Corn Yield Response to Defoliation At Different Row Widths.

Corn (Zea mays, L.) hybrids exhibit different yield responses to defoliation timing and rates. There is limited data on the effect of row width on defoliation. The objective of this experiment was to determine the effect of corn defoliation in 38 and 76 cm rows. Two corn hybrids, P1360HR (113 CRM) and P2088HR (120 CRM) were seeded April 26, 2012 at Lexington, Kentucky (38°01′47″N, 84°29′41″O). Treatments for this experiment include: control (no defoliation) and defoliation events at V7 (100% rate), V14 (50 and 100% rates) and at R2-R3 (50 and 100% rates). Light interception was monitored to quantify plant recovery and grain yield will be measured.