In the recent years poly-farming has become a trend in traditional farming. Poly-farming have many advantages over traditional farming.It enables a farmers to grow vegetables and fruits throughout the year of different varieties irrespective of the soil or weather conditions.
But what exactly is poly farming is and how often is it related to open field farming?
A Poly House is a Structure made of polyethylene, usually in 3 shapes Barrel Shaped,Ridges and Furrow and Saw Tooth Shaped.The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside building faster than heat can escape the structure. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall.Temperature, humidity and ventilation can be controlled by equipment fixed in the Poly House. Poly house farming.Poly Houses can be used to provide a higher temperature and/or humidity than that which is available in the environment but can also protect crops from intense heat, bright sunlight, strong winds, hailstones and cold waves. This allows Flowers and vegetables to be grown at times usually considered off season. Every factor influencing a crop can be controlled in a Poly House.Poly Houses are mainly used in temperate regions in similar ways to greenhouses and cloches (row covers). Modern designs allow sowing and harvesting machines to move inside the structures so as to automate production.Poly Houses can be used by farmers to promote the cultivation of vegetables both on-season and off-season, and would actually help to moderate the market rate for vegetables and flowers in long run, on a year-round basis, and would help to satisfy local market needs.
Poly-farming is a technique of growing vegetables and fruits in a controlled environment,which is scientifically designed just like a plant needs to grow.In a poly house similar conditions are made to make a crop grow in a large structure.Greenhouses are constructed to provide the necessary light and darkness .
In poly-farming many varieties of vegetables can be grown like the colored capsicum and colored tomatoes along with various varieties of berries and Pepper.Efforts are made by Indian government to provide upto 40 percent of subsidy on poly-farming equipment(s) , which mainly include sheets and pipes to straighten the green house .
Aspects of Greenhouse Cultivation
I. Classification of Greenhouse
II. Design and Orientation of Greenhouse / Poly-house
III. Components of Green House
Classification of Greenhouse based on Suitability
A Low cost greenhouse is a simple structure constructed with locally available materials such as bamboo, timber etc.An ultra violet (UV) film is used for cladding materials. Unlike conventional or hi- tech greenhouses, no specific control devices for regulating environmental parameters inside the greenhouse are provided.Simple techniques are, however, adopted for increasing or decreasing the temperature and humidity. Even light intensity can be reduced by incorporating shady materials like nets.Temperature can be maintained in summers by opening the side walls. Such a structure is used as rain shelter for crop cultivation.This type of greenhouse is mainly suitable for a cold climatic zone.
Greenhouse users prefer to have a manual or semiautomatic control arrangement in order to save money.This type of greenhouse is constructed using galvanized iron (G.I) pipes. The canopy cover of such a greenhouse is attached to a structure with the help of screws. The whole structure is firmly fixed to the ground to withstand all disturbances against wind. Exhaust fans with thermostat are provided to control temperatures. Cooling pads for evaporation and misting arrangements are also made to maintain a favorable humidity inside the greenhouse.As these systems are semi- automatic, they, require lot of attention and care.It is very difficult and cumbersome to maintain a uniform environment throughout the cropping period. These greenhouses are suitable for dry and composite climatic zones.
To overcome some of the difficulties in medium-tech greenhouse, a hi-tech greenhouse where the entire device controlling environment parameters are fully automatic in nature
Classification of Greenhouse based on Cost of Poly-houses
Design of a Greenhouse for Poly-Farming
Components of a Greenhouse
4. Rigid Cladding Material: Cladding material with high degree of rigidity because any deformation of the structure may result in damage to it. Ex. Glass