ABSTRACT
Intensive tillage was used for weed control during the fallow period. Stubble mulch tillage practices were developed during the 1960s that improved precipitation storage efficiency by maintaining more crop residue on the soil surface during the fallow period. Tillage is performed with sweeps and rodweeder operations during the 19-month fallow period as needed. Average number of operations is six, which incorporates about 55 to 65% of the previous crop residues by wheat planting time. A native grass site is located adjacent to the tillage plot area. This area could be sampled as a reference site to document changes in soil quality caused by long-term crop production practices. Grain yields were generally not significantly affected by tillage system at the 0.05 probability level in any year. Tillage system did not have a significant affect on straw yield in any of the years reported, except for 1979.
