Delayed Planting
Figure 1. Relative yield by planting date in the Midwest (Egli and Cornelius, 2009).
Early Planting for Higher Yield
Figure 2. Soybean yield by planting date from High Yield Soybean Challenge entries in Nebraska and Kansas from 2013-2016 (Propheter and Jeschke, 2017).
Figure 3. Average plot location yield by planting date from 455 on-farm soybean research locations in Iowa, Illinois, and Indiana in 2017.
Table 1. Average soybean yield with early and normal planting dates in Northern and Central Illinois trials conducted from 2012 to 2014 (Nafziger and Vossenkemper, 2015).
Daylength Interactions
Figure 4. Dates of R1 and R6 growth stages for soybeans planted in mid-April and mid-May near Pittsburg, PA (40.4º N) from Parker et al. (2016).
Yield Implications
Author: Ryan Van Roekel, Ph.D.
January 2019
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. Product performance is variable and depends on many factors such as moisture and heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. Individual results may vary.