Automatic Root Dendrometer

Agricultural Electronics Corporation Home Page

The automatic root dendrometer can measure changes in the outer surface of a root with respect to the fixed inner root xylem. Root radial surface changes can be measured up to thirteen centimeters below ground level to a resolution of five micrometers. The range of the dendrometer is thirteen millimeters. Measurements can be made once per minute up to once per day.

The dendrometer consists of a fiberglass impregnated epoxy platform (G10) mounted just above the ground surface. The rectangular platform is attached to the root xylem by means of four stainless steel threaded rods. Dimensions of the platform are two by five by nineteen centimeters. A circular sensing rod protrudes out of the bottom of the platform and extends vertically downward into the soil until it impinges on the surface of the root. The above ground end of the sensing rod is attached to a linear variable differential transformer (LVDT) mounted on top of the platform. The LVDT converts changes in sensing rod displacement to changes in an electrical signal which are processed and stored in electronics attached to the dendrometer. A constant vertical force is exerted on the sensing rod by means of a brass disk.

Web Site Navigation Links
Welcome Page  
PHYTOGRAM™ - Applications and specifications Automatic Point and Band Dendrometers - For precise measurements of growth
POD - In-the-field solar powered data collection computer operating over extended period of time in various environmental conditions Manual Band Dendrometers - Schematic drawing and product characteristics
Equipment Cost and Support Services - Products, Services, and typical Research Packages Automatic Root Dendrometers - For measurement of diurnal cycles and growth rates of roots near the surface.
Ontogenetic Irrigation Scheduling- When to water and how much to water based on plant development over four seasons Dendrometer User Group Pages
Data Transfer Methods - Various alternatives- primarily cell phone and radio communication capabilities  
Water Content Levels of Wine Berries- for wine industry, using the Phytogram™ for indicator of hydration status and berry ripeness  
Environmental Sensors - For concurrent assays of air and ground temperature, light, and soil moisture Communicating with Agricultural Electronics Corporation - By E-mail, US Postal Service, Telephone and Fax
End of Page