Deepfield® Connect - Asparagus Monitoring

Product description

Why Deepfield® Connect - Asparagus Monitoring?

Asparagus grows best at 18 to 22°C. In a warmer environment the asparagus stalks get hollow and ridged and the spear heads open too early. Such asparagus is hard to sell. The losses can be as high as 30% of the total harvest.

Picture 1: Influence of the mound temperature on the quality of the asparagus according to [1]. Spears with open heads: Grolim 2002. Grade I: Gijnlim 2002.

In a colder environment asparagus grows slowly. The temperature in the mound can be controlled using a two-colored cover. If the black side of the cover is turned towards the sun the mound is heating up, with the white side up the mound is cooling down. But it is necessary to know the set point temperature in order to control it correctly. For this purpose a single measurement a day isn’t sufficient. Instead it is essential to know the average temperature, aggregated by several measurements taken intraday at the same spot. Every day. Now there is a solution for this purpose: Deepfield® Connect - Asparagus Monitoring.

Does it pay off for me?

The high positive correlation between temperature control of the asparagus mound and a high yield share of grade I asparagus was proved by a field trial realized by the “Verband süddeutscher Spargel- und Erdbeeranbauer e.V.” under the direction of Ludger Aldenhoff in 2003 [2]. The following rough amortization calculation is based on the results of this field trial.

Assumed net yield   5000 kg/ha
Increased losses due to hollow spears 2,5% 125 kg/ha
Increased losses due to blown spears 5% 250 kg/ha
Deduction due to hollow spears   4 €/kg
Deduction due to blown spears   2 €/kg
Losses due to hollow spears   500 €/ha
Losses due to blown spears   500 €/ha
Total losses* 1000 €/ha
Final deductions (e.g. clippings) 25% 250 €/ha
Avoidable losses   750 €/ha
Cost per sensor per year   319

Table 1: Losses due to hollow and blown spears according to [2]

*Take note: Further losses such as due to burned spear heads are not taken into account.

Your benefits:

  • Quality and profit rise due to accurate temperature measurements inside the mound
  • Calculation of the important daily average temperatures in the mound
  • The optimal start of the harvest is estimated by accumulation temperature measurements
  • No manual measurements
  • Understand your fields better by the data you gain
  • You can share your data with your consultant

How does Asparagus Monitoring work?

Deepfield® Connect - Asparagus Monitoring measures the ground temperature using a high precision temperature sensor, which is installed inside the mound, see picture 2. This sensor measures the temperature at different height levels: Directly below the cover as well as 5, 20 and 40 cm below it. The system records the temperatures and sends them to a BOSCH operated webserver. This server provides 24/4 access to the data through Smartphone and Tablet apps, enabling you to take the right decisions. Access to the data can also be shared with employees or consultants.

Picture 2: functionality of “Deepfield® Connect - Asparagus Monitoring”

The temperature history can be viewed and studied. In addition a warning function is provided, which can trigger an alert if a user defined temperature threshold is violated. These thresholds can be set individually for all four measurement depths. Furthermore Deepfield® Connect - Asparagus Monitoring shows accumulated temperatures aiding the customer to estimate the best point in time for the harvest. Harvest should be carried out when the accumulated temperature measured 20 cm below the cover reaches about 500 °C (according to Joachim Ziegler, DLR Rheinpfalz).

For clarification of the above described functions some app screenshots with example data are provided.


  • On the field overview view the temperature data of all installed sensors is provided at a glance. Furthermore the values at 6 p.m. or 24h averages can be displayed.

  • The detail view of one field shows the temperatures of the selected sensor. Furthermore the values at 6 p.m., 24h averages or a two day weather forecast can be displayed.

  • The history view presents all measurements for the last day, week or month.

  • The temperature sums view presents the accumulated temperatures of all sensors.

  • Temperature thresholds can be set for each installed sensor, enabling early alerts in case of temperatures exceeding limits.

  • The alarm overview view presents all user defined thresholds for the installed systems.

  • The battery status and cellular signal quality for all sensors can be observed in the field overview screen.

  • For better communication access to all measurement data can be shared using any of the installed communication apps on the smartphone or tablet. This way for example friends, colleagues, employees or consultants can access the data.


How can I get Asparagus Monitoring?

You can rent Deepfield® Connect - Asparagus Monitoring in our webshop.

The annual service charge for each Deepfield® Connect - Asparagus Monitoring unit is 319,- EUR plus VAT. Each unit consists of a Deepfield® Gateway, a Deepfield® ST4 sensor and the Deepfield® App.

Costs such as for cellular data, service charges for the app or replacement systems in case of malfunction are covered by the annual service charge. The battery of the unit is designed for six years of operation and is monitored by BOSCH Deepfield® Robotics. Once the battery is empty a new Deepfield® Gateway is shipped to you and you’re requested to send back the old one.

How can I install Asparagus Monitoring?

Deepfield® Connect - Asparagus Monitoring can be installed very easily by following these four steps:

1. Download and install the app
2. Activate the sensor systems within the app using the imprinted serial numbers
3. Connect the sensor cable with the gateway unit
4. Plunge the sensor rod centrally into the mound

After completing these steps the system is installed and activated and starts collecting data every hour. In order for this data to be transmitted Deepfield® Connect - Asparagus Monitoring requires a cellular data connection. That is a prerequisite for the usage of the system.


[1] Schreiner, M., Schmidt, S. und I. Schonhof: Beeinflussung des Ertragsverlaufes, des Ertrages und der Qualität vom Bleichspargel über gezielte Steuerung der Dammtemperatur. In: Spargelproduktion optimieren. KTBL-Schrift 450, S. 9-21. Darmstadt 2007.
[2] Aldenhoff, L., BDSE e.V.: Automatische Temperaturübermittlung aus den Spargeldämmen. DLG Feldtage 16.06.2016, Haßfurt.