There was no differential response of row spacing to tillage systems. So far the only answers to this question are based on producer testimonials and observations by researchers. To date, it would appear that using wide row spacings did not lead to serious problems. Our research has shown no interaction between seeding rate and row spacing. The important factor is to ensure optimum plant populations, regardless of the row spacing being used.
Special attention has to be given to swathing, especially for cereal crops.
You may want to swath the cereal crop at a different angle than the seeding operation to provide better support of the swath. In the case of sensitive crops like field pea, flax and canola, it is recommended that the fertilizer be kept away from the seed. For other crops like cereals, it will depend on the total amount of fertilizer to be applied and the amount of seed-bed utilization. Studies with wheat and barley showed that above ground dry matter at anthesis decreased with row spacings going from 4 to 8 inches with little difference between 8 and 12 inches. The concentration of seed-placed P in the row increases as row spacing increases however, it did not increase grain yields in wheat and barley.