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Summary of Contents for SpectraCrop Plant Vitality and P-Tester
- Page 1 User Manual for SpectraCrop Plant Vitality and P-Tester...
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Page 2: Table Of Contents
Table of Content 1. Terms and Conditions ................3 2. Introduction ................... 4 3. SpectraCrop Plant Vitality and P-Tester ..........6 3.1 Flow Chart ..................6 4. How to Perform a Measurement ............8 5. The SpectraCrop App ................10 5.1 New .................... -
Page 3: Terms And Conditions
2. Data obtained by the P-tester are automatically stored on a server owned by SpectraCrop. To aid in future development and upgrades of hardware and algorithms, users agree that all collected data are available to SpectraCrop. Data will not be handed over to any third- party by SpectraCrop. -
Page 4: Introduction
2. Introduction Congratulations on your new Plant Vitality and P-Tester from SpectraCrop. With the P-tester, you can perform measurements on plants directly in the field, and in seconds determine whether the P nutritional status is adequate. The handheld device transmits the readings directly to your smartphone (iPhone). - Page 5 photosynthesis are affected, and so in-turn is the OJIP curve. Identifying this effect in the OJIP curve is what allows the P-tester to specifically, and sensitively, measure the nutritional P-status of a plant. In Figure 1B the fluorescence transient of a healthy control plant and a P deficient plant is illustrated.
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Page 6: Spectracrop Plant Vitality And P-Tester
3. SpectraCrop Plant Vitality and P-Tester The SpectraCrop Plant Vitality and P-Tester is accompanied with a handy suitcase which includes the following items: Handheld P-tester, 10 leaf clips to dark adapt leaves prior to measurements and 1 power plug (EC standard; Figure 2). - Page 7 Figure 3: Flow chart of the use of the P-tester. Bluetooth connection ensures transfer of the measurements to the SpectraCrop app, whereas the phone must send and receive data to obtain the P-diagnose from the external server.
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Page 8: How To Perform A Measurement
“measure” on the P-tester. The measurement will take 3 seconds (Figure 5). You can remove the leaf clip when “measuring” is no longer displayed. The measurement is saved on the P-tester until it is transferred to the SpectraCrop app. - Page 9 Figure 5: The P-tester attached to a leaf clip and ready for measurement. It is critical that the shutter is not opened before a tight fit between the device and the clip is obtained.
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Page 10: The Spectracrop App
When opening the app, you will see four main menu-items along the bottom of the screen: “New”, “List”, “Map”, and “User” (Figure 6). Figure 6: Left: SpectraCrop app from Apple App store. Right: The appearance of the app including the 4 menus at the bottom. 5.1 New In the “New”... - Page 11 Figure 7: Left: The appearance when Bluetooth connection is not established. Right: After establishment of Bluetooth connection. Five actions are made available after Bluetooth connection: Automatic readings: If the “Start” button is pressed under automatic readings, the app will transfer any reading from the P-tester every 10 seconds until stopped (Figure 8). When a reading is transferred it will be notified on the app.
- Page 12 Figure 8: Left: Screenshot when the app is set for automatic reading. Middle: Screenshot when the app is transferring a reading. Right: Screenshot after the reading has been transferred. Note that the automatic reading is still in progress. New reading: If you don’t want to transfer your readings continuously, or you don’t have the phone near you when measuring, you can transfer your readings manually by pressing the “Transfer readings”...
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Page 13: List
Reset current connection with device: If the connection is unstable you can press “Reconnect”, to re-establish Bluetooth connection with the P-tester. 5.2 List In the “List” menu, all the transferred readings are listed and ready for inspection. Two plant vitality parameters are immediately available: Photosynthetic efficiency (PE) and plant vitality- index (PI), including two additional parameters describing the fluorescence transient: Baseline fluorescence (F0) and time for reaching maximum fluorescence (T Fm). - Page 14 Photosynthetic efficiency (PE): This parameter is one of two important plant vitality parameters. In a non-stressed plant, regardless of plant species, the value of PE ranges between 0.75-0.85. If the value is less than 0.75, it reveals that the light is not used optimally in photosynthesis and plant growth is weakened as a result.
- Page 15 unreliable for a P diagnosis. If T Fm is above 700, the P diagnose will not be performed, as it might not reflect the true P concentration in the leaf. P diagnosis: To obtain a diagnosis of the P nutritional status, the readings need to be transferred to an external server via the app (see more under the “user”...
- Page 16 performed. Instead, the leaf colour will turn purple to indicate that a bad measurement has been performed (Figure 11). Figure 11: Both PE and T Fm are off limit and highlighted in red. This implies a bad measurement, and the leaf colour turns purple, meaning that the P diagnose cannot be performed.
- Page 17 Figure 12: Screenshot of the Kautksy curve off three different readings with corresponding P diagnose. Note the difference at the I- step which corresponds to the three different P diagnoses. Handling of data: You can mark individual readings by ticking the square box to the left of each reading.
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Page 18: Map
Figure 13: Screenshots to sort data (left) or perform different actions with the marked readings (right). 5.3 Map In the “Map” menu, the readings appear based on their associated GPS coordinates, including the colour code from the P diagnose (Figure 14). This gives a quick overview of potential local variations in the P availability. -
Page 19: User
Figure 14: Screenshot of seven readings plotted on a map by their GPS recording. The map-function reveals a potential P problem in the corner of the field. 5.4 User In the “User” menu, you can get access to the server and synchronize your readings to obtain the P diagnosis. - Page 20 Figure 15: Left: Screenshot of the ”User” menu. As a first time user, you need to create a user before you have access to the server. Middle: Screenshot when you have logged. Right: Screenshot when the synchronization is completed.
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Page 21: How To Use The P-Tester
The SpectraCrop P-model is optimized for measurements on the youngest fully developed leaf, and we therefore recommend using that leaf when measuring.
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