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This article in AJ

  1. Vol. 70 No. 3, p. 497-500
     
    Received: Oct 7, 1977


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doi:10.2134/agronj1978.00021962007000030033x

Forage Yield and Quality of Phalaris as Affected by N Fertilization and Defoliation Regimes1

  1. Joao C. Saibro,
  2. Carl S. Hoveland and
  3. John C. Williams2

Abstract

Abstract

Phalaris (Phalaris aquatica L., also referred to as P. tuberosa L.) is a winter productive cool-season perennial grass species having potential in the southeastern U.S. The purpose of our study was to determine the effect of N fertilization rates and defoliation on forage yield, in vitro dry matter digestibility (IVDMD), total forage N and NO3-N, and total non-structural carbohydrates (TNC) stored in conns. The synthetic, ‘AP-2’ phalaris, was fertilized at 100, 200, 300, and 400 kg N/ha/year and harvested at vegetative, inflorescence emergence, and seed stages of growth over a 2-year period in the field.

Forage yield, total N, and NO3-N concentration increased linearly with increasing N fertilization. Maximum dry forage yield was 10 metric tons/ha annually. Total N concentration ranged from 2.8 to 4.0%. Forage NO3-N concentration was highest in autumn but less than that considered potentially toxic to ruminants. Harvesting at more advanced plant maturity increased forage yield while reducing NO3-N and IVDMD. The IVDMD was relatively high, averaging 63% over the year. Corm reserves of TNC decreased with N fertilization but increased with plant maturity. TNC in corras remained low throughout the active growing season. Results of this study indicate that AP-2 phalaris can utilize up to 300 kg N/ha annually either under frequent defoliation or cutting at hay stage. This grass maintains relatively high IVDMD at a fairly advanced stage of maturity.

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