EFFECTS OF NITROGEN SOURCES AND RATES ON DRY MATTER YIELD OF HYBRID BERMUDAGRASS
Applied Research
Daniel Griffin
CEA-STAFF CHAIR
University of Arkansas
CLINTON
Abstract
The effectiveness of different nitrogen fertilizer sources for summer forage production is often discussed. There is debate whether urea nitrogen is less effective than ammonium nitrate for bermudagrass production. Most research shows either no or small differences in forage yield between these sources, yet the belief persists that much of the N in urea will be lost during hot summer weather. Further, new additives are available that reduce N volatilization losses from urea potentially improving its effectiveness for summer forage production. This study was initiated to compare the forage yield response of hybrid bermudagrass to ammonium nitrate, urea, urea with two N loss preventative additives, and urea ammonium nitrate (UAN 32%) applied at three N rates. Treatments were arranged as a randomized complete block design with four replications. The plots were harvested 4 times and clipped to a height of approximately 3 inches. Nitrogen sources were not significantly different for dry matter yield. Nitrogen rate did significantly influence yield with dry matter increasing with increasing N rate. The biggest DM increase per unit of N was from the 30 lb N per acre rate followed by the 60 lb N rate. It should be noted that each nitrogen application received rainfall within 5 days after nitrogen application.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted only for display at AM/PIC. Poster is not to be judged, but the abstract will be published in the proceedings.
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Authors: Daniel Griffin
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Griffin, D. CEA-STAFF CHAIR, University of Arkansas Division of Agriculture Cooperative Extension Service, Arkansas, 72031