Which biome has the highest primary productivity?

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Primary productivity is the rate at which producers convert sunlight into new plant biomass. The tropical rainforest has near-continuous warmth, abundant sunlight, and heavy rainfall year-round, creating ideal conditions for photosynthesis and rapid plant growth. This leads to a very high rate of biomass accumulation and quick nutrient cycling, resulting in the largest net primary production among biomes. Deserts lack water, tundras have a short growing season and cold temps, and savannas have only seasonal rainfall, all limiting productivity relative to rainforests.