Klinger,
Yes you can use liquid fertilizer, if you can find the proper mix. 11-37-0 or 10-34-0 are generally recommended. Initial dose should be about 2 gallons/acre, with 2 followups at 3 week intervals at 1 gallon/acre . Be sure and dilute at least 10 to 1 with water and apply in boat propwash or with a large capacity sprayer or gas pump. Make sure not to overfertilize so after the initial three doses, watch for the bloom and fertilize accordingly.
