Myers, R.J.K. (1978) Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 3. Effect of nitrogen carrier, time and placement. Australian Journal of Experimental Agriculture and Animal Husbandry, 18 (95). pp. 834-843.
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Abstract
Different N carriers and placements and strategies of application to rain-fed grain sorghum growing in a clay loam soil were compared in field experiments at Katherine, Northern Territory. The N carriers were ammonium sulphate, ammonium nitrate, urea and anhydrous ammonia; placements were banding, mixing into the topsoil, and broadcasting; and strategies consisted of split application, and varying time of broadcasting. The rate used throughout was 50 kg N/ha. Responses to the various treatments varied between the 2 seasons (1970-71, 1971-72) due to differing soil moisture conditions. There was a response to broadcasting N after emergence, giving higher grain yield and N yield than earlier broadcasting or application with the seed. Banded N (both seasons) and split N (one season) were superior to other methods of applying N with the seed. The only yield differences between sources of N were with broadcast application, where ammonium sulphate proved superior in 1 season and with respect to apparent recovery of N by the crop, when the order ammonium nitrate > ammonium sulphate > urea was observed in both seasons. It is suggested that in this environment and on this soil, N is not particularly susceptible to volatization, and broadcasting urea and ammonium fertilizer onto dry soil may retain N within the rooting zone, in comparison with nitrate, which is more susceptible to leaching. Incorporated fertilizer is more susceptible to nitrification and subsequent leaching, while banded N appears to resist nitrification and leaching
| Item Type: | Article |
|---|---|
| Author Affiliation: | Division of Tropical Crops and Pastures, CSIRO, St.Lucia, Qld., Australia 4067 |
| Subjects: | Plant Production Soil Science and Microbiology Soil Science and Microbiology > Soil Sciences |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 29 Jan 2013 08:43 |
| Last Modified: | 29 Jan 2013 08:43 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/9434 |
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