Corn planter mystery

After looking at my corn fields after the flood has finally left the area and some drying has begun I saw that some of the rows are much greener and taller than the next 4 rows. I used a Jd 7000 planter and applied fetilizer to plant.
There is a slight slope to the field and it was planted up and down the slope.
The variation is very noticable and and I have not been able to figure out what caused this to happen.

I had this same thing happen one other time using a different planter but that was a number of years ago and I blamed the planter. It has only affected about 10 of the 4 row plantings or 40 rows of corn and the shorter corn is beginning to catch up with the taller stuff but I doubt it will be as productive. If anyone knows what is going on with my planter I would like to know. My other corn fields look great.
 
Does the shorter poorer corn start right with one pass of the planter?

Is it all the same variety of corn?

Sounds like your fertilizer shut off or ran out.

Gary
 
Not familiar with that planter, but...

Did it not drop all of the way to the ground due to the slope? What comes to mind is what happened the other day with the JD drill. Everything was engaged but raised for about 30 feet. No beans dropped to the ground - they were all in the tubes because raising the openers had caused a bend in the tube. The second the openers were dropped a jillion beans dropped to the ground. Could the fertilizer have done the same thing? Is it obvious the top of the rise got way more than it needed?
 
Thanks for your information and help. It was all the same corn variety but as was stated it was poor quality and very small seed. as for the planter not being all the way down because of the slope, I will check that next time I plant in a year or so.
The mystery continues though because it only did it on a small part of the field.
Thanks for your help,
 
I do suspect that the fertilizer is somehow not feeding as I go up the slope. But I can not figure out why. It only did it for a few rows and then things are normal again. Fertilizer hoppers were full and and all seemed OK. I planted another 20 acres on a slope and no problems. Still a mystery. Thanks for your help.
 
Maybe before you went up the slope, you rolled back with your planter down which filled the drop tubes with dirt. When the dirt finally fell out, it started fertilizing again?
 

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