This method is intended to provide technical farming three common green seaweed species rotations in ponds to yield higher output to use as raw materials for bioethanol production. Cultivation of three green seaweed species were repeating the steps involved in providing brackish vr sea water, green seaweed seedlings in a pond. The method involved the steps of (a) providing a first quantity of water from brackish and sea water outside with at least one additional fertilizer, wherein the water is conductive to growing seaweed. to a first predetermined depth in a pond
(b) introducing green seaweed seedlings into the conducive water
(c) growing the green seaweed seedlings for a pr.edetermined time
(d) harvestion of the first phase
(e) withdrawing at least partially the less conducive water after the tim
, (f) refilling the pond with a second volume of water to the depth of the previous depth and add a fertilizer
and (g) repeating steps b, c, d, e and f Introducing Enteromorpha into cultivation from JanuaryApril, Chaetomorpha from May-August and Cladophora from September - December. Initial seedling density with 500g wet/m2. The depth of water in the pond about 20-50 cm is conductive to growing these seaweeds.