Yield response of soybean to
planting date from1986 to 2002 (17 years), SE South
Dakota Experiment Farm, Beresford, SD. Relative Maturity (rating) - - - - -
- - - - Average planting date - - - - - - - - - Daily
yield loss: May 5 May 15 May 25 June 4 June 14 May 25 to
June 14 - - - - -
- - bu/acre, 13% moisture - - - - - - - - Early (1.5 to 2.2) 44 43 43 41 35 0.4 Medium (2.3 to 2.7) 43 43 42 39 35 0.4 Discussion:
Significant yield reductions occur in the early and medium maturity varieties
when
planted on June14 and June 4, respectively. In both varieties, the daily
loss was 0.4 bushels per acre
from May 25 to June 14, regardless of maturity rating. Discussion by R.G.
Hall, Ext.
Agronomist-Crops, Plant Science Dept., South Dakota State University,
Brookings, SD. Source: Berg,
R., M. Draper, R. Stevens, B. Jurgensen, R. Stevens, G. Williamson, A.
Wiebesiek, K.
Ruden and S. Schilling. 2001. Date of planting soybean with fungicide seed
treatments. SE South Dakota
Experiment, Farm Progress Report 42:28-35.