Preplant/starter N applications provide no benefit, although residual N, mineralized N and N that comes with P fertilizers are not detrimental to soybean yields. Even N applications for double cropped soybeans -- or soybean after wheat -- have not shown yield benefit. Late season N, or R3 to R5 growth stages, applications do not tend to reliably increase yields. In rare situations, high- yielding irrigated fields can benefit from application of small quantities (less than 60 pounds of N per acre) during early seed filling.
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