This may vary from year to year depending upon weather. Be sure pressure at the sprayer nozzle is 30 to 40 psi. Your goal should be to obtain a suitable seedbed that can be planted into satisfactorily with existing hoe drills. This may mean an additional 1 to 3 inches of water available for crop production compared to fields where the residue has been destroyed. Wheat stubble reduces soil temperature and evaporation, thus increasing moisture available for crop growth.
Residues reduce wind and water erosion.
Additional residues will improve water erosion control. The amount of straw left at planting should match the clearance capacity of the drill. Straw can be redistributed by using a mulch treader or by pulling a rotary hoe backwards with the teeth interlocking. Fertilizing should be done according to soil tests. Starter fertilizer should be considered since soils under residue are cooler than bare soils.