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This article in AJ

  1. Vol. 61 No. 4, p. 493-497
     
    Received: Nov 4, 1968
    Published: July, 1969


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doi:10.2134/agronj1969.00021962006100040002x

Summer Defoliation and Autumn-Winter Production of Phalaris Species and Tall Fescue Varieties1

  1. R. F. Berry and
  2. C. S. Hoveland2

Abstract

Abstract

The effect of summer defoliation on autumn-winter (October—February) growth of koleagrass, hardinggrass, ‘Ky 31’ and ‘Goar’ tall fescue was studied for two years. Clipping in June and July reduced the autumn-winter forage yield of harding 55% and kolea 47% as compared with that of plots unclipped from May to September. Percent total available carbohydrates (TAC) in July was positively correlated with autumn-winter production of both Phalaris species. Kolea was more summer dormant than harding.

Clipping in mid-July reduced autumn-winter growth of Ky 31 but had no effect on Goar tall fescue. Clipping in early June sharply reduced autumn-winter production of Goar but did not affect Ky 31. Summer clipping reduced the percent TAC in early September for Goar and TAC was correlated with autumn-winter growth. TAC and autumn-winter growth of Ky 31 were not correlated.

Summer resting of these Phalaris species and tall fescue varieties appears necessary for maximum autumn-winter production in the lower southeastern United States.

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