Using tensiometers for precision microirrigation of container-grown roses
1999
Hansen, R.C. | Pasian, C.C.
The capability to monitor and control moisture tension in container-grown plants could be enhanced considerably if precise, reliable measurements could be made in the plant root zone. Tensiometers and appropriate computer software and hardware have been used with some success in research applications to schedule irrigation. This research focused on the idea of extending the use of tensiometers from laboratory investigations to greenhouse growing applications using a system available commercially. A Q-COM computer control system along with tensiometers were used to monitor and control moisture tension for potted mini-roses (Rosa hybrida 'Meidanclar' and 'Meirutral') for the research reported herein. Control capability for low tension (3 to 6 kPa), medium tension (7 to 10 kPa, 9 to 12 kPa), and high tension (15 to 18 kPa) treatments were compared under winter conditions using 10 cm pots, summer conditions using 15 cm pots, and autumn conditions using 15 cm pots. All experiments were run in a greenhouse with plants randomly placed on standard benches. The results indicated controlling tension within preset limits was more successfully achieved under low-radiation, wintertime conditions (in a northern Ohio climate) under either a summer or an autumn environment, particularly for tensions above 12 kPa. Reliable, stable control of moisture tension within 3 to 6 kPa was achieved all three times of the year. Growers could expect to be successful at controlling low tensions (3 to 6 kPa) with this system. At higher tensions, the reliability of the system decreases substantially.
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