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Genotypic Response to Potassium in Soybeans¹

Soybean [Glycine max (L.) Merr.] genotypes usually yield about the same under high K fertility as under moderate K fertility. The objective of this study was to verify the results of a preliminary screening test, which revealed that the FC31702 and ‘Lincoln’ genotypes were responsive and nonresponsive, respectively, to high K fertility.

FC31702 and Lincoln soybeans were grown under moderate (approximately 130 kg K/ha) and high (approximately 193 kg K/ha) K fertility on a Beltsville silt loam soil for 3 years. ‘Cutler,’ a recommended cultivar for Maryland, also was included the last 2 test years. Seed yield and percent K in the leaves during the growing season were determined.

Key Words: K fertility response • Soil tests • Plant tissue tests • Glycine max (L.) Merr.

² Former graduate research assistant, (now research associate, Dep. of Agron., Iowa State Univ., Ames IA 50010) and former associate professor (now director of soybean research, Asgrow Seed Co., Ames IA 50010). Dep. of Agron., Univ. Md., respectively.

Received for publication January 8, 1975.