Corn Planting Date and Plant Population

Abstract

Predictions of yield responses to planting date and plant population in corn (Zea mays L.) are necessary in order to match plant population to a particular planting date, and also to make replant decisions. Much of the published research on these factors is relatively old. This study was conducted at Monmouth and DeKalb, Illinois for 4 yr (1987-1990) in order to formulate a predicted response of two modern hybrids to planting date and plant population. The two hybrids in the study showed no consistently different yield response to planting date, to plant population, or to the interaction of these two factors. Generally, yields increased from mid-April to late April planting dates, then declined as planting was delayed to late May [...]