Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Mobilization of aluminium under acid precipitation (a laboratory experiment) in the typical soils of the Wielkopolski National Park

100%

Walna B., Siepak J., Drzymala S.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1998

|

tom 456

A laboratory simulation of acid rain was performed in which soil monoliths from the Wielkopolski National Park area were sprinkled with water solutions of sulphuric acid of pH 3.0 or 2.0, and for reference with distilled water of pH 5.6. The form and amount of the washed out aluminium as well as changes in the chemical properties of the soil studied were determined. The process of aluminium release proved particularly dangerous for acidic or slightly acidic soils which cover a large part of the National Park area.

2

Effects of soil response on mobilization and immobilization of macro- and microelements

84%

Tsyganov A., Persikova T.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1998

|

tom 456

The conditions of red clover dressing are defined to a great extent by the fertility of sward-podzolic soils. Having soil with low level of fertility (pH 5.2; P₂O₅ – 110; K₂O – 120 mg/kg of soil) after harvesting cover crop (in the fall) it is necessary to apply P₆₀K₉₀. Top dressing during the phase of budding at the beginning of clover blossom (in spring) is done with microfertilizers containing molybdenum. On soils with average level of fertility (pH 5.7; P₂O₅ – 185; K₂O – 190 mg/kg of soil) after harvesting cover crop it is necessary to apply P₄₀K₆₀ to dress clover. Top dressing during the phase of budding at the beginning of clover blossom is done with microfertilizers containing boron and molybdenum. On soils with high level of fertility (pH 6.2; P₂O₅ – 300; K₂O – 260 mg/kg of soil) after harvesting cover crop it is necessary to apply P₄₀K₆₀. Top dressing during the phase of budding at the beginning of clover blossom is made with microfertilizers containing boron.

3

Soil acidification and the mobilisation of toxic metals caused by acid deposition and fertiliser application

84%

Goulding K. W. T., Blake L.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1998

|

tom 456

The Classical and other long-term experiments at Rothamsted Experimental Station illustrate the causes and effects of soil acidification. One hundred and fifty years of precipitation measurements show how atmospheric deposition has increased, causing acidification of grassland and woodland soils. Where applied, ammonium fertilisers cause very rapid acidification unless their effects are offset by the application of lime. Acidification causes the mobilisation and removal by leaching of base cations to be replaced by aluminium, manganese or iron, the reduction of base saturation and, in the long-term, the reduction of cation exchange capacity by the weathering of clay minerals. Mobilised toxic metals are taken up by vegetation growing on the acidified soils. Some plots of the Park Grass Experiment have acidified to sufficiently to cause the release of aluminium to be taken up in hay in amounts toxic to cattle - a Chemical Time Bomb.

4

Polar chromosome mobilisation of Rhizobium meliloti L5-30

84%

Kowalski M., Dolecka J.

Bulletin of the Polish Academy of Sciences. Biological Sciences

|

1996

|

tom 44

|

nr 3-4

Ograniczanie wyników

3 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Bulletin of the Polish Academy of Sciences. Biological Sciences

1 Blake L.

1 Dolecka J.

1 Drzymala S.

1 Goulding K. W. T.

1 Kowalski M.

1 Persikova T.

1 Siepak J.

1 Tsyganov A.

1 Walna B.

3 1998

1 1996

Mobilization of aluminium under acid precipitation (a laboratory experiment) in the typical soils of the Wielkopolski National Park

Effects of soil response on mobilization and immobilization of macro- and microelements

Soil acidification and the mobilisation of toxic metals caused by acid deposition and fertiliser application

Polar chromosome mobilisation of Rhizobium meliloti L5-30