New PDF release: Alley Farming (The Tropical Agriculturalist)

By B.T. Kang, A.N. Atta-Krah, L. Reynolds

ISBN-10: 0333600800

ISBN-13: 9780333600801

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Infrared thermometry is based on the principle that leaf temperature is related to a plant’s transpiration rate. Infrared satellite imagery to detect crop stress is under research. Remote sensing systems use buried sensors wired to a nearby transmitter that radios sensor readings to a receiver, typically a data logger connected to a computer. These systems allow large farms to monitor several fields simultaneously from a single computer. Tips on Placing Moisture Sensors and Interpreting Readings The key to soil moisture monitoring is choosing reliable tools and installing sensors in representative monitoring locations.

If no CIMIS information is available for your location, or if you want to check published estimates, you might consider taking matters into your own hands. Weather station prices start around $1,000 and go up to several thousand dollars. Software and a way to download information may cost extra. Weather stations also need to be maintained and calibrated periodically for accuracy. Atmometers, also known as evaporimeters or ET gauges, are flat, porous ceramic disks that draw up water as evaporation dries the surface of the disk.

So be careful to minimize soil compaction and disturbance to the surrounding soil and canopy cover. Electrical resistance blocks may be read either with a data logger (next section) or with a portable hand-held meter. These meters, costing $150 to $600, generally either show the electrical resistance reading from the sensor in ohms or else convert resistance to centibars. A hand-held meter is especially useful where you want to check moisture at numerous sites. 49 Data Loggers Soil moisture data loggers are typically battery-operated devices, hard-wired to buried electrical resistance block sensors.

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Alley Farming (The Tropical Agriculturalist) by B.T. Kang, A.N. Atta-Krah, L. Reynolds


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