Prine , G.M. (1976) Sulfur-coated urea versus urea and ammonium nitrate as a nitrogen source for grain sorghum. Proceedings - Soil and Crop Science Society of Florida, 35. pp. 38-42.
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Abstract
In field trials on Kanapaha fine sand at Gainesville, Florida in 1970-2, grain sorghum cv. Bird-Go and BR-64 was given 78, 157 or 313 kg N/ha as sulphur-coated urea (SCU), ammonium nitrate or urea or 470 kg N/ha as SCU. An unfertilized winter crop of rye or ryegrass was used to measure residual N each season. Sorghum grain and silage yields were not significantly affected by either N source or date of application of N (all at sowing or part at sowing and part as side-dressing); average annual grain yield for all application rates and dates was 4.31 t/ha for ammonium nitrate, 4.38 t for SCU and 4.44 t for urea. Increasing the N rate above 157 kg/ha did not significantly increase yields and the 470 kg N/ha rate was toxic to seedlings. SCU furnished more residual N to winter rye and ryegrass than did the other sources at high N rates but this seemed to be of little practical value at normal rates of applied N. Drastic reductions were noted in the pH and the Ca, Mg and K contents of the soil at the end of the 3-year period for the 470 kg N/ha rate of SCU
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Agronomy, Florida University, Gainesville, FL 32611, USA |
| Subjects: | Plant Production |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 04 Sep 2012 10:15 |
| Last Modified: | 04 Sep 2012 10:16 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7706 |
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