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can amount of water be considered as the limiting factor of photosyn?

In theory, yes, but it usually isn't as a plant needs relatively little to keep photosynthesis going, so people usually focus on light, CO₂ and temperature.

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Original post by Tintin1912

Water is a product of photosynthesis therefore, no it can’t as a limiting factor limits the reaction which intern limits the products. Limiting factors could be: temperature, CO2, light intensity, chlorophyll concentration. The limiting factor needs to be involved with the reaction itself.

Water is definitely not a product of photosynthesis. (Are you thinking of respiration?)

Carbon dioxide + water ––> glucose + oxygen
Reactants ––––––––––––> products

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