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Summer Defoliation and Autumn‐Winter Production of Phalaris Species and Tall Fescue Varieties 1
Author(s) -
Berry R. F.,
Hoveland C. S.
Publication year - 1969
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1969.00021962006100040002x
Subject(s) - clipping (morphology) , agronomy , biology , forage , winter wheat , grazing , philosophy , linguistics
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.