How can sound affect plant growth?

What is Joel Sternheimer's theory on music and plant growth?

Can playing just any type of music benefit plant growth?

What is Dan Carlson's Sonic Bloom system and how does it work?

Why are bird sounds considered beneficial for plant growth?

What are foliar sprays and how can they benefit plants?

How should foliar sprays be applied for optimal results?

Are there any precautions or warnings associated with using sound frequencies for plant growth?