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15 April 2018 Exploring agronomic strategies to improve oat productivity and control weeds: leaf type, row spacing, and planting density
Pufang Li, Fei Mo, Defeng Li, Bao-Luo Ma, Weikai Yan, Youcai Xiong
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Abstract

The trade-off between crop production and weed control is a fundamental scientific issue, as it is frequently influenced by individual crop competitive ability, population density, and planting pattern. A 2 yr field study was conducted to examine the relationship between planting density and row spacing, using two contrasting oat varieties. On average, high planting density (480 plants m-2) reduced weed biomass at oat maturity by 59% in 2012 and by 56% in 2013, when compared with a low density (120 plants m-2). The droopy-leaf variety suppressed weed biomass by up to 69% and weed density up to 72%, compared with the erect-leaf variety. In a drier year, the greatest grain yield was achieved with the droopy-leaf variety under the intermediate density, while in 2013, the erect-leaf variety under the high density had similar yield to the droopy-leaf variety at the intermediate density. A general trend was that increasing plant density suppressed weed infestation, and promoted crop biomass and yield. The droopy-leaf variety exhibited a strong competitive ability under the intermediate planting density, while the erect-leaf variety had a strong competitive ability under the high density. Taken together, there was a complex variety-by-environment interaction to achieve the balance between crop production and weed suppression, which was mediated by growing-season conditions.

© Her Majesty the Queen in Right of Canada 2018. Permission for reuse (free in most cases) can be obtained from Rightslink.
Pufang Li, Fei Mo, Defeng Li, Bao-Luo Ma, Weikai Yan, and Youcai Xiong "Exploring agronomic strategies to improve oat productivity and control weeds: leaf type, row spacing, and planting density," Canadian Journal of Plant Science 98(5), 1084-1093, (15 April 2018). https://doi.org/10.1139/cjps-2017-0354
Received: 21 November 2017; Accepted: 2 April 2018; Published: 15 April 2018
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