h2 Sample Ve Soil Sunshine Units : All Soil samples listed below were obtained by Dr. Le. T. ilexander and extracted at the Soil Survey Laboratory, U. S. Department of Agriculture, Beltsville, Maryland. During the Spring of 1956, the Beltsville laboratory discontinued the ammonium acetate extraction procedure in favor of electrodialysis extraction, extraction is indicated for each sample, The method of Soil Survey Laboratory analyses on these samples include the determination of Na, K, Mg, Ca and Sr. A. Chicago Milkshed: Collected by Dr. L. Alexander, Soil Survey Laboratory, Plant Industry Station, U. S. Depart- ment of Agriculture, Beltsville, Maryland, and Dr. &, A. Martell, Enrico Fermi Institute for Nuclear Studies, University of Chicago, Chicago, Illinois, September 29 and 30, 1955. 1. CL 1019: Swanson Farm (#3), Winnebago County, Illinois, Carrington-like silt loam, Beltsville #551503, NH)AC extraction of 6.83 + 0,08 Ibs. soil, 0-8! depth, 20.0 g oxalate, 7.54 g oxide, 5.39 g Ca. 2. Holcomb Farm (#h), Rock County, Wisconsin, Carrington silt loam. ae CL 956: Beltsville #551500, NHAC extraction of 4 lbs. soil, 0-2" depth, 12.1 6.82 g oxide, 3.06 g Ca, g oxalate, be CL 957: Beltsville #551501, NH),AC extraction of lbs. soil, 2-6" depth, 12.1 6.21 g oxide, 3,18 g Ca, 3. CL 1018: g oxalate, Premo Farm (#6), Columbia County, Wis- consin, Miami silt loam, Beltsville #551502, NH),AC extraction of lbs. soil, 0-6" depth, 11.25 g oxalate, 3,9) g oxide, 2.79 g Ca. 26.7 +-1.0 3.61 + 0.14 15.0 + 0.5 ~ . Kurpeski Farm (#7), McHenry County, Illinois, Miami silt loam, a. CL 886: Beltsville #551496, Sample A, NH)AC 11.9 + 0.5 be CL 887: Beltsville #551497, Sample B, NH},AC extraction of lbs. soil, 0-6 or 7 Septt, 8.90 g oxalate, 3.35 g oxide, 2.36 g Ca, 12.6 + 0.5 ~ extraction of l lbs. soil, 0-6 or 7" Septti, 8.51 g oxalate, 3.21 g oxide, 2.2) g Ca. ~