Maturity Group III Soybean Varieties' Yield Response in North Mississippi.

A.R. Taylor, N.W. Buehring and M.P. Harrison

Maturity Group III Soybean Varieties’ Yield Response in North Mississippi

Mississippi State University, North Mississippi Research and Extension Center

 

Abstract

Recent research indicated maturity group III (MG 3) varieties planted early May matured earlier with yields equivalent to MG 4 or MG 5 varieties. Nineteen and 25 MG 3 varieties planted on a Leeper silty clay loam soil on May 6, 2015 and May 5, 2016, Verona, MS were evaluated. MG 4 (AG4632) and MG 5 (NK S55-Q3) varieties were included as standards for comparison. Both years NK S55-Q3 had the highest study yields of 76.9 bu/acre (2015) and 66.0 bu/acre (2016), but was not different from AG4632 yield of 69.0 bu/acre in 2015. In 2016, NK S55-Q3 yield of 66.0 bu/acre was greater than AG4632 yield of 56.3 bu/acre and all MG 3 varieties except Pioneer P41T33R yield of 59.2 bu/acre. In 2015, three of the MG 3 varieties, Pioneer P39T67R, P93Y92 and NK S39-T3 yields were equivalent to AG4632. In 2016, MG 3 varieties NK S39-T3, NK S39-C4, Mycogen 5N406R2, 5N393R2, 5N394R2, Pioneer P41T33R, P39T67R, P93Y84, and Dyna-Gro 32Y39 yields were equivalent to AG4632. The higher yield for NK S55-Q3 is possibly related to the late season growing environments. NK S55-Q3 reproductive phase was at the mid-pod-fill stage in early August and was able to take advantage of the August rainfall that totaled 7.36 inches in 2015 and 4.02 inches in 2016. The MG 3 varieties pod-fill stage had been completed by August 5^th and did not benefit from the August rainfall. MG 3 varieties (Pioneer P31T11R, P39T67R, P93Y92 and Dyna-Gro 32Y39) in 2015 and one (NK S39-T3) in 2016 evaluated for yield response to seeding rates (140,000 to 180,000 seed/acre) indicated no yield response to higher seeding rates.