###### Abstract  
_Azolla_ spp. is a prominent macrophtye and one of the world's fastest growing plants, making it a highly important resource that has been widely exploited as a biofertilizer, food and feed, and biofuel production. As a result, the uses, promotion, and application of _Azolla_ spp. in sustainable agriculture would be of significant interest. The objectives of this study were (i) to assess the feasibility of using _Azolla_ as a growing media of melons with a reduction in frwhich is called \"nutrient solution\". This system has advantages in the reduction of soilborne infections, the capacity to regulate the concentration of plant nutrients and water used, and the reduction in nutrient unavailability form [3]. This technique can be utilized in the production of several horticultural crops and vegetables, such as lettuce, strawberry, tomato, and melon [4]. Coconut fiber is generally used as a growing medium. However, it contains low nutrients which do not meet the plant needs and requires them to be mixed with other components such as organic fertilizers, cow manure, green manure, etc. [5]. Because animal manure can occasionally be a cause of plant disease, foil odor, greenhouse dirt, and some human pathogenic microorganisms that pose potential hazards to human health [6], it may not be advised to use it as a component of the melon growing medium. Green manure might be suitable for the component. Fertilizer is a high proportion cost (38-50% of variable cost) for our previous cultivation, and one of the key successes for melon production. Thus, the alternate source of fertilizer is crucial for reducing production costs by minimizing the use of fertilizer in melon production.  
Azolla spp. is a water fern that is used for several purposes in agriculture, such as biofetilizer, animal feed, growing media, etc. It is the host of N-fixing cyanobacteria (_Anabaena_ spp.) and occurs in fresh water of tropical to warm-temperate regions [7]. The symbiosis of _Azolla-Anabaena_ is capable of fixing atmospheric nitrogen at 1.1 kg N ha\({}^{-1}\) day\({}^{-1}\). _Azolla_ spp. has a low C/N ratio which releases minerals faster than other organic fertilizers. It provides 60-80% of nitrogen in a couple of weeks when incorporated in soil with logged water [8]. _Azolla_ spp. contains high organic matter, crude protein, vitamins, and multiple plant nutrients, especially trace elements [9]. _Azolla_ spp. has generally been used in rice cultivation as a green fertilizer. In addition, it was also used as a biofetilizer in various crops such as tomatoes, taro, bananas, wheat, corn, etc. _Azolla_ spp. has a positive effect on soils in both physical and chemical features by lowering the ammonia volatility that occurs after the use of chemical nitrogen fertilizers [10]. Currently, the utilization of _Azolla_ spp. as a biofetilizer has been used in several crop productions because it has several advantages as compared to chemical fertilizers. The advantages are (1) it is inexpensive, making use of freely available solar energy, atmospheric nitrogen, and water; (2) it utilizes renewable resources, as opposed to chemical fertilizer production, which is dependent on petroleum; and (3) it provides for plant nutrients and other substrates that are advantageous to plants or some animals, such as growth promoter intermediaries, vitamins (vitamin A, beta-carotene, and vitamin B12), amino acids, etc. [11]. From the positive aspects of _Azolla_ spp., it might be beneficial for melon growers if _Azolla_ spp. can be used as a growing medium with a reduction in fertilizer used. Hence, the objectives of this study were (i) to assess the feasibility of using _Azolla_ spp. as a growing media of melons with a reduction in fertigation concentration in a soilless culture system and (ii) to compare the agronomic and fruit quality traits of melons grown in different _Azolla_ treatments. The findings of this study can be applied further by researchers and farmers, potentially impacting food security and sustainability.