Tensiometer-based irrigation for nursery and greenhouse plant production

7/13/98


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Table of Contents

Tensiometer-based irrigation for nursery and greenhouse plant production

Research on tensiometer-based irrigation of potted plants

Tensiometer

Tensiometer-based Irrigation System Design

Tensiometer-based Irrigation System Design

Typical setup in commercial greenhouses

Typical setup in commercial greenhouses

Typical setup in commercial greenhouses

Results

Results

Results

Potted Plant Irrigation Experiment Summary Irrigation solution (ml/pot) applied per day

What we have learned

What we have learned

What we have learned

What we have learned

What we have learned: ...if you do have automation (e.g. solenoid valves, timers, etc)

The Moisture Release Curve

Note wetting/drying trajectory

Note how plants “feel” about various levels of moisture

How humans perceive various levels of moisture.

How humans perceive various levels of moisture. Note: it’s already sub-optimal although substrate still feels moist !

Horticultural implication:

Cut-flower Rose Irrigation Research Objectives

Modification of tensiometers for use in irrigation control with in-ground roses:

PPT Slide

PPT Slide

PPT Slide

Experimental setup

Tensiometer-based irrigation system: in-ground roses

Tensiometer-based irrigation

PPT Slide

Summary of water use during the trial:

Production and water use

Production and water use

Production and water use

Follow-up experiment

Tensiometer-based irrigation in Roses Summary

PPT Slide

Author: Heiner Lieth

Email: jhlieth@ucdavis.edu

Home Page: http://Lieth.ucdavis.edu