Wyniki wyszukiwania - AGRO

1

Gleby wymagaja wapnowania

100%

Cwynar A.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

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1994

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nr 09

8-9

2

Grenzwerte fur Schwermetalle und organische Schadstoffe in Boden

100%

Janssen E.

Nawozy i Nawożenie

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2000

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tom 02

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nr 3b

3

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Influence of polyacrylamide flocculants on physical properties of two pseudopodzolic soils

100%

Hajnos M., Sokolowska Z.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1996

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tom 436

Two nonionic flocculants, Magnafloc 351 and Rokrysol WF-1, have been applied in different doses to two pseudopodzolic soils: sandy and loessial. The filtration rate, evaporation and aggregate stability have been measured. The amount of the leached flocculants has been used as an estimation of their bonding force to the soil phase. The investigated soil properties have been improved under the influence of both flocculants, in different degree depending on the kind of soil. Physical properties of PAM-modified soils are quite similar.

4

Characteristics of humic acids extracted from soils by the capillary electrophoresis

100%

Grzelakowska A., Christy A.

Polish Journal of Soil Science

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2003

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tom 36

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nr 2

145-152

Humic acids have an important role in the soils. When specific structures of which little is known, are studied, one should use the latest analitycal methods. So far the method of fractionation by electrophoretic mobility has not been very popular in the research studies on humic substances. However, it seems that it is possible to study humification processes and subtle changes in the structure of the material investigated using capillary electrophoresis. On the basis of our experience, some soils representing various types were selected as study material. Electrophoretic separation (by means of buffer solutions with various pH-values) was carried out for the humic acids extracted from the soils selected. The results obtained allowed for the determination of differences in the humic acids structures due to their origin.

5

Formirovanie prostranstva priznakov dlja raspoznavanija pochv s ispol'zovaniem mul'tifraktal'nogo analiza

100%

Smil'skijj V., Sidorchuk A.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

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nr 4

6

Influence of previous crop on winter barley yield and its components

100%

Malecka I., Pudelko J., Rozalski K.

Fragmenta Agronomica

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1995

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tom 12

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nr 2

7

Investigations of sequential extraction of chromium from soil

100%

Kalembkiewicz J., Soco E.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 3

The sequential extraction of Cr from soil to soil eluates was studied. The influence of conditions of soil sample preparation and conditions of eluates obtained in the final result of Cr extraction from soil and its determination were found. Conditions protecting the total extraction of Cr from soil to solutions were established.

8

Relict features of mucuous soils in the Kurpie Plain

100%

Lachacz A., Piascik H.

Polish Journal of Soil Science

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2004

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tom 37

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nr 2

The area of Kurpie Plain features mucuous soils (sandy humous soils) containing from 3 to 10% of organic matter in the humus (top) layer. These soils developed from loose sands of fluvio-glacial origin. The morphology of these soils indicates the prior processes of podsolization and gleyization. The profile distribution of those elements soluble in 20% HCl as well as free iron, indicate the podzolization effect.

9

Effect of management of a volcanic ash soil on structural properties

100%

Ellies A., Horn R., Smith R.

International Agrophysics

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2000

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tom 14

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nr 4

10

Studies of the effectiveness of Cu2plus, Co2plus and Cr3plus desorption with Kplus in grey-brown podzolic soils

100%

Paszko T., Gaszczyk R., Muszynski P.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 2

Model studies were carried out using the three-component CuCl2, CoCl2 and CrCl3 solution in two greybrown podzolic soils. After saturation of soil with the three-component solution and elution with water, desorption was carried out with the 0.1 mol dm-3 KCl solution. For comparison, desorption with the NH4Cl, CaCl2 and MgCl2 solutions was also conducted. Desorption of Cu2+ with K+ was in both soils similar to that of NH4 + and Mg2+ but smaller in comparison with Ca2+. In the case of Co2+ desorption with the studied exchangeable cations was not differentiated. Desorption of Cr3+ with K+ and NH4 + was greater than with Ca2+ and Mg2+. The differences in desorption efficiency can be explained based on the theory of hard and soft acids and bases (HSAB).

11

Determining bulk electrical conductivity of soil from attenuation of electromagnetic pulse

100%

Malicki M. A., Kokot J., Skierucha W. M.

International Agrophysics

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1998

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tom 12

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nr 3

12

Spectrophotometric determination of cadmium [II] in soil of allotment gardens in Lodz

100%

Jankiewicz B., Ptaszynski B., Wieczorek M.

Polish Journal of Environmental Studies

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2000

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tom 09

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nr 2

Cadmium was determined in the soil of six allotment gardens of Lodz, situated in areas with different traffic patters (the centre of the city and its suburbs). It was determined in the form of cadmium (II) dithizonate by the extraction-spectrophotometric method.

13

A response surface methodology for determination of engineering properties of soil in situ

100%

Rubinstein D., Upadhyaya S. K., Sime M.

International Agrophysics

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1994

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tom 08

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nr 1

14

Soils at the Arctowski Station, King George Island, maritime Antarctic

100%

Blume H. P.

Polish Journal of Soil Science

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2004

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tom 37

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nr 1

Soils around the Polish Arctowski Station, Maritime Antarctic were mapped and studied in the lab. They were formed from Tertiary basalt, moraines and solifluction deposits, partly influenced by recent volcanic ash. Regic and Leptic Cryosols as well as Gelic Leptosols on steep slopes without or low vegetation cover were found, whereas very young moraines had Calcari-vitric Cryosols. Moderate slopes below 60 m a.s.l. had Molli-gelic Cambisols with a dense grass cover, whereas the lowlands near the station had Histic and Salic Fluvisols Most soils below 60 m a.s.l. had higher phosphate contents due to the influence of birds, particularly penguins. Cryoclastic weathering together with cryoturbation were the main soil forming processes but chemical weathering took place also. The appearance of pedogenetic iron oxides as well as illites, smectites and allophane in the clay fraction indicate solution-chemical weathering and the new formation of minerals. Some of the soils were influenced by water stagnation, others by ortstein formation. Relatively high contents of organic matter are the result of an absolutely low biomass production but higher in relation to the activity of soil microbes, together with influences of cryoturbation and of the birds.

15

A comparative study of sequential extraction procedures for manganese speciation in soils

100%

Kalembkiewicz J., Sitarz-Palczak E.

Polish Journal of Soil Science

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2002

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tom 35

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nr 2

16

Agrochemische Bodenuntersuchung in der Slowakei ihre Entwicklung und Gegenwartige Lage

88%

Kotvas F.

Nawozy i Nawożenie

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2000

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tom 02

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nr 3b

17

Environmental status of the Arctic soils

88%

Nikitina M., Popova L., Korobitcina J., Efremova O., Trofimova A., Nakvasina E., Volkov A.

Journal of Elementology

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2015

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tom 20

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nr 3

The Arctic region is under an ever-increasing anthropogenic influence. The nature in the Arctic is extremely vulnerable to the effects of pollutants, which may eventually lead to certain irreversible ecological processes. Heavy metals occupy a special place among priority pollutants. Therefore, the aim of this study has been to assess the ecological status and the degree of contamination with heavy metals of the soils of Arctic and sub-Arctic areas. Arctic soils were studied in the region of the White Sea and the Barents Sea during the Arctic Floating University, a research expedition held in July 2012 by M. Lomonosov Northern (Arctic) Federal University. During the expedition, samples were collected and the landscapes (topography, vegetation) were described. In order to assess the impact of environmental contamination, the total content of heavy metals in soils was evaluated by X-ray fluorescence analysis (XRF). The level of soil contamination was assessed according to the maximum permissible concentrations ( MPC), temporary permissible concentrations (TPC), chemical substance factor (Kc) and the total pollution index (Zc). Our analysis of the experimental data showed a wide-range change in the soil agrochemical parameters. It has been demonstrated that the investigated soils of the Arctic and sub-Arctic areas represent different soil properties, are affected by different climatic conditions and belong to different texture taxonomic classes, e.g. the grain-size distribution varies from sand to clay loam; the pH ranges from strongly acid to neutral and the content of organic substances can be very low to high. According to the total pollution index, almost all the soils present an acceptable heavy metal contamination level. In most of the studied soils, the heavy metals in terms of amounts accumulated can be ordered as follows: Co > Pb > Cu > Zn > As > Ni > V > Mn.

18

Method to estimate water permeability functions of moderately wet soils with help of heat pipe technique

88%

Globus A. M., Gee G. W., Fayer M., White M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1996

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tom 436

Water permeability of moderately wet soils, i.e., their unsaturated hydraulic conductivity and water diffusivity are seldom measured directly, yet are often needed by numerical models to simulate transport processes. These functions can be evaluated from steady state water content and temperature profiles in heat pipes - closed columns of uniformly moistened soil subjected to temperature gradient. For such systems Sw = DT/D(θ) = -dθ/dT where Sw is the thermogradient coefficient, DT is the thermal water diffusivity, D(θ) is isothermal water diffusivity and dθ/dT is the rate of change of water content with temperature deduced from steady state profiles of θ(x) and T(x), x - is the distance from one of column ends. DT varies in a relatively narrow range and can be assumed as a constant.Then D(θ) can be estimated as DTSw where Sw is measured in various locations along soil columns. Using water retention data, the steady water content profile can be procedure for estimating D(θ) can then be applied to estimate hydraulic conductivity, K(θ). Soil columns ranging in length from 5 to 10 cm, exposed to thermal gradients of l°C/cm for periods as short as 7 d, at initial suction values ranging from 1 to 1.5 MPa, can be used to estimate D and K with uncertainties of factor of five or less in the suction range from 0.03 to 3 Mpa.

19

Sugar beet breeding- rapid screening technique for nematode resistance

88%

Kozak-Stankiewicz K., Szkudelski J., Sitarski A., Piszczek J.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin

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2019

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nr 285

20

Effect of herbicides on the course of ammonification in soil

88%

Kucharski J., Bacmaga M., Wyszkowska J.

Journal of Elementology

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2009

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tom 14

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nr 3

477-487

A laboratory experiment has been performed to determine the effect of soil pollution with the herbicides: Harpun 500 SC, Faworyt 300 SL, Akord 180 OF and Mocarz 75 WG on the course of ammonification. The soil material for the experiment consisted of loamy sand of pH 6.5. The experiment comprised five replications. Soil samples in particular objects were polluted with the herbicides at rates corresponding to the dose recommended by the manufacturer: 0 – control, 1 – a dose recommended by the producer, and the rates 50-, 100-, 150- and 200-fold higher than the recommended dose. Next, nitrogen was introduced to soil in the form of L-aspartic acid, DL-alanine, L-arginine and urea in the amounts of 0 and 300 mg N kg-1 soil. Having been thoroughly mixed with the additional substances, the soil was brought to moisture equal 60% capillary water capacity and incubated for 12, 24, 36 and 48 hours at 25oC. The study has demonstrated that the course of ammonification depended on the type and rate of a herbicide added to soil, type of an organic compound undergoing ammonification and duration of the trial. L-arginine was ammonified most rapidly, while ammonification of L-aspartic acid lasted the longest. Among the tested herbicides, the strongest inhibitory effect on ammonification process was produced by Mocarz 75 WG, which continued to exert negative influence on mineralisation of organic substances for 36 hours. The other preparations did not have such a considerable effect on the quantities of ammonified nitrogen.

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