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Sulfur coated urea vs urea and ammonium nitrate as a nitrogen source for grain sorghum


Sulfur coated urea vs urea and ammonium nitrate as a nitrogen source for grain sorghum



Soil and Crop Science Society of Florida Proceedings 35: 38-42



Sulfur-coated urea (SCU), a slow release N source developed by TVA [Tennessee Valley Authority], was compared with NH4NO3 and urea as N sources for grain sorghum (Sorghum bicolor L. Moench) on Kanapaha fine sand for 3 seasons at Gainesville, Florida [USA]. N rates of 0, 78, 157 and 313 kg/ha were supplied by each carrier, and a 470 kg/ha N rate was tested for SCU only. Part of the treatments received all the N at planting and part received 39 kg/ha of N at planting and the remainder as sidedressing. An unfertilized winter crop of rye (Secale cereale L.) or ryegrass (Lolium multiflorum Lam.) was used to measure residual N each season. No difference was found among the 3 N carriers in production of sorghum grain or silage. Time of application of N to sorghum did not affect yields. The sorghum gave no yield response above 157 kg/ha of N. Rye and ryegrass yields and N content were slightly increased by the 313 and 470 of kg/ha N rate. The 470 kg/ha N rate was toxic to sorghum seedlings. At the end of the 3rd season, the pH and the Ca, Mg and K contents of the top 15 cm of soil were greatly reduced for the treatment receiving 470 kg/ha N from SCU.

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