Step 6: Diagnosis
Mechanical: Chaff Spread Unevenly
The presence of heavy residues, plant symptomology, and the distance between infected areas indicates that the cause is an excessive and unequal distribution of plant residue from the previous harvest resulted in inadequate seed to soil contact and cooler soil conditions. These factors led to reduced germination and slower growth of plants within the heavy residue areas.
Recommendation for Producer:
It is recommended that the producer invests in a better chaff spreader for his combine. Under high residue situations, cut the crop at a higher stand height or spread the straw around using light harrows prior to seeding.