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COMPETITION

Growth Analysis of Faba Bean and Lupin with Volunteer Barley Competition in a Northern Environment

^a Dep. of Agric., Food, and Nutritional Sci., 4-10 Agriculture-Forestry Cent., Univ. of Alberta, Edmonton, AB, Canada T6G 2P5
^b Alberta Agric. and Food, Agric. Res. Division, 2nd floor, 6203-49 Street, Box 4560, Barrhead, AB, Canada T7N 1A4

^* Corresponding author (shaneandsheri{at}xplornet.com).

Volunteer barley competition can significantly decrease the productivity of tannin-free faba bean (Vicia faba L.) and narrow-leafed lupin (Lupinus angustifolius L.). Field experiments were conducted in north central Alberta, Canada, between 2004 and 2006 to establish the effects of volunteer barley competition on these two crops. Faba bean and lupin were grown with three densities (0, 25, and 50 plants m^–2) of volunteer barley (Hordeum vulgare L.). Leaf area index (LAI), light interception, canopy height, and aboveground dry matter (DM) accumulation were measured at 21-d intervals between 37 and 120 d after planting (DAP). At 79 DAP, 25 barley plants m^–2 reduced faba bean LAI by 41% and lupin LAI by 64% compared with treatments without volunteer barley. Volunteer barley was shorter than the faba bean canopy but taller than the lupin canopy. As a result, volunteer barley did not affect the amount of light available at the top of the faba bean canopy. Due to the height advantage of volunteer barley over lupin, the amount of light available at the top of the lupin canopy was reduced to 51%, 100 DAP. A volunteer barley density of 25 plants m^–2 reduced lupin DM by 68% and faba bean DM by 38%. The poor competitive ability of lupin may be attributed to slow early season LAI development, short stature, and poor light interception, which indicate the need for early and effective volunteer barley control in lupin crops.

Abbreviations: DAP, days after planting • DM, dry matter • LAI, leaf area index • PAR, photosynthetically active radiation

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Received for publication October 23, 2007.