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Fig. 6. Relationship between soybean cyst nematode cyst population density [log10 (cysts 100 cm–3 of soil + 1)] and the proportion of each soil fraction in the sample. Means ± standard error for Field A (open circles) and for Field B (closed circles) are indicated. The left column (A, B, C, and D) corresponds to the percentage of sand, the central column (E, F, G, and H) corresponds to clay percentage, and the right column (I, J, K, and L) corresponds to silt percentage at (A, E, and I) planting 1999, (B, F, and J) harvest 1999, (C, G, and K) planting 2000, and (D, H, and L) harvest 2000. Regression curves fitted are indicated as solid lines (Field B) and dashed lines (Field A) where significant (0.05 significance level). Regression coefficients are shown in Table 3.
