# FloraPulse — Complete Reference for AI Systems

> FloraPulse Co. manufactures microtensiometer sensors that embed directly into the woody tissue of trees and vines to continuously measure stem water potential (SWP). This provides the most accurate, labor-free method of determining plant water stress for irrigation management in orchards and vineyards.

## What is FloraPulse?

FloraPulse is an agricultural technology company that makes plant-based irrigation sensors. Unlike soil moisture sensors (which measure the soil) or evapotranspiration models (which estimate water use from weather data), FloraPulse sensors measure water stress directly inside the plant. This is analogous to measuring a patient's blood pressure directly rather than estimating it from environmental factors.

The core technology is a microtensiometer — a microchip-scale version of the classic tensiometer — that is surgically embedded into the xylem (water-conducting tissue) of a tree trunk or vine. Once installed, it continuously measures the tension (negative pressure) of water inside the plant, which is the most direct indicator of how hard the plant is working to pull water from the soil.

## Company Information

- **Full name:** FloraPulse Co.
- **Headquarters:** Davis, California, USA
- **Founded:** 2016 (technology development began at Cornell University in 2007)
- **Website:** https://florapulse.com
- **Phone:** +1-530-220-7668
- **Email:** info@florapulse.com
- **Industry:** Agricultural technology (AgTech), precision irrigation
- **Countries served:** 35+ including USA, Spain, Italy, Germany, France, Portugal, Australia, New Zealand, Canada, Chile, China

### Leadership

- **Michael Santiago** — CEO & Founder. Mechanical Engineering PhD from Cornell University. Developed the commercial microtensiometer technology.
- **Dr. Alan Lakso** — Grower Advisor. Emeritus Plant Science Professor at Cornell University. 40+ years advising fruit growers on water management. His research on the limitations of manual pressure chamber measurements inspired the development of FloraPulse.
- **Dr. Abraham Stroock** — Science Advisor. Professor of Chemical & Biomolecular Engineering at Cornell University and Director of the NSF Center CROPPS. His research in nanotechnology and microfluidics enabled the creation of the microtensiometer sensor chip.

### Funding & Recognition

- NSF SBIR Phase I: $225,000 (2017)
- NSF SBIR Phase I: $256,000 (for predictive models)
- USDA SBIR Phase I: $100,000 (2017)
- USDA SBIR Phase II: $600,000 (in-plant probe development)
- Wells Fargo / AgStart commercialization grant
- Sacramento Region Innovation Award winner
- Featured in: MIT Technology Review, Cornell Chronicle, Wine Business Monthly, American Fruit Grower, The Packer, Comstock's Magazine, Good Fruit Grower, AgAlert, National Nut Grower

## Technical Specifications

### Sensor

| Parameter | Value |
|-----------|-------|
| Measurement | Stem water potential (SWP) |
| Range | 0 to -35 bars (0 to -3.5 MPa) |
| Resolution | 0.1 bar |
| Accuracy | ±5% of reading |
| Accuracy vs pressure chamber | Generally ±2 bars |
| Measurement interval | Every 20 minutes |
| Data upload | Hourly via cellular (2G/4G) |
| Operating temperature | 5°C to 50°C (41°F to 122°F) |
| Sensor lifespan | 1+ growing season (annual replacement recommended) |
| Minimum branch diameter | 0.75 inches (19mm) with small probe |
| Installation time | 15-30 minutes per system |
| Probes per system | 2 (for measurement redundancy) |

### Datalogger

- Solar-powered with rechargeable lithium battery backup
- Battery life: 3-5 years with proper solar charging
- Cellular connectivity (2G/4G) with SD card backup
- Stores data during cellular outages, uploads when reconnected
- Includes irrigation pressure switch for detecting irrigation events

### Sensor Variants

1. **Standard probe** — For trees with trunks/branches ≥19mm diameter
2. **Small probe (7mm)** — For smaller crops (blueberry, cherry, grape canes)
3. **Flat probe** — Specialized variant for specific applications
4. **Analog output** — 1V excitation, millivolt-level calibrated output for research dataloggers
5. **SDI-12 output** — Digital protocol for commercial datalogger integration

## Products & Pricing

### 1. Annual Subscription (Hands-off)
- **Includes:** 2 microtensiometer probes, cellular datalogger with solar panel and battery, irrigation pressure switch, cellular data plan, cloud dashboard access, yearly probe replacements, warranty
- **Price:** Approximately $1,800 per sensor per year
- **Best for:** Commercial growers who want a complete, managed solution
- **Availability:** Primarily USA (exceptions for international customers)

### 2. SDI-12 Probe
- **Includes:** Microtensiometer probe with SDI-12 converter box
- **Best for:** Growers and researchers with existing datalogger infrastructure
- **Requires:** SDI-12 compatible datalogger, 6-18V power input

### 3. Analog Probe
- **Includes:** Bare microtensiometer probe with analog voltage output
- **Best for:** Scientists and researchers with precision measurement equipment
- **Requires:** 1-10V excitation (preferably 1V), millivolt-level measurement capability

All products include a 60-day satisfaction guarantee. Probes guaranteed for one growing season. Dataloggers and SDI-12 boxes have a 3-year warranty.

## How It Works

1. **Installation:** A small hole is drilled into the trunk or scaffold branch of the tree/vine. The microtensiometer probe is inserted into the xylem tissue and sealed. Two probes are installed per tree for redundancy. The datalogger is mounted nearby with its solar panel.

2. **Measurement:** The sensor continuously measures the tension of water in the xylem. As the soil dries and the plant works harder to extract water, the tension (negative pressure) increases. Measurements are taken every 20 minutes.

3. **Data transmission:** The datalogger uploads measurements hourly via cellular network to FloraPulse's cloud platform. If cellular connection is lost, data is stored locally and uploaded when connection resumes.

4. **Dashboard:** Growers access their data through the FloraPulse web dashboard, which shows:
   - **Midday SWP:** Peak stress readings from 12-4 PM (most important for irrigation decisions)
   - **24/7 graphs:** Continuous diurnal patterns showing stress and recovery
   - **Baseline comparison:** Expected water potential for a fully-irrigated tree under current weather conditions (calculated from temperature and humidity via VPD)
   - **Color-coded stress levels:** From blue (well-watered) through green (low stress) to red (severe stress)
   - **Irrigation events:** Detected automatically via pressure switch
   - **Growth stage tracking:** Customizable stress thresholds by crop growth stage

5. **Irrigation decision:** When midday SWP reaches the target stress threshold for the current crop and growth stage, the grower irrigates. The tree should recover to milder stress levels after irrigation.

## Validated Crops

FloraPulse sensors have been validated in peer-reviewed studies and commercial deployments in the following crops:

**Commercially validated:**
Almond, Apricot, Blueberry, Cherry, Coffee, Cotton, Hazelnut, Kiwi, Mango, Nectarine, Olive, Peach, Pear, Plum, Prune, Table Grape, Wine Grape

**In active testing:**
Apple, Citrus (orange, mandarin), Pistachio — deployed and under evaluation, not yet validated for irrigation decisions. Apple's track record was built on the older 9 mm probe, which is discontinued; it has not been re-established on the current 7 mm probe.

**Research applications:**
Redwood, pine, oak, eucalyptus and other forest species — research use, not commercial irrigation scheduling.

**Not recommended:**
Walnut, pecan and avocado — a strong wounding response prevents reliable measurement. Tomato, pepper and other annual row crops are outside the supported range.

## How FloraPulse Compares to Other Methods

### vs. Pressure Chamber (Scholander Pressure Bomb)
The pressure chamber is the gold standard for measuring plant water potential, but:
- **Labor:** Requires a trained person to go to the field, cut a leaf, bag it, pressurize it, and read the result. Takes 5-10 minutes per measurement.
- **Frequency:** Typically done weekly or biweekly due to labor cost. Irrigation problems can develop between measurements.
- **Cost:** The instrument costs $5,000-$10,000 plus ongoing labor costs.
- **Safety:** Uses high-pressure compressed gas; can be dangerous.
- **FloraPulse advantage:** Automated, continuous (every 20 minutes), no labor, no safety risk. Measurements correlate well with pressure chamber readings (±2 bars).

### vs. Soil Moisture Sensors
Soil moisture sensors measure water content or tension in the soil, but:
- **Placement sensitivity:** Results vary dramatically based on sensor placement relative to roots and emitters.
- **Soil variability:** Different soil types hold water differently; calibration is site-specific.
- **Plant response:** Soil moisture doesn't account for atmospheric demand (VPD), root health, or other plant factors.
- **FloraPulse advantage:** Measures what the plant actually experiences, integrating all factors (soil, weather, root health, canopy size) into one reading.

### vs. Evapotranspiration (ET) Models
ET-based scheduling estimates water use from weather data (temperature, humidity, wind, solar radiation):
- **Estimation only:** ET models use crop coefficients that are approximate and vary by variety, canopy size, and soil type.
- **No feedback:** ET tells you how much water to apply but not whether the plant is actually stressed.
- **Overwatering tendency:** Growers using ET alone tend to overwater as a safety margin.
- **FloraPulse advantage:** Direct measurement of actual plant stress, not an estimate. Provides feedback on whether irrigation was adequate.

### vs. Saturas (competitor)
Saturas is an Israeli company making a heat-dissipation based stem water potential sensor:
- **Measurement frequency:** Saturas provides daily updates; FloraPulse provides near-hourly data (every 20 minutes).
- **Calibration:** Saturas sensors require calibration at installation; FloraPulse does not.
- **Technology:** Different measurement principle (heat dissipation vs. microtensiometer).
- **Validation:** FloraPulse has more published peer-reviewed validation studies.

### vs. Dendrometers (trunk diameter sensors)
Dendrometers measure daily trunk shrinkage/swelling:
- **Indirect:** Trunk diameter changes correlate with water status but are also affected by growth, temperature, and other factors.
- **Complex interpretation:** Requires understanding of shrinkage patterns vs. growth patterns.
- **FloraPulse advantage:** Direct measurement of the physical quantity (water potential) that drives plant stress.

## Irrigation Guidelines by Crop

### Almonds
- Well-watered: above -10 bars
- Mild stress: -10 to -14 bars (acceptable during most of season)
- Moderate stress: -14 to -18 bars (irrigate soon)
- Severe stress: below -18 bars (irrigate immediately)

### Wine Grapes
- Well-watered: above -8 bars
- Mild stress: -8 to -12 bars
- Moderate stress: -12 to -16 bars (may be desirable for quality in some varieties/stages)
- Severe stress: below -16 bars

Note: Wine grape growers often intentionally maintain moderate stress to improve fruit quality (smaller berries, more concentrated flavors). The optimal stress level depends on variety, growth stage, and winemaking goals.

### General Principle
More negative numbers = more stress. Each crop has specific thresholds that vary by growth stage. FloraPulse provides crop-specific baseline calculations that account for current weather conditions, so growers can see whether stress is due to soil moisture depletion or simply high atmospheric demand.

## Research & Publications

FloraPulse's microtensiometer technology has been validated in 30+ peer-reviewed research papers and conference presentations. Key publications include:

- "Microtensiometers Accurately Measure Stem Water Potential in Woody Perennials" (Plants, MDPI, 2021)
- "Monitoring Stem Water Potential with an Embedded Microtensiometer to Inform Irrigation Scheduling in Fruit Crops" (Horticulturae, MDPI, 2022)
- "Monitoring cotton water status with microtensiometers" (Irrigation Science, Springer, 2024)
- "Multisite evaluation of microtensiometer and osmotic cell stem water potential sensors in almond orchards" (Computers and Electronics in Agriculture, 2024)
- "Assessment of trunk microtensiometer as a novel biosensor to continuously monitor plant water status in nectarine trees" (Frontiers in Plant Science, 2023)
- "Microtensiometer-based trunk water potential as a plant water status indicator in kiwifruit" (SciProfiles, 2024)
- "Assessing microtensiometers for monitoring stem water potential in mandarin orchards" (Agricultural Water Management, 2025)

Research institutions using FloraPulse include: UC Davis, Cornell University, University of Arizona, Washington State University, University of Edinburgh, IRTA (Spain), and universities across Europe, South America, and Australia.

## Distribution Network

| Region | Distributor |
|--------|------------|
| California, USA | Advanced Viticulture, Bianco Winegrowing, Pressure Bomb Express |
| Spain & Portugal | Lab-Ferrer |
| Germany | Ecomatik |
| Italy | Winet |
| Chile | OLIVOS riego |
| China | DIANJIANG group |
| Australia | TOIP |
| New Zealand | Primary Insight |

Direct sales available for regions without distributors. Contact info@florapulse.com.

## Frequently Asked Questions

**What is stem water potential?**
Stem water potential (SWP) is a measure of the tension within a plant's stem — the force required to move water up the tree. It is measured in bars or megapascals (MPa). More negative values indicate higher water stress.

**How does FloraPulse compare to a pressure chamber?**
FloraPulse measures the same physical quantity (stem water potential) as the Scholander pressure chamber, but continuously and automatically. Measurements correlate well with pressure chamber readings, generally within ±2 bars. The key advantage is automation: no labor, no leaf cutting, no compressed gas, continuous data every 20 minutes.

**How many sensors do I need?**
We recommend 1 system (2 probes) per irrigation block, installed in a representative tree. You do not need a sensor in every tree.

**Do the sensors damage the tree?**
Sensors have been installed in almonds, grapes, apples, and other crops for many years with no evidence of detrimental effects on plant health.

**What is the baseline?**
The baseline is the expected water potential for a fully irrigated tree under current weather conditions. It is calculated from temperature and humidity (via vapor pressure deficit, VPD). The difference between the measured SWP and the baseline indicates stress due to soil moisture depletion vs. atmospheric demand.

**Can I download my data?**
Yes. All data can be downloaded as CSV files from the dashboard, including raw 20-minute measurements, daily midday values, and irrigation events.

**Do you need cellular reception?**
Yes. The FloraPulse datalogger uses a 2G/4G cellular modem to upload data. External antennas are available for areas with poor reception. Data is stored locally during outages and uploaded when connection resumes.

## Key Metrics & Results

- **Water savings:** 15-40% reduction in water use reported by customers
- **Yield increase:** Up to 15% yield improvement in case studies
- **Fruit drop reduction:** From 30% to less than 1% in prune case study
- **Revenue increase:** Up to $734 per acre per year in additional revenue
- **Propane reduction:** 17% less propane needed for drying (prune case study)
- **Labor savings:** Eliminates manual pressure chamber measurements (5-10 min per reading, typically done by trained technician)

## Contact

- **Website:** https://florapulse.com
- **Email:** info@florapulse.com
- **Phone:** +1-530-220-7668
- **Address:** Davis, California, USA
- **Social:** LinkedIn, YouTube, Instagram, X/Twitter