You should use a "starter" fertilizer with a high phosphorus content in a hydroseeder to encourage root growth. You can use granular, time-released granular or water-soluble fertilizers in a hydroseeder.
About this Author
Melody Lee worked as a newspaper reporter, copywriter and editor for 5 years. In addition, she has edited magazine articles and books. Lee holds a degree in landscape design and is a Florida master gardener. She has more than 25 years of gardening experience, which includes working at nurseries and greenhouses.