Details

Autor(en) / Beteiligte

• Mengel, K
• Scherer, H.W

Titel

Release of nonexchangeable (fixed) soil ammonium [by clay minerals] under field conditions during the growing season

Ist Teil von

• Soil science, 1981, Vol.131 (4), p.226-232

Ort / Verlag

Baltimore: Baltimore :Lippincott Williams & Wilkins Co

Erscheinungsjahr

1981

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The authors studied the release of fixed (nonexchangeable) NH sub(4) super(+) by clay minerals under field conditions on two representative arable sites, one on loess the other on alluvial soil. The nonexchangeable NH sub(4) super(+) content of soil from three depths was determined at five dates during the growing season in fields carrying winter barley (loess) or spring oats (alluvial soil). There were significant changes in the content of nonexchangeable NH sub(4) super(+) during the growing period. Early in crop growth particularly, the upper soil layers (0 to 60 cm) were depleted of nonexchangeable NH sub(4) super(+); later, nonexchangeable NH sub(4) super(+) declined at the depth of 60 to 90 cm. The nonexchangeable NH sub(4) super(+) content of alluvial soil recovered to approximately its original level at the end of the growing season. There was a substantial net loss on nonexchangeable NH sub(4) super(+) from the loess soil of about 40 ppm, equivalent to 500 kg N/ha assuming a soil depth of 90 cm.