Fixed NH4-N in relation to EUF-extractable K
1982
Scherer, H.W. (Justus Liebig Univ., Giessen (Germany, F.R.). Inst. of Plant Nutrition)
Representative arable soils from Hesse were investigated for their contents of fixed NH(,4)('+) and EUF-extractable potassium in the rooting zone. Alluvial soils were found to be rich in fixed ammonium and low in EUF-extractable potassium, while soils of basaltic origin were low in fixed ammonium and rich in EUF-extractable potassium. A negative correlation (r=0.79*) was found between fixed NH(,4)('+) and EUF-extractable soil K('+). The content of fixed NH(,4)('+) in the soil profile showed considerable and significant changes during the growing season, which finding is supposed to be due to NH(,4)('+) uptake by the crop.
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