scholarly journals Dinamica compușilor azotului mineral în apele râului Prut

2021 ◽  
Author(s):  
Petru Ciorba ◽  
Keyword(s):  
Seasonal Dynamics ◽  
Mineral Nitrogen ◽  
Nitrogen Compounds ◽  
Ammonium Ions ◽  
Autumn Period ◽  
Prut River

In this article the results on the content of mineral nitrogen compounds (ammonium ions, nitrites and nitrates) during 2020 year in the Prut River Braniște – Giurgiulesti sector are presented. In the study is examinated the seasonal dynamics of these parameters in the winter – spring – summer – autumn period. The range of ammonium ions in the waters of the Prut River varies from 0.002 to 0.26 mgN /L, of nitrite – from 0.002 to 0.02 mgN /L and of nitrates – from 0.002 to 0.73 mgN /L, the maximums being lower than in 2009-2010, and much lower than in the 80s-90s of the last century.

scholarly journals Dynamics of mineral nitrogen compounds in the waters of the Dniester River

2021 ◽  
Author(s):  
Petru Ciorba ◽  
◽  
Elena Zubcov ◽  
Nina Bagrin ◽  
Liliana Teodorof ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Water Samples ◽  
Seasonal Dynamics ◽  
Organic Nitrogen ◽  
Mineral Nitrogen ◽  
Ion Concentration ◽  
Ammonium Ion ◽  
Nitrogen Compounds ◽  
Ammonium Ions ◽  
Nitrate Ions

This article presents the results of studying the content of mineral (ammonium ions, nitrites and nitrates) and organic nitrogen compounds in water samples collected from the Dniester river in 2020. In the study are examines the seasonal dynamics of the forms of mineral nitrogen, total nitrogen and the correlation between organic and mineral nitrogen. Limits of ammonium ion concentration in the Dniester river varied between 0.002 mg N/l and 0.93 mg N/l, nitrite ions 0.002 mg N/l and 0.05 mg N/l, nitrate ions 0.002 mg N/l - 1.36 mg N/l.

Seasonal dynamics of the mineral nitrogen forms in mountain-meadow alpine soils

2010 ◽  
Vol 43 (8) ◽  
pp. 905-913 ◽  
Author(s):  
M. I. Makarov ◽  
N. A. Leoshkina ◽  
A. A. Ermak ◽  
T. I. Malysheva
Keyword(s):  
Seasonal Dynamics ◽  
Mineral Nitrogen ◽  
Nitrogen Forms ◽  
Alpine Soils ◽  
Mountain Meadow

The Azotobacter Test of Soil Fertility Applied to the Classical Fields at Rothamsted.

1932 ◽  
Vol 22 (4) ◽  
pp. 797-810 ◽  
Author(s):  
Jadwiga Ziemięcka
Keyword(s):  
Calcium Carbonate ◽  
Soil Fertility ◽  
Soil Samples ◽  
Mineral Nitrogen ◽  
Nitrogen Compounds ◽  
Phosphate Content ◽  
Plate Test ◽  
Classical Fields ◽  
Available Phosphate

Summary and abstract1. The kneaded plate (plaque moulée) method of detecting deficiency in lime and available phosphate was applied to seventy-nine soil samples taken from the classical Rothamsted arable plots, and the Azotobacter population from some of these samples was estimated by counts on silica jelly.2. The silica jelly counts showed that Azotobacter cells were very much reduced in number, or even absent in soil receiving 86 lb. per acre or more of mineral nitrogen. It is suggested that this is due to competition with other organisms whose growth is stimulated by added nitrogen compounds.3. The kneaded-plate test correctly indicaṫed whether phosphate had been applied in soils receiving little or no nitrogen manures.4. In those soils receiving 86 lb. or more of mineral nitrogen, the kneaded-plate test usually showed little or no Azotobacter growth even in the presence of phosphate and calcium carbonate. This failure was probably due to the paucity of Azotobacter cells originally present in such soil samples. In some cases the test was modified by inoculating the sample with a culture of Azotobacter and it then gave correct indications as to phosphate content.

scholarly journals OPTIMIZATION OF NITROGEN MINERAL FERTILIZATION OF AGRICULTURAL CULTURES BY THE PARAMETERS OF THE INTENSITY OF THE NITROGEN FIXATION AND DENITRIFICATION PROCESSES

2019 ◽  
Vol 30 ◽  
pp. 3-12
Author(s):  
V. V. Volkohon ◽  
S. B. Dimova ◽  
К. І. Volkohon ◽  
V. P. Gorban ◽  
N. P. Shtanko ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
N2o Emission ◽  
Mineral Nitrogen ◽  
Mineral Fertilizers ◽  
Nitrogen Compounds ◽  
Mineral Fertilization ◽  
Nitrogen Fixation Activity ◽  
Nitrogen Fertilizer Rate ◽  
Biological Nitrogen

Objective. Investigate the performance of the nitrogen fixation and process of N-N2O loss un-der the cultivation of potatoes and peas on the leached chornozem under various mineral agrarian backgrounds and the use of microbial preparations and to determine the ecological compromise normal rate of mineral nitrogen, under which the emission losses of nitrogen compounds will not exceed the intake of “biological” nitrogen in agrocenoses. Methods. Field experiment, gas chroma-tographic. Results. Studies of the activity of nitrogen fixation and N2O emission in situ in potato and pea agrocenoses using different rates of mineral fertilizers and microbial preparations, with subsequent calculations of the parameters of intake of the “biological” nitrogen and emission loss-es of the element indicate the possibility of determining the conditions (doses of mineral nitrogen) for which equality between profit and non-productive expenditure of the nitrogen balance is achieved. This amount of mineral nitrogen can be considered environmentally permissible, its ex-cess is undesirable due to a decrease in the intake of “biological” nitrogen and increased activity of the denitrification process. For potatoes grown on leached chornozem, environmentally permis-sible nitrogen fertilizer rate should be considered as 80 kg/ha, for peas — 60 kg/ha. The use of mi-crobial preparations in the cultivation of crops promotes an increase in the range of environmen-tally permissible normal rates of mineral nitrogen due to the formation of conditions under which the bacterization of plants require more nitrogen compounds to ensure a constructive metabolism, which additionally to increased nitrogen fixation activity is accompanied by an increase in the level of consumption of mineral nitrogen in the soil. At the same time, the activity of biological denitrifi-cation becomes reduced. Based on the obtained parameters, a model of optimization of nitrogen mineral fertilization of agricultural cultures was developed. Conclusion. It is advisable to deter-mine the ecologically permissible normal rates of mineral nitrogen fertilization of crops by the per-formance indices of the nitrogen fixation process and N-N2O losses. In this case, the emission losses of nitrogen compounds should not exceed the levels of intake of biologically bound nitrogen in ag-rocenoses.

SEASONAL DYNAMICS OF MINERAL NITROGEN IN THE SOIL OF APPLE ORCHARD

2020 ◽  
pp. 87-97
Author(s):  
Elena V. Leonicheva ◽  
Tatyana A. Roeva ◽  
Larisa I. Leontyeva ◽  
Maxim E. Stolyarov
Keyword(s):  
Seasonal Dynamics ◽  
Apple Orchard ◽  
Mineral Nitrogen

Floating bioplateau for treatment of waste quarry waters from mineral nitrogen compounds at the arctic conditions

2015 ◽  
Vol 19 (9) ◽  
pp. 35 ◽  
Author(s):  
G.A. Yevdokimova ◽  
L.A. Ivanova ◽  
N.P. Mozgova ◽  
V.A. Myazin ◽  
N.V. Fokina
Keyword(s):  
Mineral Nitrogen ◽  
The Arctic ◽  
Nitrogen Compounds ◽  
Arctic Conditions

scholarly journals Effect of peat samples drying on measured content of carbon and nitrogen fractions

2013 ◽  
Vol 64 (4) ◽  
pp. 130-134 ◽  
Author(s):  
Jerzy Jonczak
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Total Nitrogen ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Mineral Nitrogen ◽  
Nitrogen Compounds ◽  
Carbon And Nitrogen ◽  
Nitrogen Fractions ◽  
Initial Stage

Abstract The aim of the study was to compare the content of carbon and nitrogen fractions in fresh and dried samples of peat. The samples were extracted in 0.25 mol KCl·dm.-3, 0.25 mol H2SO4·dm.-3 and 2.5 mol H2SO4·dm.-3. Based on the extractions and analysis of total organic carbon (TOC) and total nitrogen (TN) following fractions of carbon and nitrogen were isolated: nonhydrolyzable carbon (NHC) and nitrogen (NHN), hardly hydrolyzable carbon (HHC) and nitrogen (HHN), easy hydrolyzable carbon (EHC) and nitrogen (EHN), dissolved organic nitrogen (DON), and its ammonium (NH4.-N) and nitrate (NO3.-N) form. Large differences between fresh and dried samples were observed in the content of some analyzed fractions . especially NO3.-N, NH4.-N, DON and HHC. 1.6.3.5 times higher concentrations of NO3.-N were observed in dry samples in comparison with fresh. In dried samples were also observed higher concentrations of NH4.-N and DON. In general lower concentrations of EHN, NHN, HHC and higher of HHN and EHC were observed in dried samples in comparison to fresh. Higher content of mineral nitrogen, as well as DON and DOC in dried samples, is probably an effect of mineralization of carbon and nitrogen compounds during initial stage of drying. The obtained data suggest, that the content of NO3.-N, NH4.-N, DON and EHC analyzed in dried samples of peat is overestimated. Extractions of the fractions from organic samples should be done based on fresh samples, just after sampling

scholarly journals The seasonal dynamics of phytoplankton and water quality in the Prut River lower sector

2021 ◽  
Author(s):  
Laurenţia Ungureanu ◽  
◽  
Daria Tumanova ◽  
Grigore Ungureanu ◽  
◽  
...  
Keyword(s):  
Water Quality ◽  
Seasonal Dynamics ◽  
Phytoplankton Composition ◽  
Republic Of Moldova ◽  
Qualitative And Quantitative ◽  
The Republic ◽  
Quantitative Indicators ◽  
Prut River

The article presents the results on qualitative and quantitative indicators of phytoplankton of the Prut River lower sector within the Republic of Moldova in 2018-2020. In phytoplankton compositions 72 species were identified. Seasonal and long-term patterns of phytoplankton development have been established in Prut River lower sector. The numbers of phytoplankton changed within the limits 1,06 to 20,32 mln. cell/l, with biomass 1,23-21,64 g/m3. The values of saprobic indexes, estimated on the basis of species-indicators (52 species) from phytoplankton composition, which are in proportion of 58% typically β-mezosaprobic, confirm the following: the water quality of lower Prut River sector in the period 2018-2020 was satisfactory for the development of phytoplankton and was attributed mainly to II-III (good-moderately polluted) quality classes.

scholarly journals The change of the main agrochemical indicators of the sod-podzolic soil for the submission of the municipal wasterwater under the artichoke

2021 ◽  
Vol 12 (3) ◽  
pp. 66-75
Author(s):  
V. I. Lopushniak ◽  
◽  
G. M. Hrytsuliak ◽  
Keyword(s):  
Sewage Sludge ◽  
Podzolic Soil ◽  
Soil Layer ◽  
Fertilizer Application ◽  
Mineral Nitrogen ◽  
Phosphorus Compounds ◽  
Nitrogen Compounds ◽  
Concentration Coefficient ◽  
Mobile Phosphorus ◽  
Control Variant

The studies have shown that the introduction of sewage sludge and compost made on its basis, significantly affects the change in the agrochemical parameters of the sod-medium-podzolic soil, increasing the content of the alkaline hydrolysed nitrogen compounds by 2.2 – 13.4 mg/kg of the soil compared to with control and determining the size of its values at the level of 51.2 – 56.5 mg/kg of the soil in the upper (0 – 20 cm) and 27.9 – 31.6 mg/kg – in the lower (20 – 40 cm) soil layer. The content of the ammonium nitrogen compounds in the variants with the fertilizer application fluctuated in a small range of the values (16 – 21 mg/kg of soil) and increases under the influence of increasing fertilizer doses. Together with the change in the content of the nitrate nitrogen, this contributed to an increase in the content of the mineral nitrogen compounds in the soil in the range of 18.5 – 23.4 mg/kg of the soil in arable (0 – 20 cm) and 19.8 – 21.9 mg/kg of the soil – in subsoil (20 – 40 cm) layers, which by 1.7 – 2.2 mg/kg of the soil exceeded the control variant. The highest indicators of the mineral nitrogen compounds were recorded in the variant where the highest dose of the sewage sludge was applied – 40 t/ha and mineral fertilizers (N10P14K58). Despite the wide range of the nitrogen content values of the alkaline hydrolysed compounds and mineral nitrogen compounds, their ratio remained stable and was 2.3 – 2.6 in the upper and 1.3 – 1.5 in the lower (20 – 40 cm) soil layer, and also decreased with the increasing dose of the fertilizer. That is, this indicator did not change significantly depending on the fertilizer application rate. The content of the mobile phosphorus compounds in the variants with the use of the fertilizers fluctuated in the range of the values (77.5 – 98.5 mg/kg of the soil) and increased under the influence of the introduction of the sewage sludge and compost based on it, which is 14.6 – 35.6 mg/kg of the soil was dominated by the control indicators. The highest rates of the mobile phosphorus compounds were recorded in the variant where the sewage sludge were applied – 40 t/ha and N10P14K58. The introduction of the sewage sludge at a rate of 20 – 40 t/ha contributed to an increase in the content of the potassium metabolites at the level of 89.3 – 97.2 mg/kg of the soil in the upper (0 – 20 cm) and 83.1 – 93.4 mg/kg – in the lower (20 – 40 cm) layer, which exceeded the indicators of the control variant by more than 42.1 mg/kg of the soil. The content of the potassium metabolic compounds increased somewhat less with the introduction of the composts based on the sewage sludge and straw. The results of the correlation-regression analysis indicate that the phosphorus concentration coefficient in the soil largely depends on the content of its mobile compounds and is marked by the coefficient of the determination R2 = 0.70. The potassium concentration coefficient is closely (R2 = 0.91) correlated with the content of its metabolic compounds in the soil.

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