A greenhouse is a structure that allows control of environmental factors to some extent such as temperature, humidity,lighting,air movement and pest/diseases.
- Flat to Gently sloping
- Adequate lighting from the sun
- Accessible and reliable water source
- Well drained site
- Stable and workable soils/use tubes where the situation is not practical
- Safe from lines of strong winds
- Access to source of heat in the temperate zones
- Proximity to storage/processing area
- Accessibility to cost effective materials
- Ability to achieve optimum temperatures
- Structural stability-shape,height, length, width,footing and wind,
- Roof drainage- slant slope 22-28 degrees
- Air circulation-10% of wall area is left for netting
- Desired flexibility in crops to be grown
- Expected level of mechanization
- The system increases agricultural output
- Economizes on space
- Saves irrigation water
- Improves farming income
- Improves food security
- The technology reduces crop pest and diseases incidences
- Allows growing of crops not suited to the region due to climate modification.
|Strawberry in a Greenhouse|
When operated correctly a greenhouse can give fresh produce throughout the year regardless of the season. The capacity to carefully control the temperature and humidity are important advantages of this farming system. Greenhouse system enables the use of modern technology such as hydroponics which involves growing plants in soil-less media, in a liquid which can be water infused with specialized nutrient mixes. This allows plants to grow larger and faster than normal, helping to maximize efficiency. The main disadvantage of greenhouse farming is high cost of buildings construction and maintenance, which in
In cool weather the circulation will be unnecessary in most cases. Soil fertility management practices are vital and they include crop rotation, regular application of compost, mulching, leaving the soil fallow to improve and maintain fertility. Apply fertilizers according to the soil requirements and the crops to be grown following soil analysis report. Fumigation or entire change of soil may be required before planting to clear crop pests and diseases. Fumigation involves saturating the greenhouse soil with pesticides like Dioxysan which releases fumes of Chlorine dioxide, (CL2) to control soil pest and diseases. In conclusion this is a farming technology whose time is ripe in Kenya.
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