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Abstract
Oxamide, a slow‐release N source, may have anti‐ethylene growth regulator effects as well as nutritional effects on plants. Responses of wheat (Triticum aestivum L.) to foliar application of oxamide and other N sources, of soybean (Glycine max L. Merr.) to foliar and soil applications of oxamide, and of both species to oxamide in hydroponics solution were measured to assess growth regulator and nutritional effects. Wheat studies were at two locations for two years and soybean studies were at one location for one year. Foliar applications of oxamide to wheat increased grain protein concentration in three of four tests but were less effective than urea foliar applications. Oxamide supplied as foliar or soil treatment to soybean increased the test weight but had little other discernable effect. In hydroponics culture, oxamide was inferior to nitrate as an N source. We concluded that oxamide did not function as a growth regulator and that plant responses were determined by solubility, degradability, and penetrability of the compound.
Notes
Contribution no. 88–131‐J, Kansas Agr. Exp. Sta., Manhattan, Kansas 66506. Financial support of this research by Estech, Inc. is appreciated.