Fourth, the decomposition of organic matter such as compost will create carbon dioxide. Finally, the use of compressed bottled carbon dioxide is the most commonly used way to create the gas in a greenhouse for the desired effect. Large greenhouses have burned hydrocarbon fuels for years in an effort to increase growth in their plants. Identifying Spider Mites on your Hydroponically Grown Produce It is important to identify and get rid of any insects living in your hydroponics system. Insects such as spider mites can destroy your hydroponically grown produce. Spider mites like many pests can be terminated in several ways. The best way to avoid a spider mite infestation is by taking precautionary measures. Hydroponics is always a soil less culture, but not all soil less cultures are considered to be hydroponics. Many of these cultures do not use the nutrient solutions, which are required for hydroponics. There are two main types of hydroponics, which are solution culture and medium culture. Solution culture uses a nutrient solution but does not use a solid growing medium for the roots. Plants can be placed much more closely together than in traditional fields; as many as four times as many plants can be grown in the space using hydroponic techniques as opposed to traditional methods. Secondly, hydroponics eliminates many of the problems associated with traditional farming that leads to sickly, damaged, or wasted crops. The speed of growth combined with the control over the growing environment means higher quality crops. The worry over soil born diseases and pests are greatly reduced, plus weeding is a thing of the past. For commercial growers, rapid harvest and higher yields are great reasons to grow hydroponically. A small greenhouse can cost considerably more because you will need to either include a cement floor and drainage system or lay other types of flooring such as gravel before you build the greenhouse itself. Many small greenhouses cost anywhere from $500 to over several thousand dollars, depending on the add-ons you choose.