generally solar pv systems that generate electricity from sunlight cost between $ 2 50 to $ 7 per installed watt typically the larger the system the lower price per watt large commercial systems are typically well below $ 4 per watt
NASA researcher checking hydroponic onions with Bibb lettuce to his left and radishes to the right. Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent. Terrestrial plants may be grown with only their roots exposed to the mineral solution, or the roots may be supported by an inert medium, such as perlite or gravel. The nutrients in hydroponics can be from fish waste, duck manure, or normal nutrients.
Figure 1. Hydroponic Lettuce. Lettuce (see Figure 2) is a plant that has quite a small root system and is therefore particularly suited to being grown in water culture, or using the nutrient film technique (NFT).See the hydroponics systems page on this site for more information about these types of gardens.igure 1. Hydroponic Lettuce. Lettuce (see Figure 2) is a plant that has quite a small root system and is therefore particularly suited to being grown in water culture, or using the nutrient film technique (NFT).