Answer for Can you spray PlotBoost and PLotStart the same day

Absolutely! The real advantage here would be if you were treating an existing food plot. In fact, the products are extremely compatible so you can mix them in the same tank and only have to make a single pass.
There is not a big advantage to spraying both on just planted seeds. The germination boost in the PlotStart is plenty to get the plant going, and the PlotBoost enhances its growth and nutrients once it is actively growing. Though PlotBoost is soil active as well as foliar active, the most efficient use is on growing plants so you get the benefit at both ends (roots and leaves).