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Alternatives to Timothy Grown in Mixture with Alfalfa in Eastern Canada
Author(s) -
PomerleauLacasse Florence,
Seguin Philippe,
Tremblay Gaëtan F.,
Bélanger Gilles,
Lajeunesse Julie,
Charbonneau Édith
Publication year - 2019
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/agronj2018.05.0309
Subject(s) - agronomy , perennial plant , forage , lolium perenne , bromus , dry matter , biology , cultivar , festuca arundinacea , hectare , bromus inermis , medicago sativa , poaceae , agriculture , ecology
Core Ideas Mixtures of alfalfa with meadow fescue, tall fescue, or meadow bromegrass have comparable yields and persistence to alfalfa‐timothy. Mixtures with festulolium or perennial ryegrass had lower total seasonal DM yields than the alfalfa‐timothy mixture. Harvesting mixtures at the alfalfa early flower stage maximizes the estimated milk production per ha.Timothy ( Phleum pratense L.) is the main forage grass species cultivated with alfalfa ( Medicago sativa L.) in eastern Canada, yet its regrowth under dry and warm conditions is poor. Air temperature and water stress are predicted to increase in the near future, which could further reduce timothy’s regrowth. We evaluated six alfalfa–grass binary mixtures at three contrasted sites in eastern Canada to find potential alternatives to the alfalfa–timothy mixture under current climatic conditions. Timothy, tall fescue ( Schedonorus arundinaceus [Schreb.] Dumort.), meadow fescue ( Schedonorus pratensis [Huds.] P. Beauv.), festulolium (× Festulolium Asch. & Graebn), perennial ryegrass ( Lolium perenne L.), and meadow bromegrass ( Bromus biebersteinii Roem. & Schult.) were evaluated with harvests either at the early bud or early flower stage of alfalfa. Dry matter yield, nutritive attributes, and the yield contribution of each species were determined. Alfalfa mixtures with festulolium (cv. Spring Green) and perennial ryegrass (cv. Remington) had inferior grass yield contributions due to winter damages, as well as inferior forage yield and estimated milk production per hectare; these cultivars are not currently viable alternatives to timothy in eastern Canada. In contrast, alfalfa–meadow fescue and alfalfa–meadow bromegrass mixtures produced comparable yields, nutritive value, and estimated milk production per hectare and they are, therefore, possible alternatives to the alfalfa‐timothy mixture. The alfalfa–tall fescue mixture also represents a possible alternative; its lower nutritive value was compensated by its slightly greater yield. Timothy, tall fescue, meadow fescue, and meadow bromegrass remained productive over the first three production years when cultivated in mixture with alfalfa.