Jason said:
The regular drill is going to be tougher to set.
As for mixing it, just keep track of the portions. If you want to seed a bushel an acre of oats, wheat whatever, use the weight and add the pounds per acre of grass seed you want.
An air seeder can be calibrated with so many hand turns of the metering system. You turn it the number of turns and weigh the mix that comes out. For 1 bus of wheat (60 pounds) plus the 10 pounds of grass seed, it is 70 pounds of the mixed seed.
A regular seed drill you would have to guess (start with a slightly higher setting than the one for just 60 pounds of wheat) drive a marked distance and refill the drill with weighed buckets. Some drills would be easier than others as the settings are easier to work than others.
My old DK5's are 7 feet each and each one has a highly variable rate set. They seem to change the setting over the course of the same field. I reset them 6 times over 600 acres this year. Needless to say I rent a valmar set up to seed grass.
Thank's Jason,that helps me out a lot.I took my fertilizer suppliers advise on how to seed grass,since i bought the seed from them.They first of all told me to use a valmar,with the valmar the bromegrass kept plugging the runs.So then they told me to use the fertilizer spreader because everyone that had used it had good luck that way.They said the fertilizer spreader would cover 80 feet,so if i went on 40 foot passes it would double up and i would have an excellent catch.For some reason on the last field i seeded this spring,i wanted to see just how even it was spreading.So the neighbour suggested laying out a tarp to see where it was all landing,i was very disappointed

to find out it was only covering 20 feet,and not the 80 feet they told me it was going to cover.I bought more seed then i needed in the first place,because the fertilizer spreader was not very accurate in pounds seeded an acre.Now i have to buy more seed again because the seed i put down,didn't cover the area they said it would.So now after i bale the oats off,i can go back this fall and seed the 20 foot strips that were missed every round

.I wouldn't mind if we were in a drought and it didn't germinate that i had to redo it again,but when it is as wet as it has been this spring it really pisses me off

!!!My biggest downfall in life,is trusting people to much.Another lesson learned the hard way.