I'm seriously considering purchasing this, what a cleaver idea!! Just read this article in Farmers Weekly and thought it was worth a share.
The following excerpt is from Farmers Weekly: https://www.fwi.co.uk/machinery/farm-maintenance/workshop-skills/northern-irish-inventor-reveals-his-best-machinery-creations
A slurry tanker and dribble bar can be an effective tool for establishing clover in a grass ley.
Typically, the seed is mixed with the slurry during filling, but it’s tricky to distribute it evenly throughout the load.
Albert O’Neill’s answer to this conundrum was to design a small hopper that feeds seed into the slurry between the fill pipe and the gate valve in a controlled manner.
Seed flow is adjusted using a small tap, allowing operators to match the output to the speed at which the tanker is filling.
The hopper is made from clear plastic so that it’s easy to see how much is going in and a breather pipe at the top prevents the sides of the tank being pulled in as it empties.
The hopper comes with its own section of galvanised pipe, complete with gaskets, so buyers can simply bolt it into the existing pipework.
For best results, Mr O’Neill says there needs to be some moisture in the ground when the seed is applied. Complete hopper kits can be purchased for £190.
UPDATE - I ordered it!! 😃