Potato early dying and yield responses to tillage treatments in Eastern Canada


Chen, D., J. Nyiraneza, K. Nahar, D. Murnaghan, J. Matheson. 2022. Potato early dying and yield responses to tillage treatments in Eastern Canada. The Canadian Society for Horticultural Science’s national 2022 conference Lord Nelson Hotel and Suites, 1515 South Park street, Halifax, NS 2022/08/18 - 2022/08/20


Residue tillage (RT) has shown potentials in improving soil health, suppressing soil-borne diseases, and enhancing crop productivity in various cropping systems. Mouldboard plowing (MP) in fall is a conventional practice in eastern Canada, which leaves the soil prone to erosion and nitrate leaching. Potato early dying (PED), caused by root lesion nematodes (RLN, Pratylenchus spp.) and Verticillium dahliae, and declining soil organic matter have been identified to be the major yield limiting factors in Canada. A study in the Atlantic Living Laboratory project was conducted in commercial fields in Prince Edward Island to evaluate the influence of RT on PED and potato yield in comparison with MP. A split field approach, where one half of the field uses MP and the other half of the field uses RT, was employed to each field with four replicates from 2019 to 2021. Composite soil samples were collected from each replicate before potato planting and after potato harvesting for quantification of RLN and V. dahliae. The PED severity and tuber yields were determined between the treatments. Preliminary results showed that RT had no effect on RLN population density either in spring or in fall. The effect of RT on V. dahliae population density was field-specific and the average density across the fields over the years with RT was significantly higher than that of the MP. PED severity and yield response to tillage will be presented.