Planting Date, Cultivar, and Seeding Rate Effects on Soybean Production along the Texas Gulf Coast
Soybean [Glycine max (L.) Merr.] along the upper Gulf Coast region of Texas may be planted from early March through the middle of May. However, soybean yields may vary considerably depending on planting date and cultivar. Field studies were conducted from 2001 through 2003 in Wharton Co. to determine the effect of planting date, soybean cultivar, and seeding rate on yield and pod set. Soybean was planted three times each year at approximately two- to three-week intervals beginning around 10 March. Three cultivars were compared at seeding rates of 145,000 and 220,000 seed/acre. Soybean plant populations varied from year-to-year but generally populations increased with later planting dates. Soybean pod height set varied with the cultivar but was usually taller with the later planting date and higher seeding rate. Below average rainfall was observed during the 2001 growing season while near average rainfall was received during the April to June 2002 growing season. Extremely dry conditions were prevalent during March through June of 2003 with above average rainfall in July of that year. In a near normal rainfall growing season (2002), the later planting date resulted in the highest yield while under drought-stressed conditions, planting date was not an important factor. Overall, soybean planted late-March to mid-April produced higher yields than those planted mid-March. Generally, the higher seeding rate did not improve net returns.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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