55-11 Field-Scale Studies Show Significant Location X Seeding Depth Interactions for Corn and Soybean Populations and Yields.
Corn plant populations and grain yields had strong year x location x seeding depth interactions. Although yield differences among seeding depths were generally small, increasing the depth from 2.0 to 2.5 inches at the silty clay site decreased yield ~6%. In contrast, decreasing the depth from 2.5 to 2.0 inches at the clay loam site decreased yield ~9%. The significant year x location x seeding depth interaction for yield indicates that corn growers in NY should adjust seeding depth to soil conditions, although predicting ensuing soil conditions after planting is difficult.
Seeding depths >1.5 inch decreased soybean plant populations at two sites by ~10%. Yield did not respond to seeding depth in 3 site/years and showed quadratic responses in 3 site/years. Yield differences, however, were small at responsive sites with ~5 % difference at the no-tilled site, and ~7.0% at the gravelly loam site. The 1.5 inch seeding depth generally resulted in excellent early stand establishment (>85% emergence for all site/years except for 77% at the gravelly loam site in 2013) and maximum yield in two of the three site/years where yields responded to seeing depth.