Author Archives: Robert Hansen

About Robert Hansen

Robert Hansen (hansen.2@osu.edu) is a retired adjunct assistant professor in the Department of Food, Agricultural and Biological Engineering at Ohio State University.

Manage pH And Soluble Salts In Hydroponics

Hydroponic greenhouse production has garnered increasing interest nationwide. For growers transitioning from greenhouse container production to hydroponics, it is important to be aware of some differences in monitoring pH and EC (electrical conductivity, a measure of soluble salts). This article discusses these differences and presents a case study in pH and EC monitoring. Acquiring Target

Save Water With Automation And Sensors

Automating irrigation is a great way to save water. One of the latest innovations in irrigation automation is the use of substrate moisture sensors to trigger irrigation. These sensors are relatively inexpensive and, when used, can conserve water and, consequently, reduce pollution and the amount of money spent on electricity for pumps in wells. A

Hydroponics Give Growers Control

The term hydroponics describes soilless cropping systems that rely on water to transport the necessary nutrients to plant roots. The main difference between hydroponics and soil-based growing systems is the lack of a buffering capacity for nutrients.Typically for hydroponics, a small amount of inert rooting medium is used to anchor the first roots immediately after