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Urea ammonium sulfate and urea ammonium phosphate evaluation as nitrogen sources in the southeast usa



Urea ammonium sulfate and urea ammonium phosphate evaluation as nitrogen sources in the southeast usa



Soil Science Society of America Journal 43(3): 606-610



Recent increases in N fertilizer cost emphasize the need for information concerning the use of cheaper N sources to produce the most marketable yield per unit fertilizer cost. Urea-NH4 sulfate (UAS) and urea-NH4 P (UAP) are 2 new fertilizer products in which urea is the main source of N. These materials were compared to NH4 NO3 (AN) as N sources for corn (Zea mays L., Coastal bermuda grass (Cynodon dactylon L. Pers.) and rye (Secale cereale L.). Each material was used to supply N at rates from 0 up to 448, 336 and 135 kg/ha on coastal bermuda grass, corn and rye, respectively. All crops were grown on Tifton soil (Plinthitic Paleudult; fine, loamy, siliceous, thermic). Corn was also grown on a Greenville soil (Rhodic Paleudult; clayey, kaolinitic, thermic). Recommended cultural practices normally used in the area were followed for each crop. Forage yield for coastal bermuda grass and rye was measured and selected samples analyzed for ammoniacal N concentration. Corn grain yield was measured. Selected soil samples from the corn experiment were analyzed for NO3 N. Percent N increased in coastal bermuda grass and rye forage as N application rate increased. Coastal bermuda grass recovered less N from both UAP and UAS than from AN at the 336 kg/ha N rate. All materials were equivalent as N sources for rye and corn. Irrigation of the corn increased yields as well as nitrate-N leaching. Applying 50% of the 336 kg/ha N at planting and the rest later to prevent leaching in corn production was no better on Tifton and Greenville soils than a single preplant N application of either 168 or 336 kg/ha. For Southeastern Coastal Plain [USA] conditions the 2 fertilizers evaluated could replace AN in corn and rye production without loss in N concentration, yield or N use efficiency. The materials tended to be less efficient than AN in supplying N for Coastal bermuda grass production.

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