Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The effect of crop rotation on the stability of soil aggregate

100%

Kesik T.

International Agrophysics

|

1994

|

tom 08

|

nr 1

2

Soil solution chemistry in the profiles of forest and arable soils developed from loess

86%

Smal H., Misztal M., Bril J.

Polish Journal of Soil Science

|

2000

|

tom 33

|

nr 1

3

Platinum ions effect on heavy metals ions in the loessial soil. Part I. Zinc ions

86%

Bojanowska M., Jackowska I.

Ochrona Środowiska i Zasobów Naturalnych

|

1999

|

tom 18

4

Assessment of the porosity of soil samples according to the method of stereological analysis

86%

Bodziony J., Konstankiewicz K., Mlynarczuk M., Ratajczak T.

International Agrophysics

|

1993

|

tom 07

|

nr 1

5

Measurement of water characteristics in soils using TDR technique: water characteristics of loess soil under different treatment

86%

Walczak R. T., Slawinski C., Malicki M., Sobczuk H.

International Agrophysics

|

1993

|

tom 07

|

nr 2-3

6

Characteristics of humic acids from under crop rotations with differentiated cereal share

86%

Flis-Bujak M., Zukowska G.

Acta Agrophysica

|

2001

|

tom 52

This paper presents the results of studies carried out to estimate the influence of crop rotation, with diversified cereal shares on the humic acid characteristics. The tested range covered humic acids separated from the following soil types: degraded chernozem developed from loess, Orthic Luvisol developed from boulder clay, Orthic Luvisol developed from loess. Samples"were taken from the soil arable layer being under many-year crop rotation with a differentiated share of cereals (50 and 100%). The results obtained show that soil use affected quality indices of humic acids. In the lessive soils under cereal monocultures, an increase of the atomic H:C ratio was observed in humic acids. This allows for a conclusion that the monoculture system causes an increase in the content of aliphatic structures in humic acid molecules or a decrease in the condensation degree of their nuclei. Moreover, a decrease in the optic density of humin solutions given in A465 values was found in the humic acids under cereal monocultures which proves a marked direction of changes. In the case of humic acids extracted from chernozem, an analysis of elemental composition did not show any clear differentiation in the crop rotation with a 50% cereal share and a monoculture of cereal plants. The analysis of optic properties indicates a growth of the optic density (value of the E4:E6 ratio decreases) in the variant with a cereal plant monoculture which may suggest growth in the humification of individual humic acids.

7

Formation of exchangeable cation content in loess soil depending on the land use and mineral fertilization

86%

Kaniuczak J.

Acta Agrophysica

|

2001

|

tom 52

Studies of the content of exchangeable cations were carried out in 1986-1993 in Rzeszów Submountain„region. The following land uses were considered: forest virgin soil, arable soil - productive field and experimental field. In two fertilization experiments varried NPK+Mg and NPK+Mg+Ca fertilization was applied with plant cultivation in the cropping system (static fertilization field). The experiment was carried out on the clay, very acid grey-brown podzolic soil. It was found that after 8 years of research the exchangeable Ca, K and Na content was the lowest in the Ah/Eet and Bt horizons of forest soil, but the exchangeable Mg content was the highest. In the experimental field the highest content of exchangeable Ca was in the Ap and Bt horizon of limed soil, exchangeable Mg in Ap and Bt horizon of limed soil and non-limed one. The content of exchangeable K was very differentiated. The highest content of exchangeable Na was in Ap horizon of limed soil.

8

Natural aspects of a new approach to erosion of loess soils in Poland

86%

Turski R., Slowinska-Jurkiewicz A., Paluszek J., Debicki R.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 400

Up-to-date studies on erosion, including erosion on loessial soils, are based on the division of an actual topographic surface into three zones assumed a 'priori': top area, eroded slope area and foot-hill area as depositional area. As the main research method for the field survey the soil-levelling cross-section has been used most frequently. Although this method allowed us to introduce erosion protection measures in the form of antierosion fields, however, these measures did not work properly in practice because of two reasons: 1) insufficient recognition of the soil cover variability on the basis of soil-levelling cross-sections for establishing the agroecological zones, and 2) basing the analysis of erosion effects mainly on the course of chemical properties. A new approach, described in this paper, evaluates the soils in the eroded loessial region also on the basis of their physical properties. A point valorization scale was developed basing on eight physical and two chemical features of the eroded soils. Computed synthetic valorization indices allow us to classify the uneroded, totally eroded or deluvial soils into the category of good soils, while those being slightly, moderately or severely eroded are classified as medium quality soils.

9

Plant response to surface crust

86%

Debicki R.

International Agrophysics

|

1994

|

tom 08

|

nr 1

10

Annual variations of soil erodibility of silt loam developed from loess based on 10-years runoff plot studies

72%

Rejman J., Brodowski R., Iglik I.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

|

2008

|

tom 39

Results of 10-years runoff plot experiments carried out on two sites of the Lublin Upland were presented. Despite similar soils and climatic conditions, studies showed large differences in annual soil erodibility (K factor of the USLE) between both sites. Experimentally derived values of the factor were dependent on tillage direction and time of maintaining runoff-plots in fallow conditions. On a site cultivated in contour direction, 4-year period was insufficient to achieve K values similar to the predicted values from the USLE. In contrast to this, on a site cultivated up-down slope, similar experimental and predicted K values were obtained after 2 years and remained at the same level during next 4 years. Results enabled to identify limitations of the USLE application for erosion prediction in Poland. Studies proved that soil erodibility could be used for prediction of erosion risk for silt loam developed from loess. However, application of soil erodibility approach to the event–base models is questionable for variation of K factor in the initial years. As far, the factors affecting soil erodibility changes are not recognized and need further research.

11

The effect of slope gradient on plant cover index (C) of faba bean crops grown on loess soil

72%

Klima K., Chowaniak M.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

|

2008

|

tom 39

In a period from 2002 to 2005, a single-element field experiment was conducted at the Experimental Station in Mydlniki near Cracow. The field top soil was a brown loess-derived soil. The main objective of the experiment was to determine the effect of slope gradient on the plant cover index C of small bean crops. The impact of two slope gradients (9% and 16%) on the level of surface soil losses was studied, as was, in the experiment, the amount of surface soils exported from fallowed plots and from the plots grown with faba beans. The experiment on the impacted 22.13 × 1.87 m plots was four times repeated in each gradient zone. It was stated that the plant cover index C was 0.187 in the case of faba beans grown and cropped on the slopes showing a 16% gradient, and, it was 0.154 on the slopes with a 9% gradient. The impact of the total area of plant top ends expressed by an index called LAI (Leaf Area Index) on the value of index C is described by exponential functions, i.e. in the case of slope gradient being 16%: y = 0.6081e–0.6016x, and the slope gradient of 9%: y = 0.5447e–0.6341x.

12

Improvement of water-air properties of eroded soils in a loess landscape after the application of agrohydrogel

72%

Paluszek J., Zembrowski W.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

|

2008

|

tom 39

The research was carried out in a fi eld experiment in eroded Haplic Luvisols developed from loess at a privately owned farm in Bogucin (51°20’N, 22°23’E) at the Lublin Upland. After spring wheat had been sawn, 9 plots with an area of 9 m2 each, including 3 control plots, were marked out. AgroHydroGel was spread over in the doses of 1 gּ kg–1 and 2 gּ kg–1 recalculated to dry soil) and mixed within the 0–5 cm layer of soil. AgroHydroGel is a cross-linked hydrophilic polyacrylamide copolymer with water absorption of 300–500 gּ cm–3. Soil samples were collected in June and August 2005 at the layer of 0–5 cm. The results of this study indicate that the use of AgroHydroGel in the doses of 1 and 2 gּ kg–1 improved the majority of the water-air properties in the soil surface layer. The bulk density decreased signifi cantly hereas the maximum water capacity, saturated hydraulic conductivity, total porosity, content of macropores > 20 μm, actual air permeability and permeability at fi eld water saturation were signifi cantly higher. The polymer dose of 2 gּ kg–1 was more effective, increasing signifi cantly also fi eld water capacity in the soils studied. The applied doses of the hydrogel did not change signifi cantly actual soil moisture, retention of water useful to plants, including retention of easily available water, and content of water-stable aggregates < 0.2 μm in diameter. A more benefi cial effect of AgroHydroGel on water-air properties of the eroded soils was found in August.

13

Wpływ wieloletniego użytkowania sadu jabłoniowego na wybrane właściwości chemiczne gleb wytworzonych z pyłów

72%

Pranagal J., Ligeza S., Smal H., Gmitrowicz-Iwan J.

Acta Agrophysica

|

2018

|

tom 25

|

nr 4

14

Influence of long-term organic fertilization on the enzymatic activity

72%

Koper J., Piotrowska A.

Acta Agrophysica

|

2001

|

tom 52

Mineral and organic fertilization is one of the rtiost important factors affecting activity of soil enzymes. It is commonly accepted that organic fertilization is more beneficial to the soil biological activity than the mineral. The objectives of this investigation were to assay Corg, Ntot, Ptot content and to determine urease and amylase activities in the soil fertilised for a long time with various rates of farmyard manure and slurry. Soil samples were taken from the experiment established on a typical lessivé soil. FYM was used at the following rates: 20, 40, 60, 80 t ha-1 fresh weight once in the rotation on the plots with potatoes, while slurry was applied in four doses corresponding to manure fresh weight. Soil samples were taken after potato harvest in the 8th year after the experiment start-up from two depths: 5-15 and 25-35 cm of the soil profile. Usually, higher amounts of Corg and Ptot were found in the soil manured with FYM in comparison with the pig slurry-manured soil. These amounts increased when the doses of both fertilizers were the highest. The content of Corg ranged from 5.5 to 8.2 g kg-1 of soil when 80 t ha-1 of FYM was used. Total nitrogen ranged from 0.45 to 0.95 g kg-1 of soil, average for doses of both fertilizers, whereas total phosphorus content ranged from 0.26 to 0.48 g kg-1 of soil. The highest amylase activity was observed in the soil when FYM was used (0.48 ng starch g-1 l6 h-1) as compared to the soil where slurry was applied (0.41 g starch ug-1 16 h-1). No increase of amylase activity was observed when the doses of both fertilizers were the highest. A higher urease activity was noted when FYM was used than in the case of the soil manured with slurry.A decrease of urease activity was noted in the control samples (3.0 mg NH3 10 g-1 24 h-1), while the urease activity increased when the doses of both fertilizers were the highest. The highest activities were noted when 80 t ha-1 of FYM or slurry were used.

15

Evaluation of erosional factors according to RUSLE in loessial belt of Lublin upland [SE Poland]

72%

Debicki R., Rejman J., Turski R.

International Agrophysics

|

1994

|

tom 08

|

nr 1

16

Influence of long-term liming on aggregate stability of a loess-derived soil

72%

Becher H. H.

International Agrophysics

|

2001

|

tom 15

|

nr 2

17

Effect of platinum ions on the heavy metal ions in loessial soil. Part I: Copper ions

72%

Bojanowska M., Jackowska I.

Acta Agrophysica

|

2001

|

tom 51

Studies on the possibilities of activating heavy metal ions by platinum ions in the soil have been undertaken. The present work gives results of research on the copper ions activated in loessial soil by the treatment with solutions containing platinum ions. Samples of podzolic soil developed from loess were collected from the horizon Ap (0-20 cm). The samples were treated with re-distilled water or with the same quantity of PtCl4 water solutions containing 2, 4, 20 mg of platinum ions. Soil reaction (pH) was measured after 1, 2, 3, 4, 5 and 6 months of incubation at 5 and 20 °C temperature. Copper ion content was determined in the filtrates using the technique of atomic absorption spectrometry. The amount of copper ions activated in the soil material depended on the soil reaction, temperature, quantity of platinum ions introduced and the time duration of the experiment.

18

Water erosion of agricultural loess catchment in Trzebnica Hills

72%

Szefranski S., Zmuda R., Licznar P.

Acta Agrophysica

|

2000

|

tom 35

Catchment of the Mielnica Stream is situated in Trzebnica Mills area, covered with loess soils and under an intensive agricultural use, Bathometrical and hydrometrical measurements were taken in the hydrological years 1982/83-1993/94. Daily and periodical masses of a suspended load carried out through the hydrometrical cross-section, flow and unit run-off rates were analysed. The weight of total measured annual sediment ranged from 2.56 Mg to 295.94 Mg. Value of the mean annual flow rate, at the catchment closing cross-section, ranged from 8 to 191s-1 and the maximum daily values from /8 to 434 /s-1. Additional analyses of water chemical composition were made in the years 1988-1990. Sixteen different chemical compounds and elements were investigated. Calculated chemical denudation indices were determined by the hydrometeorological conditions.

19

Altitudinal morphoclimatic differentiation of areas of younger loess accumulation in Europe

72%

Maruszczak H.

Biuletyn Peryglacjalny

|

1996

|

tom 35

20

Some chemical and physical properties of soils derived from sandy-silt and loess formations under different management

72%

Witkowska-Walczak B., Turski M., Lipiec J.

Acta Agrophysica

|

2002

|

tom 78

Ograniczanie wyników

The effect of crop rotation on the stability of soil aggregate

Soil solution chemistry in the profiles of forest and arable soils developed from loess

Platinum ions effect on heavy metals ions in the loessial soil. Part I. Zinc ions

Assessment of the porosity of soil samples according to the method of stereological analysis

Measurement of water characteristics in soils using TDR technique: water characteristics of loess soil under different treatment

Characteristics of humic acids from under crop rotations with differentiated cereal share

Formation of exchangeable cation content in loess soil depending on the land use and mineral fertilization

Natural aspects of a new approach to erosion of loess soils in Poland

Plant response to surface crust

Annual variations of soil erodibility of silt loam developed from loess based on 10-years runoff plot studies

The effect of slope gradient on plant cover index (C) of faba bean crops grown on loess soil

Improvement of water-air properties of eroded soils in a loess landscape after the application of agrohydrogel

Wpływ wieloletniego użytkowania sadu jabłoniowego na wybrane właściwości chemiczne gleb wytworzonych z pyłów

Influence of long-term organic fertilization on the enzymatic activity

Evaluation of erosional factors according to RUSLE in loessial belt of Lublin upland [SE Poland]