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Red duckweed (Azolla spp.) It is a small aquatic plant that is of great agricultural and environmental importance. Because it is a plant that can live on the surface of the water and grow quickly, the red duckweed has a special ability to fix nitrogen from the air by living with the blue-green algae type Anabaena azollae, which lives inside the leaf cavity of the red duckweed. This dependent relationship allows red duckweed to increase the amount of nitrogen in the soil and water sources effectively. As a result, the red duck is widely used in agriculture, such as being used as a fresh plant fertilizer in rice fields. Soil restoration and improving water quality Cow dung is an organic material of natural origin and contains macronutrients such as nitrogen, phosphorus and potassium, as well as micronutrients necessary for plant growth. When cow manure is fermented or dissolved in water, it will increase the amount of nutrients and promote the number of beneficial microorganisms in water sources. As a result, the aquatic ecosystem is more abundant. Photosynthetic microorganisms are a group of microorganisms that can use light energy to create food and live. It plays an important role in the decomposition of organic matter, reducing bad smell, reducing the amount of waste in water, and helping to balance the aquatic ecosystem to be suitable for various organisms. The use of photosynthetic microorganisms with cow dung may have a positive effect on water quality and red growth. Therefore, the research team is interested in studying the quality of water with the addition of photosynthetic microorganisms and cow dung to see how it affects the growth of red duckweed. To use the information obtained as a guideline for improving and preserving water quality sustainably Including being able to apply the benefits of red duckweed cultivation and conservation agriculture in the future.