Nutrient Technique Film (NFT) hydroponics can be done without a greenhouse. This technology is becoming popular among hydroponic growers due to its ability to save investment capital. The capital savings can then be allocated to building an NFT installation.

For example, a hydroponic greenhouse using bamboo construction with a plastic cover costs IDR80,000 per square meter, while the cost of an NFT installation using cement cast legs is around IDR130,000 per square meter. Eliminating greenhouse costs can result in up to 62% savings per square meter for growers.

It has been proven that hydroponic vegetables grown without a greenhouse still meet market criteria, such as being smooth, brightly colored, and fresh-looking, without insect or fungal infestations. Providing the right nutrients is key to ensuring healthy plants that are resistant to pests and diseases.

Hydroponics without a greenhouse still presents challenges, particularly about water quality in the nutrient basin. The absence of sterilization can lead to wilted lettuce seedlings around 20-25 days after planting, with mushy stems and roots. Therefore, water sterilization is crucial for NFT hydroponic cultivation without a greenhouse.

Hydroponics in a greenhouse allows for easier control of plant-disrupting organisms and sun intensity. Hydroponic growers who do not have a greenhouse face greater challenges in controlling pests, diseases, and sunlight intensity. High levels of sunlight can lead to low levels of dissolved oxygen in the nutrient solution, which can cause plant roots to rot. However, this issue can be addressed by using an aerator in the nutrient basin.