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| Author(s): | Osborne, G. J. |
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| Author Affiliation: | Agricultural Research Institute, Wagga Wagga, New South Wales 2650, Australia |
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| Title: | The significance of intercalary ammonium in representative surface and subsoils from southern New South Wales |
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| Source: | Australian Journal of Soil Research. Vol. 14, No. 3, 1976, p. 381-388. |
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| Keywords: | TIC Keywords: Nitrogen fertilizers; Ammonium fertilizers; Ammonium fixation; Soil types
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| Geographic Terms: | Australia, New South Wales |
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| Abstract/Contents: | Six surface and subsoils known to contain native intercalary ammonium were examined to assess the importance of ammonium fixation when nitrogen fertilizers were applied, the availability of native and recently fixed intercalary ammonium to plants, and the effect of potassium on fixation. Only one soil, a grey soil of heavy texture (Ug 5.4), fixed significant amounts of added ammonium sulphate, the level of intercalary ammonium being increased by 55% in the surface and 100% in the subsoil. The native level of intercalary ammonium was reduced by 8 and 17% by the growth of Lolium perenne in the red-brown earth (Dr 2.23) and the grey soil, respectively, but was unchanged in the other soils. The addition of small amounts of potassium prior to the ammonium did not affect fixation; however, additions of 500 ppm reduced the fixation of a 200 ppm solution of ammonium by 80%. Intercalary ammonium is not considered to be important in the nitrogen economy of five of the six major farming soils of the slopes and plains area of southern New South Wales. The sixth, the grey soil of heavy texture, is an alluvium associated with the Murrumbidgee River and its tributaries, and is used extensively for irrigated agriculture. Because this soil can fix large amounts of ammonium, the use of ammonium or ammonium-forming fertilizers is not recommended. |
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| Language: | English |
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| References: | 18 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Osborne, G. J. 1976. The significance of intercalary ammonium in representative surface and subsoils from southern New South Wales. Australian Journal of Soil Research. 14(3):p. 381-388. |
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