Gleba tip: you can block the output of the agriculture tower

To my dismay, I discovered that the agricultural tower has two functions: planting and picking. This is trouble because a simple on/off switch is not sufficient means to control the process. While preventing planting is trivial: no seeds, blocking picking requires a bit more creativity: cramming some spoilage into the output which will allow the machine to plant but not pick, and you can then use a second machine to pick and not plant thus giving you control over how much you produce.

Not sure if this is helpful for everyone, but for those who it is, I wanted to share.