What are greenhouse crops?
greenhouse crops are fruits and vegetables grown inside a building or cover to protect them from elements and allow a longer period of growing season. Growing greenhouse plants can be more expensive than planting in fields, but in some areas it may be a necessity due to rare water supply or environmental conditions. The greenhouse can be a permanent structure with glass or plastic windows for light or temporary structures made of frames and plastic film.
Early greenhouses were buildings of wood or metal frames with glass windows, often connected to the house. The sun provided both light and heat needed to grow vegetables or flowers in a more controlled environment, or when temperatures outside dropped under freezing. The seeds could be spewed early in the spring, and some vegetables could be grown late in autumn, especially if another source of heat, such as a wooden stove or steam radiators, was provided.
the cost of glass and its ability to break the development of plastic greenhouses rezistolly on breaking in the 20th century. The plastics were much lighter, they could be made with the addition of pigments to block a part of the sunlight to make them translucent and form in shapes to allow curved windows or domes. These structures were often permanent buildings used for special vegetables, herbs or flowers and were built on a smaller scale for residential or small commercial growers.
commercial greenhouse crops were not considered cost -effective until the end of the 20th century. Requirements for agricultural land for residential development and rising fuel costs for the transport of fruit and vegetables have intensified smaller production at greenhouse schools. Increasing interest in ecological products or those products grown without artificial fertilizers and pesticides, provided that the customer base is willing to pay more for a greenhouse with a higher price.
Large commercial greenhouses began to useLarge metal structures and plastic film, which were sometimes built directly above field crops. These structures were relatively easy to assemble and could be dismantled and moved to other places as needed. Most of these structures were not heated by auxiliary heat, which would be too expensive, but was used in areas where adequate sun could provide radiant heat to extend the growing season.
Water birth has also become a growing problem because drinking water supplies were more limited. Greenhouse crops can be grown by water protection techniques such as dripping or irrigation of fog, which provides the optimum amount of water needed for plant growth. Controlled temperatures and humidity may allow the use of much less water to harvest than required in the fields.
Environmental control in the greenhouse can be carried out with controls associated with the humidity temperature. If temperatures rise above the required limits, there may be windows or ssentences open manually or controlled by electric motors. Moisture checks could provide the same function to prevent moisture that could stimulate mold. These improvements contributed to the cost of greenhouse crops, but provided more consistent product quality.