"y" "soil" 6 "sand" 10 "sand" 8 "sand" 6 "sand" 14 "sand" 17 "sand" 9 "sand" 11 "sand" 7 "sand" 11 "sand" 17 "clay" 15 "clay" 3 "clay" 11 "clay" 14 "clay" 12 "clay" 12 "clay" 8 "clay" 10 "clay" 13 "clay" 13 "loam" 16 "loam" 9 "loam" 12 "loam" 15 "loam" 16 "loam" 17 "loam" 13 "loam" 18 "loam" 14 "loam"