Giant kelp can grow over a foot per day under ideal conditions. paule858 / Getty Images By Diane Kim, Ignacio Navarrete and Jessica Dutton Giant kelp, the world’s largest species of marine algae , is an attractive source for making biofuels. In a recent study, we tested a novel strategy for growing kelp that could make it possible to produce it continuously on a large scale. The key idea is moving kelp stocks daily up to near-surface waters for sunlight and down to darker waters for nutrients. Unlike today’s energy crops, such as corn and soybeans, growing kelp doesn’t require land, fresh water or fertilizer. And giant kelp can grow over a foot per day under ideal conditions. Kelp typically grows in shallow zones near the coast, and thrives only where sunlight and nutrients are both plentiful. There’s the challenge: The ocean’s sunlit layer extends down about 665 feet (200 meters) or less below the surface , but this zone often doesn’t contain enough nutrients to support kelp growth. Much of the open ocean surface is nutrient-poor year-round. In coastal areas, upwelling – deep water rising to the surface, bringing nutrients – is seasonal. Deeper waters, on the other […]

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