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Nitrogen Sources for Hay Production on Flooded Meadows¹

ABSTRACT

Three experiments were conducted over a 3-year period to compare various urea materials and ammonium nitrate as N sources for hay production on flooded meadow sites. Each experiment was a complete factorial combination of fertilizer N sources and rates broadcast once in the spring on established forage prior to flood irrigation. Experiment 1 in Gunnison County consisted of ammonium nitrate (AN), urea (U), sulfur-coated urea (SCU), and urea ammonium polyphosphate (UAPP) broadcast at rates of 0, 67, 134, 202, and 269 kg N/ha. A second season's data was collected to evaluate carryover N. Experiments 2 and 3 were conducted in Jackson County for a single season and consisted of AN, U, UAPP, and urea ammonium sulfate (UAS) broadcast at 0, 90, 179, and 269 kg N/ha.

Hay yields and N uptake were significantly increased by N fertilizer at each location; there was no significant response in hay yield or N uptake resulting from residual N in the second season of Experiment 1. Source of N did not influence hay yields nor N uptake. The N content of the hay was significantly influenced by the N fertilizer rate at two locations and the N source at one location. In general, hay yields and N uptake increased with increasing rates of fertilizer N. Fertilizer efficiency was low at all locations, ranging between 8.5 and 19.6 kg hay/kg N. Fertilizer N recovery was <30% for all treatments. Both efficiency and recovery of N tended to decrease with increasing N rates.

¹ Contribution from the Colorado State Univ. Exp. Stn. and published as Scientific Series Pap. no. 2292. Supported in part by the Test and Demonstration Branch, TVA, Muscle Shoals, AL 35660.

² Associate Professors of Agronomy, (second author is currently Agronomist, U. S. Dep. of Agric., Coop. State Res. Serv., Washington, DC. 20250) Colo. State Univ. First author located at Ft. Collins, CO 80523; remaining authors at CSU Mountain Meadow Res. Center, Gunnison, CO 81230.

Received for publication September 15, 1977. Accepted for publication February 6, 1978.

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