Question

1. After wheat harvest you have 7 tons of residue remaining on the field. Your disk is set to leave 60% of the residue each time you make a pass through the field. Your vertical tillage tool leaves 85% of the residue for each pass. Your field cultivator leaves 80% of the residue each time you use it. How many tons per acre will you have left, if you vert. till your field once, disk twice, and then field cultivate once before corn planting in the spring? Assume you lose 15% of your cover over winter.

Answer 1

7 tons, F 0.6, F= 0.85, Fe=0.8, Fi0.15 Given: Total residue

0.66 Fde

Fte Fi(1- F x Fi 0.85 +(1-0.85) x 0.15 0.8725

Fce Fe(1- Fe) x Fi 0.8+(1-0.8) x 0.15 0.83 се

Residue After all processes Total residue x F x Fe x Fee de

Residue After all processes 7 x 0.662 x 0.8725 x 0.83

Residue After all processes 2.208 tons