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Effect of varied levels of fertilization with potassium on field pea yield and content and uptake of nitrogen

100%

Symanowicz B., Kalembasa S., Becher M., Toczko M., Skwarek K.

Acta Scientiarum Polonorum. Agricultura

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2017

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tom 16

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nr 3

2

Content of various forms of nitrogen and absorption of this element by cocksfoot grass, depending on meteorological conditions

86%

Bednarek W., Bednarek H., Dresler S.

Journal of Elementology

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2009

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tom 14

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nr 2

207-216

The dependence of the content of various forms of nitrogen and absorption of N by cocksfoot grass on meteorological conditions was established in a field experiment. Correlations between the content of total nitrogen, protein nitrogen, N-NH4, and N-NO3 in sward and roots of cocksfoot grass and some meteorological elements, i.e. maximum temperature, minimum temperature, average daily temperature measured at 5 and 200 cm, air relative humidity, cloud cover, sum of precipitation, sum of evaporation and soil temperature measured at a depth of 2, 5, 10, 20 cm were analyzed. Correlation coefficients between the forms of nitrogen in the plant and the above meteorological elements were calculated, as well as multiple regression equations, multiple correlation coefficients and determination coefficients. No significant relationship between the forms of N (Ntotal, Nprotein, N-NH4, N-NO3) in sward and roots of cocksfoot grass and the course of meteorological conditions was clearly stated. The relationship between the content of N-NH4 in sward and Ntotal and N-NO3 in roots, and certain meteorological elements is relatively small and can be characterized by the value of determination coefficients, i.e. 0.166, 0.106 and 0.151, respectively. According to the statistical analysis, the absorption of nitrogen by cocksfoot grass depends to a relatively small though significant extent (R2=0.249) on certain meteorological elements. However, further research is still recommended.

3

Monitoring of mineral nitrogen in soils in Latvia

86%

Timbare R., Janevica V., Busmanis M., Eglite K., Stalidzans D.

Nawozy i Nawożenie

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2009

|

nr 37

4

Changes in nitrogen and magnesium contents in pea under the effect of nitrogen fertilization

86%

Symanowicz B., Kalembasa S., Jaremko D., Krasuski S.

Acta Scientiarum Polonorum. Agricultura

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2020

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tom 19

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nr 4

5

The effect of ensiling in round bales on the content of nitrogen fractions in lucerne and red clover protein

86%

Fijalkowska M., Lipinski K., Pysera B., Wierzbowska J., Antoszkiewicz Z., Sienkiewicz S., Stasiewicz M.

Journal of Elementology

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2015

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tom 20

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nr 2

The aim of the study was to determine changes in nitrogen fractions during the ensiling of lucerne and red clover herbage in bales. Protein nitrogen and non-protein nitrogen compounds in herbage and silage were distinguished. Furthermore, buffer soluble nitrogen compounds (BSN) were determined and divided into buffer soluble protein and non-protein nitrogen (BSPN and NPBSN, respectively). In addition, peptide nitrogen and amino acid nitrogen were distinguished within the NPBSN fraction, while nitrogen compounds were divided into those of low solubility (NDIN) and completely insoluble (ADIN). The research findings confirmed the effect of a legume plant species on changes in the content of nitrogen fractions during the ensiling in round bales. The ensiling of lucerne herbage grossly decreased the protein nitrogen fraction while raising the total soluble fraction of nitrogen. Nitrogen in the form of soluble proteins, NDIN and ADIN was the least affected. The study demonstrated a different response of the two legume plant species to ensiling with respect to all fractions. A high proportion of protein nitrogen in round bale wilted red clover silage was accompanied by a large contribution of insoluble nitrogen fractions. A large share of the protein nitrogen fraction in red clover silage does not necessarily mean a higher nutritional value of the protein because it may contain a large amount of protein compounds that are non-hydrolysable by bacterial and intestinal enzymes.

6

Monitoring of nitrogen content in the soil and water

86%

Cermak P., Kubik L.

Nawozy i Nawożenie

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2009

|

nr 37

7

The influence of liming and mineral fertilization on the content of various nitrogen forms in spring barley

86%

Bednarek W., Reszka R.

Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura

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2009

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tom 64

|

nr 3

8

Technological properties of worts obtained from malts of naked barley grain

86%

Blazewicz J., Liszewski M., Zembold A.

Acta Scientiarum Polonorum. Technologia Alimentaria

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2007

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tom 06

|

nr 1

The purpose of the research was to determine the effect of diversified nitrogen fertilization (0, 25 and 50 kg·ha-1) on selected properties of grains, malts and brewing worts. Brewing value of barley grain was determined by Molina-Cano method. It was stated that the higher doses of nitrogen caused an increase of yield, as a result of stronger productive tillering of plants. Significant growth of grain yield was obtained by the increasing of nitrogen fertilization from 25 to 50 kg·ha-1. Malts from naked barley grain were produced in the same way as malts of the Pilzen type. According to Molina-Cano method, the naked barley grain of Rastik cultivar was qualified as brewing, because of high malt extractivity. Laboratory worts were characterized by a high extract content, but not suitable viscosity, total attenuation and low soluble nitrogen content

9

The content of mineral and protein nitrogen in red beet depending on nitrogen fertilizer type and fertilization method

72%

Szura A., Kowalska I., Sady W.

Acta Scientiarum Polonorum. Hortorum Cultus

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2008

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tom 07

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nr 3

The experiment with ‘Boro F1’ red beet was aimed at determining the effect of the kind of nitrogen fertilizer (RSM, ENTEC 26) and the manner of application (broadcasting/liquid spreading, with / without foliar nutrition) on the content of protein nitrogen in roots, and ammonium and nitrate nitrogen content in leaves and roots of red beet. The kind of applied fertilizer did not have any influence on the size of examined parameters. In 2005 foliar nutrition with nitrogen caused a decline in nitrate concentrations in leaves and roots of the plants in comparison with unnourished objects; however, such correlation was not corroborated in the following years of the cultivation. Quantities of all examined parameters were diversified depending on the cultivation year.

10

Monitoring of mineral nitrogen contents in soils of Poland

72%

Fotyma M.

Nawozy i Nawożenie

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2009

|

nr 37

11

Azot w glebach murszowatych o zroznicowanym stopniu ewolucji w dolinie rzeki Omulew

72%

Bieniek A.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2006

|

tom 513

41-48

Na torfowisku w dolinie rzeki Omulew występują gleby torfowo-murszowe wytworzone z torfów szuwarowych i olesowych, na piaskach sandrowych. Na skutek ewolucyjnych przemian związanych z odwodnieniem i zanikiem materii organicznej, przekształciły się one w gleby mineralno-murszowe, murszowate właściwe, murszaste i arenosole. Największe zasoby materii organicznej były w glebach torfowo-murszowych (1 535,9 t·ha⁻¹), a najmniejsze w arenosolach. (105,1 t·ha⁻¹). Wraz ze zmniejszaniem się ilości materii organicznej stała się ona mniej podatna na przemiany mikrobiologiczne, a stosunek C : N z 12,3 w poziomach murszowych rozszerzył się do 19,0 w utworach murszastych i 21,1 w piaskach próchnicznych arenosoli. Gleby torfowo-murszowe cechują się znaczną zawartością azotu ogólnego (53 440 kg·ha⁻¹) i intensywnymi jego przemianami. W poziomach murszowych występuje 70,0-110,1 kg·ha⁻¹ azotu mineralnego (N-NO₃ i N-NH₄) i przeważa forma azotanowa. W glebach murszowatych azot występuje tylko w poziomach powierzchniowych, w utworach murszastych jest go 8-krotnie mniej, a w arenosolach prawie 20-krotnie, i w azocie mineralnym przeważa forma amonowa. Intensywność przemian azotu ogólnego zwiększa się wraz z ubytkiem ilości materii organicznej. W arenosolach 2,26% N ogółem występuje w formie azotu mineralnego, w glebach murszastych 0,84-0,90%, a w murszach 0,38-0,47%.

12

Validation of standard values for crop nutrient off-take

72%

Karklins A., Lipenite I.

Nawozy i Nawożenie

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2001

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tom 03

|

nr 2[07]

13

Relations between enzymatic activity of soil contaminated with cadmium and content of nitrogen and phosphorus in spring barley

72%

Wyszkowski M., Wyszkowska J.

Journal of Elementology

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2005

|

tom 10

|

nr 4 Suppl.1

111-112

14

Variations of leaf economic spectrum of eight dominant plant species in two successional stages under contrasting nutrient supply

72%

Mao W., Li Y.-L., Zhao X.-Y., Zhang T.-H., Liu X.-P.

Polish Journal of Ecology

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2016

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tom 64

|

nr 1

Leaf functional traits are indicators of both plant community and ecosystem responses to environmental factors and can thus increase our capacity to understand ecosystem processes and community assembly due to climate change. The variation in leaf functional traits between succession stages in Horqin Sandy Land is caused by soil nutrient content and by intrinsic biological characteristic of species, but the effects are different. Leaf economic spectra were assessed for seven leaf traits of eight species from early and advanced stages of succession. Species from early succession stages are Agriophyllum squarrosum (L.) Moq., Corispermum macrocarpum Bge., Setaria viridis (L.) Beauv. and Pennisetum centrasiaticum Tzvel., and species from advanced successional stages are Chenopodium acuminatum Willd., Chloris virgate Swartz, Digitaria sanguinalis (L.) Scop. and Leymus secalinus (Georgi) Tzvel. All these species were grown in a greenhouse experiment under two contrasting nutrient supplies including high nutrient level (N , with 20 g of nutrient addition) and low nutrient level (N-, with no added nutrients). As expected, the resource uptake strategies of the species were affected by soil fertilization addition. Leaf nitrogen content (LNC), leaf phosphorus content (LPC), and photosynthetic capacity per unit leaf area (Aarea) significantly increased at high nutrient level but LPC is more dramatically changed than others leaf traits. Leaf life span (LLS) and specific leaf area (SLA) did not show similar tendency with succession stage. At the same nutrient level, LES still shows different pattern between the early and the advanced succession stages. Species from early succession stages have higher LPC and Aarea, compared to species from advanced stages. Species from early succession stage also tend to have higher SLA and higher LNC than at the advanced succession stage. The LLS did not show any clear changes with succession process. These results provide evidence that LES shift along the succession process is mainly caused by intrinsic biological characteristic of species.

15

Wpływ sposobu spalania na oznaczanie azotu metodą Kjeldahla

72%

Rozental L.

Roczniki Państwowego Zakładu Higieny

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1958

|

tom 09

|

nr 2

16

Effect of cultivar and harvest date of kale [Brassica oleracea L. var. acephala] on content of nitrogen compounds

72%

Korus A., Lisiewska Z.

Polish Journal of Environmental Studies

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2009

|

tom 18

|

nr 2

235-241

The level of total nitrogen, protein nitrogen, nitrates (NO₃⁻) and nitrites (NO₂⁻) was measured in the leaves of kale of the cultivars Winterbor F₁, Redbor F₁ and Średnio Wysoki Zielony Kędzierzawy. The investigation was carried out in two successive years, the raw material being harvested three times each year, i.e. 10, 14 and 18 weeks after planting seedlings in the field. Depending on the year of the investigation, the cultivar and the date of harvest, the content found in 100 g fresh matter of kale was: 0.54-0.74 g total nitrogen and 0.46-0.50 g protein nitrogen; in 1000 g the content of nitrates (NO₃⁻) was 248-2810 mg and of nitrites (NO₂⁻) 0.14-0.95 mg. In both years the highest content of total nitrogen was found in leaves of Średnio Wysoki Zielony Kędzierzawy and of protein nitrogen in Winterbor F₁. The cultivar Redbor F₁ was characterized by the highest content of nitrates and nitrites. Comparing material from the three harvest dates, average values for the year and cultivar showed that the second harvest contained 9% more total nitrogen and 4% more protein nitrogen than the first, while the third harvest contained, respectively, 17% and 8% more than the first. Nitrate content fell by 67% and 83%, respectively, and nitrite increased by 5% (but later was reduced by 46%). Nitrate and nitrite are regulated in spinach and lettuce and for this reason understanding the accumulation of these compounds is critical if regulations are developed for kale.

17

Zawartosc niektorych form azotu w glebach z gospodarstw ekologicznych

72%

Wiater J.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2006

|

tom 513

527-533

Badania przeprowadzono w gminie Zamość w roku 2000 i 2001. Obejmowały one dwa gospodarstwa ekologiczne. Próbki gleby spod warzyw, zbóż i roślin pastewnych pobrano na początku września. W próbkach tych oznaczono azot mineralny (formę azotanową(V) i amonową). Przewaga formy amonowej w azocie mineralnym, w stosunku do azotanów, wskazuje na dobre wykorzystanie przez rośliny formy azotanowej i przewagę procesu amonifikacji nad nitryfikacją. Stwierdzono, że intensywne nawożenie organiczne w gospodarstwach ekologicznych, jako źródło azotanów(V), nie zagraża środowisku naturalnemu.

18

Predicting spatial distribution of plant functional traits in a forest-steppe zone

72%

Fan S., Zhang Z.

Polish Journal of Ecology

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2021

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tom 69

|

nr 1

19

Nitrogen content and biomass: scaling from the tree to the forest level

72%

Cheng D.-L., Zhong Q.-L.

Polish Journal of Ecology

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2012

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tom 60

|

nr 4

Nitrogen is an essential nutrient for plant growth. Although much has been learned about its utilization and distribution within the plant body, little is known about the relationship between nitrogen content and standing biomass at the level of entire forests. Data for nitrogen content (N) and biomass (M) of 10 deciduous species in USA at the individual trees level and 37 species grown in three forest biomes (i.e. tropic, subtropics, and temperate) in China at stands level were gathered to determine the N versus M scaling relationships for different tissue- and organ-types (e.g. bark and leaves). Model Type II regression protocols were used to calculate scaling exponents and allometric constants (i.e. slopes and y-intercepts of log-log bivariate plots, respectively) between N and M to. At the level of individual plants, N scaled nearly isometrically with M for the different tissue- and organ-types (i.e. Nα M 0.97–1.04). At the stand-level, N scaled similarly with respect to leaf, branch, and bark M, despite differences in stand size-frequency distributions and species composition. However, total stand N scaled allometrically with respect to total stem or root M and thus to total stand mass (i.e. N α MT 0.77–0.87). This was attributed to the accumulation of wood (and other ‘necromass’ tissue components that have lower N content than physiologically active tissues) in progressively older (and thus more massive) tree stands. When coupled to the scaling of N with respect to annual plant growth rates, these exponents provide important boundary conditions with which to model forest nutrient cycling.

20

Assessment of the influence of sewage sludge fertilization on yield and content of nitrogen and sulphur in maize [Zea mays L.]

72%

Gondek K.

Journal of Elementology

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2010

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tom 15

|

nr 1

65-79

The effect of sewage sludge fertilization on nitrogen and sulphur content in maize was assessed in a pot experiment conducted in 2003-2005. The experimental design comprised the following treatments in four replications on three soils: treatment without fertilizer — (0); mineral fertilization — (NPK); farmyard manure — (FYM); sewage sludge A — (SSA); a mixture of sewage sludge A with peat — (MSSA); sewage sludge B — (SSB) and a mixture of sewage sludge B with peat — (MSSB). The tests were conducted on weakly loamy sand (SI), sandy silt loam (SII) and medium silt loam (SIII), which were collected from the arable layer (0-20 cm) of ploughed land in the vicinity of Krakow. Sewage sludge which originated from two municipal mechanical and biological wastewater treatment plants, and their mixtures with peat (the materials were mixed in a 1:1 weight ratio in conversion to dry mass of organic matter) were used in the experiment. After wet mineralization of maize biomass in concentrated sulphuric acid, nitrogen was determined using Kjeldahl method in a Kjeltec II Plus apparatus. Sulphur was assessed after material mineralization in a concentrated nitric acid using the ICP—AES method in a JY 238 Ultrace apparatus. Fertilization with sewage sludge and sludge mixture with peat acted significantly better (as noted during the three-year experimental period) on maize yields than fertilization with mineral salts. In comparison with organic material and farmyard manure applied to soil, fertilization with mineral salts significantly increased nitrogen content in maize biomass. Sulphur content grew markedly in maize biomass fertilized with sewage sludge in comparison with the concentration of this element assessed in plants treated with farmyard manure. Values of the N:S ratio in aerial parts of maize from organic material treatments was within the optimal value range. The widest N:S ratio was assessed in the aerial parts and roots of maize receiving mineral fertilizers (NPK).

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