Maximum Yield USA 2015 December | Page 88

ACCESSORIZING YOUR GROWROOM pH and EC Monitors – Measuring pH and EC in traditional or hydroponic growing methods is important. Luckily, there are plenty of useful accessories to help you understand these factors—new technology has allowed for affordable, extremely accurate digital-testing pens and automated dosing equipment. pH and EC measuring pens are generally durable, easy to use and a reliable means of monitoring small- to mediumsized crops, while larger monitors and controller modules allow growers to completely automate the nutrient solution and pH adjustment processes. Climate Control Once you understand your growroom’s environment, the next step is to try to replicate the natural environment for your selected plant species. This involves the controlled regulation of lighting, temperatures, airflow, and relative humidity and carbon dioxide levels. With hydroponic systems, we also need to ensure we provide an ideal setting for plants’ root masses, including maintaining optimal reservoir temperatures, dissolved oxygen concentrations, and pH and EC levels. By selecting and optimizing the appropriate accessories, you can fine-tune your horticultural variables and get the very best harvest from your plants’ genetics. “ By selecting and optimizing the appropriate accessories, you can fine-tune your horticultural variables and get the very best harvest from your plants’ genetics.” Heat Mats – Depending on your location, the first accessory to assist with climate control is a propagation temperature fixture for starting seeds or cuttings. In colder climates, this generally involves heat mats. When selecting your heating accessories, we recommended first ensuring you have a thorough understanding of your current and future climatic conditions, along with the desired conditions of your chosen plant species. Premium heating equipment should always include a variable thermostat, although measures can be taken to prevent under- or overheating. Some manufacturers recommend placing an insulating layer below the mat to increase temperatures, or between the mat and your propagation dome to reduce substrate temperatures. A warmer substrate will increase underground chemical activity, and a lower ambient air temperature will slow transpiration. For best results, keep your rooting medium between 75 and 80°F, and the air temperature 40-50°F cooler than the substrate. Water Heaters – When using aeroponics, deep water culture (DWC) or a recirculating hydroponic system, a water heater may be required depending on your climate or growroom location. A well-aerated reservoir should be kept at an optimal temperature of 60-72°F. If your reservoir temperature is any lower, plant growth may be stunted. If your temperatures reach any higher than 80°F, less oxygen is available for plants and the roots will become more susceptible to rots, wilts and pest attacks. Always ensure your water heater has a built-in thermostat controller and remains fully submerged. If a heater dries out, it can burn out and quickly become a fire hazard. 86 Maximum Yield USA  |  December 2015