Tag Archives: nitrogen fertilizer

xxx A. Adamovics, R. Platace, S. Ivanovs and I. Gulbe
The efficiency of nitrogen fertilizer on the dry matter yield of tall fescue and festulolium grown as feedstock for combustion
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The efficiency of nitrogen fertilizer on the dry matter yield of tall fescue and festulolium grown as feedstock for combustion

A. Adamovics¹, R. Platace¹, S. Ivanovs¹* and I. Gulbe²

¹Latvia University of Life Sciences and Technologies, Liela iela 2, LV-3001 Jelgava, Latvia
²Institute of Agricultural Resources and Economics, Struktoru iela 15, LV-2006 Riga, Latvia
*Correspondence: semjons@apollo.lv

Abstract:

Grass biomass grows during one vegetation season and can be cultivated and consumed at the place of breeding. Grass biomass can be used not only in traditional feed, but, recently, also for energy production (biogas, solid fuels). The most important economic indicator for any crop is its productivity. The study found that it is important to use nitrogen fertilizer to increase the productivity of tall fescue and festulolium. A significant increase (p < 0.05) in the yield of tall fescue was observed starting from the nitrogen norm of 60 kg ha-1 N. Further increase in nitrogen fertilizer norm provides a significant increase in dry mater yield of tall fescue (reaching 8.64 t ha-1) and festulolium (reaching 8.11 t ha-1) at 180 kg ha-1 N. The analysis of linear regression coefficients of polynomials showed that the highest nitrogen efficiency in the first year of the use of tall fescue was achieved at the norm of 180 kg ha-1 N, but for festulolium – at the norm of 120 kg ha-1 N. In the following years of tall fescue use, the highest efficiency of nitrogen norms differed: in the 2nd and 4th year of use – at 60 kg ha-1 N, in the 3rd year of use – at 30 kg ha-1 N, and in the 5th year of use – at 120 kg ha-1 N. In contrast, for festulolium, in the 2nd year of use, the highest nitrogen efficiency was reached at the norm of 30 kg ha-1 N, and in the 3rd–5th year of use – at the norm of 60 kg ha-1 N.

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582–592 L. Litke, Z. Gaile and A. Ruža
Effect of nitrogen rate and forecrop on nitrogen use efficiency in winter wheat (Triticum aestivum)
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Effect of nitrogen rate and forecrop on nitrogen use efficiency in winter wheat (Triticum aestivum)

L. Litke*, Z. Gaile and A. Ruža

Latvia University of Life Sciences and Technologies, Institute of Soil and Plant Sciences
2 Liela street, LV-3001 Jelgava, Latvia
*Correspondence: linda.litke@llu.lv

Abstract:

Application of plant nutrient is one of the most important measures increasing grain yield and yield quality. Excessive application of nitrogen fertilizers leads to nitrogen leaching and it affects the quality of groundwater and surface water. The objective of this research was to evaluate the effect of nitrogen fertilizer rate on nitrogen use efficiency in winter wheat after two forecrops. The experiment was conducted at the Research and Study farm ‘Pēterlauki’ of Latvia University of Life Sciences and Technologies (56° 30.658’ N and 23° 41.580’ E) in four growing seasons: 2014/2015, 2015/2016, 2016/2017 and 2017/2018. Researched factors were crop rotation (wheat/wheat and oilseed rape (Brassica napus ssp. oleifera/wheat) and five nitrogen fertilizer rates (kg ha-1): N0 or control, N60, N120(90+30), N180(90+60+30) and N240(120+60+60). Nitrogen fertilizer affected winter wheat grain yield significantly (P < 0.001) and average grain yield increased significantly (P < 0.049) until nitrogen rate N180. But analyzing it after each forecrop separately, yield increased significantly (P < 0.05) until N120 after both forecrops. Nitrogen fertilizer affected nitrogen use efficiency (NUE), nitrogen uptake efficiency (NUpE), nitrogen utilization efficiency (NUtE) and protein content significantly (P < 0.001). When increasing nitrogen fertilizer rate NUE, NUpE and NUtE decreased, and higher results were observed at the lowest nitrogen rates. Increased nitrogen fertilizer rate also increased crude protein content in grain, and for bread baking suitable grain was obtained only with the highest N rate: N 240. Forecrop did not affect winter wheat grain yield, however, it affected NUtE (P < 0.01), NUE (P < 0.001) and nitrogen harvesting index (P < 0.001) significantly; higher results were observed when wheat was grown after wheat.

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147-156 A. Linina and A. Ruza
The influence of cultivar, weather conditions and nitrogen fertilizer on winter wheat grain yield
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The influence of cultivar, weather conditions and nitrogen fertilizer on winter wheat grain yield

A. Linina* and A. Ruza

Latvia University of Agriculture, Faculty of Agriculture, Institute of Agrobiotechnology, Liela iela 2, Jelgava, LV3001, Latvia
*Correspondence: anda.linina@llu.lv

Abstract:

Winter wheat (Triticum aestivum L.) is one of the most productive and significant cereal species in Latvia used for food grain production. The aim of the research was to evaluate winter wheat grain yield depending on nitrogen fertilizer rate, crop-year (meteorological conditions) and cultivar and determine the impact and interaction of research factors on grain yield. Field experiments with winter wheat cultivars ‘Bussard’ and ‘Zentos’ were conducted at the Latvia University of Agriculture, Study and Research farm Peterlauki during a three year period (2009/2010, 2010/2011 and 2011/2012). Nitrogen (N) was applied (N60, N90, N120, N150 kg ha-1) in spring after resumption of vegetative growth. Assessment of both winter wheat cultivars showed that crop-year, cultivar, nitrogen fertilizer, crop-year × cultivar had a significant (p < 0.05) impact on grain yield. Nitrogen fertilizer did significantly (p < 0.05) affect the grain yield of winter wheat, treatment with N90 showed of yield increase, compared to N60, while further use of increasing amounts of N fertilizer did not increase grain yields significantly. Results suggest, that winter wheat grain yield by 34% depended on cultivar, by 33% on crop-year (weather conditions), and by 13% on crop-year × cultivar. Influence of the nitrogen fertilizer effect was small – 3%. Medium strong positive correlation was found between HTC in the vegetation period from winter wheat heading to grain ripening.

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

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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)
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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.

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