Cooling a greenhouse with evaporative pad-and-fan
Pad-and-fan systems, also called evaporative pad-and-fan systems, is the most common method of cooling a greenhouse in warm weather regions. Although not optimal, it is better...
Category Archives: Systems
Hydroponics systems consist of two parts, the structure and irrigation system. Structures can be made of various materials such as glass, shade net etc. The irrigation system is either ‘open’ or ‘closed’.
Cooling a greenhouse with fogging nozzles
Many growers have tried reducing temperatures (cooling) with fogging nozzles. The concept of spraying the air with microscopic water droplets which absorb the heat in the...
Natural ventilation in humid regions.
Ventilation of greenhouses in humid tropical areas presents the grower with a complete new set of problems. There are various methods available but none have...
Natural ventilation of single span tunnels in arid regions.
Arid regions are characterized by low rainfall, low humidity and high temperatures during summer. The largest problem is temperature during the day time inside the...
What is natural ventilation
Ventilation is the exchange of air inside the greenhouse with air taken from outside the greenhouse using either natural or forced methods. Ventilation efficiency...
What is the difference between LDPE and HDPE Irrigation pipes
LDPE HDPE Difference is crucial when designing a good system. You can either save a lot of money initially and waste a lot later when...
Which hydroponic irrigation pumps should be used
Hydroponic pumps are at the heart of your irrigation system. Many people tend to neglect this area just because they do not understand what is...
Cheap inline sediment filter that works
Installing a sump on small closed hydroponic systems is also easy. The same basic concrete sump can be build but a simple ‘T-piece’ as described...
Simple method to keep hydroponic NFT nutrient tanks clean
The irrigation water of hydroponic systems must be filtered to keep foreign objects out of the system. Open systems are relatively easy to filter since...
What is the optimum gravel depth for hydroponic channels
The correct gravel depth is important for the development of the roots system. Too shallow gravel will not only restrict root development and volume, but...
How to lay out a dripper irrigation system
A basic layout of a dripper irrigation system is provided using bags. Note the position of the filters in relation to the pump and water...
Calculating the correct flow rate for open hydroponic systems
There are two basic types of dripper systems used in bag culture; 1 mm spaghetti pipes and 8 mm pressure regulated dripper (also called a...
Manage the root temperature in growth bags for optimal growth
Root temperature does play an essential part in plant growth. It influences plant dry-mass, uptake of nitrogen, phosphorus and potassium. Root zone temperatures between 18–22°C...
How to mix fertilizers in a nutrient tank
The following procedure should be followed when mixing fertilizers in nutrient tanks: Fill the tank with water Check if the pH is between 5.5 and...
Nutrient tank design with pumps and filters
Bag culture systems requires the use of large tanks to store the nutrient mixture. The tanks are important because: The nutrients are mixed and stored...
