James Adkins, Extension Engineer, adkins@udel.edu
Corn should be at black layer for everything but extremely late-planted long-season varieties. UD research has not been able to identify any yield or test weight advantage to irrigation after black layer.
Soybeans are currently using 0.17” per day for both full and double-crop soybeans. Keep applying irrigation through leaf yellowing into leaf drop. Data shows up to 1.6 inches of beneficial water use after the leaves have yellowed. Late-season water availability is critical to bean size and test weight.