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Response of Six Diverse Genetic Lines of Soybeans to Different Levels of Soil Fertility¹

Experiments were conducted at the Rice Branch Experiment Station, Stuttgart, Ark. on a Crowley silt loam soil for a 6-year period to evaluate the response of four soybean varieties (‘Lee,’ ‘Hood,’ ‘Ogden,’ and ‘Arksoy’), a strain (R56-49), and a plant introduction (PI-91,120) (to three levels of soil fertility. Significant increases in seed yield were obtained each year from the application of 49 kg/ha of P and 93 kg/ha of K. However, when this rale of fertilizer was doubled, yields were not significantly higher than those obtained from the moderate rate.

Each year certain of the genetic lines produced increased yields when grown at the high fertility level, but when this line was evaluated in a different environment the following season, it usually did not produce this unusual yield response. The commercial varieties were just as responsive as the lines which had been selected for their ability to produce increased yields with high fertilizer rates. There was some indication that trie Arksoy variety failed to respond to fertilizer application as much as other entries.

Key Words: Seed yield • Glycine max (L) Merr. • Fertilizers • Genetic lines

² Professor, Department of Agronomy, and Dean, College of Agriculture and Home Economics (formerly Professor of Agronomy), University of Arkansas, Fayetteville, Ark. 72701.

Received for publication August 28, 1969.