Analyzing Competition Between a Living Mulch and a Vegetable Crop in an Interplanting System

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Abstract
Development of interplanting systems for vegetables has been impeded due to concerns about yield reductions and use of systematic experimental designs that limit analysis of fundamental competitive processes. This study employed an addition series and growth analysis combined with management strategies aimed at minimizing competition between the crop and the interplant. Pak choi [Brassica rapa L. (Chinensis Group)] was interplanted with strips of ryegrass (Lolium perenne L.) that covered 67% of the soil. Pak Choi was a weak competitor compared to perennial ryegrass. Mulch suppression using a sublethal rate of fluazifop provided the most promising management strategy to reduce competition from the ryegrass interplant. Timing of suppression and reduction of mulch root growth were critical elements of successful management. Chemical names used: (±)-2-[4-[[5-(trifluoromethyl)-2-pyrindinyI]oxy]phenoxy]propanoic acid (fluazifop).

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