Continuation of cropping sequence studies on coarse textured soils in southeastern Idaho

A potato cropping rotation study was initiated on coarse textured soils in 1969 to compare annual cropping to potatoes with potato-grain rotations. At the completion of the 1975 season, those treatments annually cropped to potatoes had been planted to potatoes for seven consecutive years. After this period of time, total yields were reduced by 14% or 55 cwt/acre (6 T/ha) when compared to yields from potato-grain rotation treatments. Soil fumigation with 30 gpa (285 1/ha) of soil fumigant (Shell D-D) resulted in no beneficial effects on tuber yield or quality.