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Fig. 2. (A) Location of sampled sites and soil series present in Field B. Crosses indicate the location of samples collected for the determination of soybean cyst nematode population density (see Fig. 1A); black circles indicate which of those samples were also used for soil particle size analysis. Soil series are (1) Newaygo sandy loam, (2) Brookston loam, and (3) Berville loam. Soil series map was digitized from Threlkeld and Feenstra (1974). Spatial distribution of (B) sand, (C) clay, and (D) silt percentages in the soil as interpolated by universal kriging within the area sampled. The shadings in B, C, and D represent percentage ranges. (E) Soil type delineation determined based on the proportion of sand, silt, and clay. Soil types are (1) loamy sand, (2) sandy loam, and (3) sandy clay loam.
