MIDLAND 99 BERMUDAGRASS FORAGE YIELD RESPONSE TO TWO YEARS OF PHOSPHORUS AND POTASSIUM FERTILIZATION
University of Arkansas Cooperative Extension Service
Warm-season forage makes up the largest percentage of hay harvested in Arkansas. Median soil test P(phosphorus) and K(potassium) for warm-season forages has declined since 2006, suggesting the lack of fertilizing forages sufficiently with K. This report summarizes P and K research conducted in 2011-12 on an established stand of Midland 99 bermudagrass on a farm located in El Paso, Arkansas having suboptimal soil P and K availability. Our research objective was to evaluate soil test P and K and bermudagrass yield and nutrient uptake as affected by annual P and K fertilization. Soil samples were collected from each plot to monitor soil-test P and K. In the K rate trial, muriate of potash was applied in two or three applications of 0, 90, 180, 270, 360, and 450lbs. K2O/acre. In the P rate trial, triple superphosphate was applied in one to three applications of 0, 30, 60, 90, 120, and 150lbs. P2O5/acre. The biomass was harvested from each plot and weighed. It was adjusted to a total dry weight of forage/acre. Soil test P and K were increased with the treatments. Year one yields from the first two and the fourth harvest events were unaffected by K fertilization. Phosphorus fertilization resulted in similar yield results. Forage receiving no P produced the lowest yield at three of the four individual harvests, but the differences were never significant. Year 2 yield was increased in treatments of P and K versus the unfertilized control. The stand appeared to be more uniform.
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Authors: B.W. Haller, N.A. Slaton, C.G. Massey, R.E. DeLong, B. Gordon
Haller, B. County Extension Agent - Staff Chair, University of Arkansas Cooperative Extension Service, Arkansas, 72143
Slaton, N. Professor, University of Arkansas, Division of Agriculture, Arkansas, 72704
Massey, C. County Extension Agent - Agriculture, University of Arkansas, Cooperative Extension Service, Arkansas, 72704
DeLong, R. Research Associate, University of Arkansas, Division of Agriculture, Arkansas, 72704
Gordon, B. County Extension Agent - Agriculture, University of Arkansas, Cooperative Extension Service, Arkansas, 72143