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33.page03 - NRES 201 Intro to Soil Science Lec 33 Potassium...

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Unformatted text preview: NRES 201 Intro to Soil Science Lec. 33 4/9/2009 Potassium and Micronutrients Ch. 13 POTASSIUM K is a common eleruent. the lithosphere contains ~ 2 6 ' Felsic rocks. rich in aluminosilicate minerals (mica. feldspar). contain high amount of potassium (granite, schist. gneiss). Mafic rocks. rich in iron and magnesium minerals, contain 10“ amounts of potassium (gabbro, basalt). POTASSIUM Sedimentary rocks contain Variable amounts of K. Shales ~27 g K/lgg Sandstones ~11 g K/lgg Liruestones ~3 g K/lgg Soils contain [101110.04 to 3 K. the low er amounts 01K in soils reflects the loss 01K during \y eathering and soilfor‘11121tior1. POTASSIUM 1 to 10 I the potassium in soil occurs as fixed cations in the interlayer of Vermiculites and possibly some highly charged smectites. 1 to of the total potassium in soil occurs as K’ ions in the soil solution and 011 the exchange complex. The most important source of potassium in soils are the micaceous minerals and their \y eathering products. ...
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