|
Brazilton KS | 7.5 is better on the face of it, all else being equal.
The thing is that all else is not equal. A planter unit does a considerably better job of putting seed in the ground then a drill unit (except possibly for a 750-type single disk with gauge wheel). Score one for 15". Half as many openers means half as much time wasted adjusting the planter/drill. Score two for 15". Planter meters will deliver what they are set for, without further calibration which takes time. Score three for 15". More clearance yields less plugging. Score four for 15".
So, from my point of view, 7.5" is definitely better agronomically but 15" wins on equipment factors. | |
|
15" vs 7.5" soybeans
