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Potassium forms in soil

100%

Skarpa P., Hlusek J.

Acta Agraria et Silvestria. Series Agraria

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2003

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tom 40

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nr Sek.roln.

The dynamics of potassium in the soil was investigated in long-term small-plot field trials at the three stations (Tab. 1), where was used five variants of fertilisation (Tab. 2). The aim of experiment was to determine the effect of mineral fertilisers and organic manures on K balances and content its forms in soil. The level of the potassium in three forms: water-soluble K, available K and mobile K reserve were determined. The water-soluble K was most influenced by the graded dosages of fertilisers. The content of water-soluble K and available K increased about two times compared to first variant (no fertilised), 100.6% (Tab. 3) and 96.6% respectively (Tab, 4). The level of mobile K reserve was not influenced by the fertilisation (Tab 5).

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Effect of different potassium soil levels and forms of potassium fertilizers on micro-elemental nutrition status of apple trees in early fruition period

72%

Szewczuk A., Komosa A., Gudarowska E.

Journal of Elementology

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2009

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tom 14

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nr 3

553-562

The experiment was established in the spring of 1999 on grey brown podsolic soil formed from boulder clay. Apple trees of cv. Golden Delicious were planted on rootstock at 3.5×1.2 m (2381 trees⋅ha-1). The first factor in the experiment consisted of the levels of potassium in the arable soil layer: 120, 160 and 200 mg K⋅kg-1 of soil d.m., on the basis of annual chemical analyses and determined by universal method. The second factor comprised three forms of potassium fertilizers: potassium chloride (KCl-60%), potassium sulphate (K2SO4) and potassium nitrate (KNO3). Each year the analyses of macro- and microelements in the soil and leaves were made. The increase in available potassium levels from 120 to 200 mg K⋅kg-1 of soil d.m did not have influence on the content of available forms of iron, manganese, zinc, copper and boron in the herbicide fallow strips in the tree rows or in the arable (0-20 cm) and subarable (20-40 cm)soil layers. Application of potassium sulphate fertilizer caused a significant increase in the content of zinc in herbicide strips in both soil layers compared with potassium chloride and potassium nitrate. Different potassium fertilizer forms did not cause any significant changes in amounts of available forms of iron, manganese, copper and boron. The increase in available potassium levels from 120 to 200 mg K⋅kg-1 of soil d.m significantly reduced the content of manganese in leaves of trees. However, no significant influence on the content of iron, zinc, copper and boron in leaves of apple trees was found.

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The effect of potassium fertilisers on cadmium absorption by plants under conditions of elevated Cd content in soil

58%

Wisniowska-Kielian B.

Acta Agraria et Silvestria. Series Agraria

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2003

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tom 40

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nr Sek.roln.

In pot experiment on very acid soil the effect of form and dose of potassium fertiliser on the cadmium absorption by oats (Avena sativa L.) and maize (Zea mays L.) under conditions of elevated Cd content in soil was investigated. Potassium was applied in two doses as sulphate or chloride against the background of basic NPK treatment. It was found that cadmium uptake and its content in plant tissues was confined or intensified by potassium salts, what dependent on plant species and also K form and dose, probably due to influence on its soluble compounds content in the soil. K2S04intensified Cd accumulation in roots of both species and confined its translocation to aerial parts of maize (Fig 1). effect was greater after higher K dose application. Smaller or opposite effect was observed in case of oats, which showed similar Cd content in shoots when lower K dose in both form was applied, and lower Cd level after higher K dose application in sulphate form (Fig. 2). of Cd absorption from contaminated soil by sulphate may improve fodder quality of plant products.

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Zawartość form potasu w glebie antropogenicznej wytworzonej z gruntów pogórniczych w warunkach zróżnicowanej agrotechniki

51%

Spychalski W., Kosiada T., Otremba K.

Acta Scientiarum Polonorum. Agricultura

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2007

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tom 06

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nr 4

W pracy określono całkowitą zawartość potasu i jego formy w glebie wytworzonej z gruntów pogórniczych, w warunkach zróżnicowanego poziomu nawożenia i dwóch głębokościach orki – płytkiej i głębokiej po dwudziestosiedmioletnim okresie rekultywacji. Całkowita zawartość potasu wahała się od 11630 do 15890 mg K·kg⁻¹ gleby. Zawartość wszystkich w form potasu zwiększała się w glebie wraz ze wzrostem poziomu nawożenia i wahała się w przedziale dla potasu wodno-rozpuszczalnego od 16,45-82,53 mg K·kg⁻¹, potasu aktywnego ekstrahowanego 0,01 mol·dm⁻³ CaCl₂ od 75,51 do 210,93 mg K·kg⁻¹, potasu przyswajalnego oznaczonego w wyciągu Egnera-Riehma od 83,56 do 233,42 mg K·kg⁻¹ gleby, potasu uwstecznionego oznaczonego w 2 mol·dm⁻³ HCl od 177,24 do 403,86 mg K·kg⁻¹, potasu zapasowego ekstrahowanego 1 mol·dm⁻³ HNO₃ od 1001,2 and 1765,0 mg K·kg–1 gleby, potasu rezerwowego ekstrahowanego w 20% HCl od 1801 do 2817 mg K·kg⁻¹. Nie wystąpiły istotne statystycznie różnice pomiędzy tymi sa-mymi kombinacjami nawożenia przy zastosowaniu orki płytkiej i głębokiej.

Ograniczanie wyników

2 Acta Agraria et Silvestria. Series Agraria

1 Acta Scientiarum Polonorum. Agricultura

1 Journal of Elementology

1 Gudarowska E.

1 Hlusek J.

1 Komosa A.

1 Kosiada T.

1 Otremba K.

1 Skarpa P.

1 Spychalski W.

1 Szewczuk A.

1 Wisniowska-Kielian B.

1 2009

1 2007

2 2003

Potassium forms in soil

Effect of different potassium soil levels and forms of potassium fertilizers on micro-elemental nutrition status of apple trees in early fruition period

The effect of potassium fertilisers on cadmium absorption by plants under conditions of elevated Cd content in soil

Zawartość form potasu w glebie antropogenicznej wytworzonej z gruntów pogórniczych w warunkach zróżnicowanej agrotechniki