Polyhouse farming is the same as greenhouse farming. The "poly" part of the name refers to polyethylene plastic, which is the material used to cover the house, and being transparent to translucent, it lets sunlight in for photosynthesis and plant growth, while reducing detrimental organisms from affecting the crop.
Polyhouse farming is farming under full controlled condition., temperatures humidity, water fertilizers every thing is automated. if done rightly around 6-7 lakhs net profit can earned in a year on one acre. Generally Gerkens, Bell pepper or Capsicum, or horticulture cut flowers can be cultivated.