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Effect of Soil Insecticides on Emergence, Growth, Yield and Chemical Composition of Soybeans¹

Sypnosis: Of ten insecticides studied, only IWC and DDT at high rates caused deleterious effects on soybean emergence. High rates of BHC caused significant reductions in yield. There were no noticeable effects on height, lodging, seed quality, maturity, protein content, or iodine number of the oil. There was very little effect on oil content. Soybeans can be planted safely following crops where soil insecticides have been used, since the dosages used in these tests were much greater than present recommendations for the control of soil insects.

² Research Agronomist, Field Crops Research Branch, A.R.S., U.S.D.A. and Associate Professor, Purdue University; and Associate in Entomology, Purdue University, respectively. The writers wish to acknowledge the cooperation and assistance of F. I. Collins and O. A. Krober, Chemists, of the U. S. Regional Soybean Laboratory, for making all chemical analyses of the seed in this investigation.

Received for publication February 5, 1957.