Soil Wind Erosion Hazard of Spring Wheat-Fallow as Affected by Long-Term Climate and Tillage

摘要: We hypothesized that drought accelerates wind erosion by increasing plant and soil factors of erodibility together, compounding the hazard. Erodibility measured in biennial spring wheat-fallow on Pachic Typic Haploborolls were (i) soil-inherent (SIWE) rotary sieving, (ii) surface roughness pin meter chain methods, (iii) standing residue profile, (iv) coverage photographically. Four tillage treatments ranged from low (LR) to no-till (NT). The erodible fraction (a SIWE measure) changed 53% during a dry period (1989-1990) less 26% wet (1992-1994). Median protection values calculated flat measurements made after seeding were, respectively, 16 43% 1989 1990, 80 76% 1992 1994. Soil losses estimated RWEQ model equations 11 6100 times greater compared with No-till was protective, LR up 3000 than those NT, However, yields 1988 (930 vs. 3640 kg/ha avg.) resulted inadequate even NT; NT 13 8 Mg/ha, respectively. Results indicate small grain-fallow is nonsustainable long term soil-erosion perspective.