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Recycling and Recovery of Nitrogen, Phosphorus, and Potassium by Coastal Bermudagrass: I. Effect of Sources and Rates of Nitrogen Under a Clipping System¹

ABSTRACT

A field experiment was conducted to determine recovery efficiencies for applied N, P, and K under a system of total removal of forage (Cynodon dactylon L. Pers. ‘Coastal’) over a 3-year period. Ammonium nitrate, (NH₂)₂CO, and (NH₄)₂SO₄ were each applied in split applications of 0, 280, 560, and 840 kg N/ha each season. Soil levels of total N, chemically extractable P, and K were monitored each season. Results show that N recovery percentages ranged in the following order: (NH₄)₂SO₄>NH₄NO₃ > (NH₂)₂CO. Characteristic decreases in recoveries occurred with increasing N rates. Source effects on recovery efficiencies for P were as follows: NH₄NO₃ (NH₄)₂SO₄ > (NH₂)₂CO. Average P recovery percentages for NH₄NO₃ were 34, 46, and 52% for rates of 280, 560, and 840 kg N/ha, respectively. Plant recovery of applied K was greatest for (NH₄)₂SO₄ and lowest for (NH₂)₂CO. Average values for (NH₄)₂SO₄ were 108, 165, and 222% for the low, medium, and high rates of N, respectively. Ammonium sulfate gave greater accumulation of soil N with time than NH₄NO₃ or (NH₂)₂CO while chemically extractable soil P and K were highest for NH₄NO₃.

Key Words: nutrient recovery

¹ Contribution from Texas A&M University Agricultural Research and Extension Center, Overton.

² Respectively, Assistant Professors, Texas A&M Univ. Agr. Res. & Ext. Center at Overton, 75684; and Assistant Professor, Soil & Crop Sciences, Texas A&M Univ., College Station. 77843.

Received for publication May 1, 1972.

This article has been cited by other articles:

				M. L. Silveira, V. A. Haby, and A. T. Leonard Response of Coastal Bermudagrass Yield and Nutrient Uptake Efficiency to Nitrogen Sources Agron. J., April 4, 2007; 99(3): 707 - 714. [Abstract] [Full Text] [PDF]