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1 This presentation premiered at WaterSmart Innovations 2010 Join us this fall in Las Vegas, October, 2011 watersmartinnovations.com
2 The Agronomic Viability of Soil Moisture Sensors In the Landscape Jon Peters - Baseline Inc. jonp@baselinesystems.com World Leading Water Management Founded on Solid Agronomics
3 Eliminating or reducing water use in the landscape is easy. Reduce the irrigated area Reduce valve on time Shut the water off Many water restrictions are aimed at reducing landscape water use.
4 Eliminating or Reducing Landscape Overwatering (watering efficiently) Is not as easy Proper design and installation (Uniformity, Hydro Zones, Hydraulics, Flow Monitoring, Master Valves ) Water only when needed (When to turn on the sprinklers) How much water (When to shut off the sprinklers) Most water rebate and education programs are aimed at efficient use.
5 Why Soil Moisture Sensors? Easy to understand, (It works like a thermostat) Directly measuring the result is more accurate and reliable Capable of more than reducing water waste No regular maintenance, or service fees
6 Soil moisture content - Saturation- The soil pores are filled with water and nearly all of the air in the soil has been displaced by water Field Capacity- The level of soil moisture left in the soil after drainage of the gravitational water Maximum Allowed Depletion (MAD) - Desired soil moisture deficit at the time of irrigation. Permanent Wilt Point The minimal point of soil moisture the plant requires Oven Dry- When soil is dried in an oven, nearly all water is removed. This moisture content is used to provide a reference for measuring the other three soil moisture contents.
7 Volumetric Moisture Content The Basic Principals of Irrigation management- 50% 40% 30% 20% 10% Efficient irrigation comes down to two questions 1. When to start watering 2. When to stop watering Field Capacity MAD Permanent Wilt Stop Start Oven Dry Sand Loam Clay Chart for explanation purposes only
8 The Basic Principals of Irrigation management- Field Capacity MAD Stop Start Permanent Wilt Saturation
9 The Basic Principals of Irrigation Management- Field Capacity MAD Permanent Wilt
10 The Basic Principals of Irrigation Management- Field Capacity Stop MAD Start Permanent Wilt
11 The Basic Principals of Irrigation Management- Field Capacity Stop MAD Start Permanent Wilt
12 The Basic Principals of Irrigation Management- Field Capacity Stop MAD Start Permanent Wilt Oven Dry
13 The Basic Principals of Irrigation Management- -Two Basic Watering Strategies- Deep and Infrequent Optimize rooting depth (WUE) Can be used to deficit irrigate Optimize drought tolerant plant traits Maintain Moisture level or Schedule driven Manage restricted water windows, (sports fields, or municipal water restrictions) Maintain (often can produce a more lush appearance)
14 The Basic Principals of Irrigation Management- -Two Basic Watering Strategies- Field Capacity MAD Deep and Infrequent Stop Start
15 The Basic Principals of Irrigation Management- -Two Basic Watering Strategies- Field Capacity MAD Maintain Stop Start
16 Efficient Irrigation management - Deep and Infrequent Lower Threshold Maintain Upper Threshold
17 The Basic Principals of Irrigation Management- Deep and infrequent watering will ensure maximum plant water use efficiency (WUE)
18 The Basic Principals of Irrigation Management- -Two Basic Watering Strategies- (When Using a SMS) Deep and Infrequent Turn on based on soil moisture (low moisture) Turn off based on time Maintain Moisture level or Schedule driven Turn on based on time Shut off based on soil moisture (high moisture)
19 Efficient Irrigation management - In order to estimate the soil moisture it requires soil information, often the irrigator is given a choice; Sand, Sandy Loam, Loam, Clay Loam, Clay. USDA Textural Triangle psystems/components/3115s01.html#section1 ources/k_12/lessons/profile/
20 Efficient Irrigation management - What do we really want to know? Is the soil in the root zone wet or dry.
21 Efficient Irrigation management - In order to estimate the soil moisture it also requires plant information, often the irrigator is given a choice; Cool/Warm Season grass, Tree, Shrub... This information is used to estimate how rapidly a group of plants could remove water from the soil, if water is available to remove. Transpiration Rate Leaf Color Shape Size Texture Water use efficiency Roots Tap roots Fibrous roots Rhizomatous
22 Efficient Irrigation management - Transpiration Rate Leaf Color Shape Size Texture Water use efficiency Roots Tap roots Fibrous roots Rhizomatous What do we really want to know? Is the soil in the root zone wet or dry.
23 Our Mission ~ We intend to forever change the way people water plants by providing the smartest, easiest, and most capable irrigation control products ever made.
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