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This article in JEQ

  1. Vol. 31 No. 5, p. 1731-1738
     
    Received: June 18, 2001
    Published: Sept, 2002


    * Corresponding author(s): dvietor@tamu.edu
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doi:10.2134/jeq2002.1731

Export of Manure Phosphorus and Nitrogen in Turfgrass Sod

  1. D. M. Vietor *a,
  2. E. N. Griffitha,
  3. R. H. Whitea,
  4. T. L. Provina,
  5. J. P. Muirb and
  6. J. C. Readc
  1. a Soil and Crop Sciences Dep., Texas A&M University, College Station, TX 77843-2474
    b Texas A&M University Research and Extension Center, Stephenville, TX 76401
    c Texas A&M University Research and Extension Center, Dallas, TX 75252-6599

Abstract

Regulatory mandates have increased demand for best management practices (BMPs) that will reduce nutrient loading on watersheds impaired by excess manure P and N. Export of manure P and N in turfgrass sod harvests is one BMP under consideration. This study quantified amounts and percentages of P and N removed in a sod harvest for different rates of manure and inorganic P and N. Six treatments comprised an unfertilized control, two manure rates with and without supplemental inorganic N, and inorganic P and N only. The treatments were applied to ‘Tifway’ bermudagrass (Cynodon dactylon L. × C. transvaalensis Burtt-Davey), ‘609’ buffalograss [Buchloe dactyloides (Nutt.) Engelm.], and ‘Reveille’ bluegrass (Poa arachnifera Torr. × P. pratensis L.) under field conditions. Comparisons among treatments revealed small variations of P and N content in clippings and the plant component of sod, but large variations in the soil component of sod for each turf species. In addition, 2 to 10 times more P and 1.3 to 5 times more N was removed in soil than in plant components of sod for the two manure rates with and without added inorganic N. Percentages of applied P and N in harvested sod were similar for the two manure rates with and without added N for each species, but differed among turf species for each P (46 to 77%) and N (36 to 47%). The large amounts and percentages of manure P and N removed by sod harvest support the feasibility of this BMP in efforts to reduce nutrient loads on watersheds.

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Copyright © 2002. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.31:1731–1738.