Objective 2 Crop Competitive Ability And Disease Resistance

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Objective 2a: Crop competitive ability and disease resistance: Assess varietal differences in competitive ability against weeds and resistance against major diseases for oat, winter wheat and spring wheat. a.) Quantify weed suppressive ability under organic field conditions; b.) Quantify crop tolerance of weed pressure in field conditions; c.) Determine which crop characteristics (emergence timing, leaf blade width, tillering, leaf area index, height, growth rate) are most highly correlated with crop weed suppressive ability and weed tolerance (Drs. Carr, Gramig, Menalled, and Sexton); d.) Evaluate two biological control agents (Ballad Plus and Kodiak Concentrate OMRI-approved chemicals) to control crown rust of oat and tan spot and FHB …show more content…

Crop varieties/advanced lines will be planted at seeding densities and row spacing typical for organic small grain production in the NGP. Within each plot shortly after crop emergence, three 1 x 1 m subplots will be established that contain 1) Crop only 2) Weeds only and 3) Crops + Weeds. Emergence timing of crops and weeds will be noted. At critical crop growth stages (tillering, flag leaf, and physiological maturity) crop plants will be evaluated for height, leaf blade width, and tiller number. At physiological maturity, crown projection biomass of crops and weeds will be sampled. Using a ceptometer, leaf area index will be assessed at these critical crop stages in weed-free subplots. At physiological crop maturity of the crop, the subplots will be harvested. Crop and weed plants will be separated by species and counted, then dried to determine plant biomass and crop yield. By comparing weed biomass and density between Weed-only and Crop + Weed plots, crop weed suppressive ability will be quantified. By comparing crop yield between the Crop only and Crop + Weed plots, crop tolerance to weeds will be quantified. These experiments will be conducted during years 2 and 3 (2019 and 2020) of this project.

Data analysis: For each variety and location, we will calculate variety competitiveness as: Competitiveness = 100 - percentage

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