogen rate and application time to yield and quality of winter oilseed rape (Brassica napus L. var. oleifera subvar. biennis)
Abstract |

Effect of nitrogen rate and application time to yield and quality of winter oilseed rape (Brassica napus L. var. oleifera subvar. biennis)

L. Narits

Jõgeva Plant Breeding Institute; Aamisepa 1, 48309 Jõgeva, Estonia;e-mail: Lea.Narits@jpbi.ee

Abstract:

Oilseed rape is one of the most important sources of vegetable oil in the world. Nitrogen is one of important components of oilseed rape and has strong effect on seed yield and quality. The objective of the study was to evaluate the influence of nitrogen rate and application time to yield and quality of winter oilseed rape. Field trials were carried out at the Jõgeva Plant Breeding Institute in 2007/2008 and 2008/2009. Ammonium nitrate (nitrogen content 34.4%) was used as top-fertilizer. Three different nitrogen rates: 120, 140 and 160 kg ha-1 (in active ingredient) and three different application timings were used: A) once at the beginning of spring vegetation, B) A + when the main stem was 10 cm, C) B + start of flowering in equal portions. By the results can be concluded that the amount of fertilizer had not as strong impact to seed yield and quality as fertilizer application time. The highest yields of seed and raw oil were obtained from the variant of split-N treatment (40+40+40) of 120 kg ha-1.

Key words:

, , ,