Abstract
ABSTRACT Except where a good legume sod is plowed under or a heavy application of manure is used, N fertilizer applications are generally necessary for producing high yields from grain crops. A soybean (Glycine max (L.) Merr)-wheat (Triticum aestivum L.) rotation appears to be a logical opportunity to use legume N as a sustainable grain production resource. An experiment conducted to compare N from soybeans with fertilizer N resulted in a 46% reduction in wheat yield following soybeans where wheat was not fertilized with N. Subsequent research showed that when soybeans were allowed to grow to bloom stage or later preceding a wheat or triticale (× Triticosecale Wittmack) crop a significant reduction in grain yield resulted from the previous soybean crop. When the grain crop was fertilized with 80 lbs/acre of N this response did not occur. The experimental results suggest that soybean root exudates are responsible for the decrease in wheat and triticale growth and yield.
Published Version
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