Im a firm belever of Planet Jr's but the newer PJ's are not built like the older ones, they stuck with the flat bar flex frame design with the internal seed plate and was made so well it has not changed for over 30 years with the exception of the hopper which is now polypropylene instead of tin metal and the wheels. The packing wheel's spring can be adjusted to fine tune how much pressure is exerted over the seeds lending itself quite well to sensitive seeds such as beans and corn. My No. 4 has the external hopper opener for corn and works very well with out skipping a beat, no plate to damage the corn or jam up during drilling, only catch is the hopper compacity is limited compared to the JD
models but farmers have fab'ed up hopper extention, a 3 gang on a tool bar was great for drilling on beds.
I was very pleased with the performance and precision of drilling with the Cole Multiflex Corn Planter, a soild heavy unit that flexed well with the ground and fertilized at the same time but it did require something of a 25 hp tractor to pull it and the hoppers has gone to polypropylene.
As much as i know about this i will rely on your experties Jeff, i don't have the many years of trial and error you have acquired from truck gardening, or the accumulated knowledge of the drill seeders.
Edited by trowel, March 08, 2012 - 09:36 AM.