How to make reference to Petiole mobile application in scientific research

Recently we got a question from the customer of Petiole mobile application related to his need to refer to the app in his dissertation. He was doing research in agriculture science and needed to quote Petiole as an instrument of leaf area measurement.


Calibrate camera in Petiole not working – how to fix this?

We get many questions about fixing a problem of camera calibration at Petiole, a mobile application for specific leaf area measurement. That’s why we decided to suggest two general solutions for this issue.

Why I cannot calibrate camera in Petiole mobile application?

There are many reasons for this question. After some research, we have clarified three of them. These aspects tell us why people cannot use Petiole mobile application properly.

Our plant scientists face the problem with camera calibration in Petiole. This may be a result of:

  • An old version of Petiole mobile application or
  • A specific operating system of the smartphone or
  • Problem with the same height and fixed position for measurement.

Solution 1 – Software Updates

Actually, this is one of the most popular solution to the problem of how to calibrate camera in Petiole. You must go to the Petiole mobile application page at Google Play Market and check for any updates.

Honestly, we do our best to fix different problems.

Traditionally, they appear in the mobile application after every new release of OS Android or any its library. That’s why – try to update your mobile application manually if it is not automatic.

Solution 2 – Follow our step-by-step video instruction

We have produced a range of videos about calibration and the next steps of measurements. Hopefully, these materials will be helpful for you:

Step #1. Setup Calibration pad

Step #2. Then, setup Camera with Calibration pad

Step #3. Afterwards, place a leaf on the measuring stand


Step #4. Finally, measure leaf area in square centimetres. Just in one tap!

We hope these solutions will help you. If not – let us know, we will do our best to help you.

We know that there is a range of mobile phones with average productivity. As a result, this creates extra problems. It seems that Petiole does not work properly. We try to fix these problems too.

Please, stay calm. Hopefully, in the next release, we will solve the unique problem that you have.

Anyway, you can always ask an Android phone of your friend. Just to install this app.

Probability is higher that it will work on your friend’s phone.

Good luck with your work and research!


Happy Birthday, Petiole

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How to measure leaf area with smartphone?


In this video, we made a brief how-to measure leaf area with a smartphone and a mobile application Petiole. It clear shows that specific leaf area measurement is not a problem and even to measure total leaf area is not an issue – less than in a minute with nothing special. Only Petiole and its Petiole kit (measuring stand and calibration pad) and three leaves of the olive tree.

There are three main stages of leaf area measurement using a smartphone.

Petiole Plants

Evaluation Methods Of Estimation of Young Apple Trees Leaf Area

The analysis of the three measurement methods of leaf blade area of young bi-axis apple trees on rootstock 54-118 was made. High accuracy of the measurement results by a method of area calculation within a leaf contour on millimeter graph paper (31, 21 ) and with help of a method of computer sight using application “Petiole” on Smartphone with operational system Android (31, 28 ) was established. The gravimetric method and the use of mobile application “Petiole” appeared to be the most productive as to time consumption to carry out the operation.

Key words: leaf blade area, definition methods, computer sight, millimeter graph paper method, gravimetric method, “Petiole” application, bi-axis apple tree.

Authors: O. V. Polunina, Post-graduate Student, Uman National University of Horticulture (Uman), Ukraine
V. P. Maiboroda, PhD in Agricultural Sciences, Associate Professor, Uman National University of Horticulture (Uman), Ukraine
A. Y. Seleznov, Chief Technology Officer at Petiole LTD, Ukraine


Life Hack for Plant Science: How To Make Leaves Flat to Measure Leaf Area

Simple answers to really difficult practical questions in agriculture and ecology. Surely, with Petiole :).

If you have ever tried to measure leaf area of wheat, soybean or pear, share your experience with us! We suggest you can tell how “easy” it was to make the surface of leaves flat and not curvy. Considering our hands-on experience, it is almost impossible particularly in wheat and rice, on the early stage of vegetation!

There are many life hacks on how to glue these leaves or stick them. However, after such manipulations, these leaves are not acceptable for any other further measurements or research.

Hence, we found an elegant solution to this problem. It is applicable for almost any type of leaves (cereals, fruit or vegetables). It makes their surface completely flat and ready-to-measure. Do you want to try it :)?

How to make a surface of a leaf flat for measurement? Ask Petiole, we know how
How to make a surface of a leaf flat for measurement? Ask Petiole, we know-how

Petiole at Global Entrepreneurship Summit 2017

Namaste! We are terrifically delighted to be among participants of 2017 Global Entrepreneurship Summit in Hyderabad, India. This year’s Summit is highlight the theme Women First, Prosperity for All, and focuses on supporting women entrepreneurs and fostering economic growth globally.
Petiole is directly involved in STEM and making agriculture entrepreneurship closer to women worldwide. Hence, we are here to plan our next milestones :).
But now let’s listen to this beautiful lady (her name is Ivanka Tramp), make new global connections and discover endless opportunities in India.


Petiole for leaf area – new feature is coming

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Petiole at REAP 2017

Today we got a priceless opportunity to represent our project at REAP 2017, organized by Agri-Tech East. Maryna Kuzmenko, CEO Petiole, successfully completed this mission.


Effective leaf area measurement: a One-Day Workshop in Uman

A one-day workshop to practice the technique of leaf area measurement with Android mobile application Petiole was organized by the Department of Fruit and Viticulture of the Faculty of Fruit and Vegetables, Ecology and Plant Protection at Uman National University of Horticulture.

This is truly the scientific center of the modern agricultural education of Ukraine. Established in 1844, this University is one of the oldest universities in the country with solid experience of scientific research in horticulture.