Individual study: Effects of moldboard plowing, chisel plowing and rotation crops on the rhizoctonia disease of white potato
Leach S.S., Porter G.A., Rourke R.V. & Clapham W.M. (1993) Effects of moldboard plowing, chisel plowing and rotation crops on the rhizoctonia disease of white potato. American Potato Journal, 70, 329-337
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Use crop rotation in potato farming systems
A study in 1987-1990 in arable land in Presque Isle, Maine, USA (Leach et al. 1993) found that under moldboard ploughing, incidence of Rhizoctonia solani disease in potatoes Solanum tuberosum was 91% higher than average in rotation with oats Avena sativa, but did not vary with four other rotation crops: buckwheat Fagopyrum esculentum, lupins Lupinus albus, peas Pisum sativum and broccoli Brassica oleracea. Under chisel ploughing, R. solani was 83% lower than average in rotation with broccoli but was not affected by rotation with oats, buckwheat, lupin or peas. No differences between rotation crops were observed until the fourth year of the study. Rotation crop showed no effect on R. solani soil populations. The five rotation crops were planted in two year rotations with Russet Burbank potatoes. Rotation plots were 8.6 x 20.1 m, with 4.3 x 20.1 m subplots under each ploughing treatment. All rotation crops were harvested except buckwheat, which was ploughed in as a green manure. Ten weeks after planting, 10 plants from each potato plot were scored for R. solani incidence and twenty-five 20 cm deep soil samples were taken to assess soil populations.