Abstract
Phytophthora root rot (PRR) caused by Phytophthora megasperma f. sp. glycinea (Pmg) can cause severe yield reductions in soybeans [Glycine max (L.) Merr.]. This study was conducted to determine if management practices (variety selection, metalaxyl [Ridomil] [N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-DL-alanine methyl ester] use, potash fertilization) could reduce PRR impact on soybean production where PRR was known to be a problem. The study was conducted at three experimental field sites in both 1988 and 1989. All sites had a history of damage from PRR. The management treatments were combined in a complete factorial arrangement with four replications. Potassium chloride (0-0-60) was broadcast and incorporated before planting to supply 40, 80, and 160 lb K/acre [...]
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