| Penetrometer=1.60 + 0.10 A + 0.1B + 0.10 C + 0.19D + 0.018AB−0.022AC + 0.022AD-0.0140BC + 0.0140BD-0.040CD + 3.10A2 + 3.10B2 + 0.030C2 + 0.075D2 (3) | A: Chaff B: Manure C: Biosolids D: Bla ck Strap |
| Wind tunnel=20-1.48A-0.2B-0.35C-2.55D + 0.14AB + 0.14AC + 0.63AD + 0.63BC + 0.07BD + 0.09CD-0.72A2 + 8.29B2-4.6C2-1.5D2 (4) |
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