Influence of Soil Compaction on Soybean Stand, Yield, and Phytophthora Root Rot Incidence
1986
Gray, L. E. | Pope, R. A.
Soil physical factors can influence plant growth and disease incidence. The objective of the present research was to determine if soybean [Glycine max (L.) Merr.] stand establishment and Phytophthora root rot incidence were influenced by soil compaction under Illinois growing conditions. Field experiments were conducted for 2 years (1983 and 1984) on a Drummer silty clay loam soil (fine-silty, mixed mesic Typic Haplaguoll). Plots were compacted once in the spring of each year after the first disking by driving a tractor over the plots. Soil bulk density was increased significantly in both years by tractor compaction. In both years, initial stands and final stands for ‘Corsoy’, (susceptible to Phytophthora megasperma Drechs. f.sp. glycinea Kuan and Erwin) were reduced in the compacted plots. In 1983 there was no effect of soil compaction on initial and final stands for ‘Corsoy 79’ soybeans (resistant to races 1,2,3,6,7,8, and 9 of P. megasperma f.sp. glycinea) but in 1984 final stands were lower with Corsoy 79 on compacted plots. The number of plants killed by the fungus was significantly increased by soil compaction for Corsoy in both 1983 and 1984. In 1983 there was no difference in seed yield of Corsoy 79 in compacted and noncompacted field plots. In both years the yield of Corsoy was significantly lower in the compacted plots. There was also a significant difference in yield between Corsoy and Corsoy 79 in both years in the compacted plots.
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