Effect of Residue Management Methods on No-Till Drill Performance

Excessive crop residue on the soil surface impedes drill performance and subsequent crop production inconservation tillage systems. To address this issue, 10 different residue management strategies were evaluated to determinetheir effect on no-till drill performance in terms of seedling establishment, early plant vigor, and crop yield. Field conditionswere characterized by size, concentration, and distribution of residue. Residue management strategies included leaving tallstanding stubble, using various chopping and spreading devices, and removing the residue by baling. Experiments wereconducted in northeastern Oregon fields that had been previously seeded to winter wheat and produced 9.8 and 10.5 t/ha ofresidue in 2000 and 2001, respectively. Winter and spring wheat plots were seeded with a hoe-type no-till drill. For the residuemanagement methods used in this study, stand establishment and seedling dry weight were reduced by 20% to 58% and 22%to 46%, respectively, when the full quantity of residue was left on the soil surface as compared to those where the residueconcentration was reduced by baling. Seeding into high concentrations of residue left by non-uniform residue distributionsystems also caused reductions in stand establishment and early plant growth. Long standing stubble and high concentrationsof loose straw greater than 18 cm in length caused unacceptable drill plugging. Successful drill operation was achieved incrop residues exceeding 9.8 t/ha when stubble height was less than or equal to row spacing and the majority of cut straw wascut into pieces less than 18 cm long. Although consistent yield differences were not found, the results of this study showedthat residue concentration and size have an important influence on no-till crop yield potential and drill operation.