Author: Mary Kuzmenko

CEO Petiole
I like to grow plants and ideas
Regularly read

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.

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On 18 October 2017, the Faculty of Chemistry and Biology of the Ternopil National Pedagogical University (TNPU) hosted a one-day interdisciplinary workshop on the theme of “Intellectual Information Technologies in Education and Science”. The workshop was designed to transfer knowledge and provide a new model for high‐quality, open interdisciplinary engagement between professionals in biology, informational technology and education.

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Petiole is everywhere

Posted by September 25, 2017

To download Petiole and try it for your leaves – go to this link.

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Plumeria Rubra / Wikipedia

Plumeria Rubra / Wikipedia

Leaf area (LA) is an important parameter in many plant modeling studies.There is a need for a simple, accurate and non-destructive model to predict LA in physiological experiments in which destructive LA sampling is not allowed (e.g., rare plants or genetically segregating populations). In this study, a model for LA estimation was developed for Plumeria rubra L. using simple linear measurements of leaf length (L) and maximum width (W). Two experiments were carried out, one in 2012 (on seven commercial genotypes: ‘California Sunset’, ‘Christina’, ‘Elsie’, ‘Gina’, ‘J.J. Mini White’, ‘Panittas Red’, and ‘Pixie Dust’) and one in 2013 (on one genotype ‘Divine’) under greenhouse conditions, to test whether a model could be developed to estimate LAs of P. rubra across genotypes. Regression analysis of LA vs. L and/or W revealed several models that could be used to estimate the area of individual Plumeria leaves.To develop a model to estimate individual LA values accurately for all genotypes of P.

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It was interesting and challenging way but we have gone it. Finally, we have completely new Petiole.LeafArea, an Android based mobile application for biology, plant physiology, agriculture chemistry and ecology. We re-write it from scratch. Now Petiole measures not only the specific leaf area of an individual plant leaf but can measure total leaf area. Petiole will help to measure specific leaf area and total plant leaf area in taps, without any ImageJ or leaf area scanners.

Also, this version includes behind the scenes improvements to Petiole app stability and stamps of our pesky bugs.

By the way, our Petiole.LeafArea is absolutely FREE now. Don’t forget to take advantage of this.

If you will have any problems with Petiole.LeafArea, please, don’t hesitate to contact us via the app, directly at or you can visit our FAQ and find some answers there:

Download Petiole. Leaf Area from Google Play Store

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The atmospheric [CO2] in which crops grow today is greater than at any point in their domestication history and represents an opportunity for positive effects on seed yield that can counteract the negative effects of greater heat and drought this century. In order to maximize yields under future atmospheric [CO2], we need to identify and study crop cultivars that respond most favorably to elevated [CO2] and understand the mechanisms contributing to their responsiveness. Soybean (Glycine max Merr.) is a widely grown oilseed crop and shows genetic variation in response to elevated [CO2].

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Leaf area measurement with creative resources

Leaf area measurement with creative resources

Trees in big cities are adopted for the surrounded conditions more than the same species of wood put down their roots in the natural conditions. In other words, we are speaking again about influence of salt-affected soil, metal heavy, gases, etc.

Level of development for a tree was defined by the degree of its organs’ development, particularly leaves. We researched differences between the natural territory, for example, parks, green areas – the leaves were larger and contain less heavy metals there. Instead, leaves grown in the streets were not so.
We measured individual surface area. For this task we scanned leaves, put images into a PC software, it calculates shaded pixels, then these pixels were transferred to the area and this process took a lot of time.
By the way, we used unlicensed program. It seemed that it worked, brought some results but we cannot prove them and think that these results were accurate.

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Hello to all readers of Geektimes. Today we have a chance to chat about real development of own ideas with Andrii Seleznov, co-founder of startup Petiole. We will try to avoid winning relations and suggestions how it is easy (or difficult) and enjoyable to feel media exposure on yourself. 

Instead of this, we want to write about quite a lengthy process: about how a new idea is emerging, about theoretical underpinning of author(s) knowledge, about how an idea gains its meaningful characters, and foremost, how it appears and  imposes the auditory. We mean the honest story about finding investors and further development.

We would like to avoid any advertisements but should say a couple of words. What is meant here is technically special-purpose application Petiole, that allows measuring leaf area of plants and chlorophyll content with the help of a camera of a mobile phone.

Let’s start from the very first jump.

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Measure leaves surface areas, save your measurements, see the comparison of leaves surface areas, and add experimental crops and fields
Source: Android description

Useful information
Download: Android 4.2 (3.4MB)
Price: free (there is a paid option)
Language: English
Runs offline: no
Last update: Android 15/03/2016
Website of the developer: Petiole


This application allows you to calculate in a simple way the surface area of the leaves (what is known as foliar area), an important variable for estimating plant growth or agricultural potential.

The use of the application requires opening a user account (if you only want to try it, you have a possibility to use a demo version). Once implemented this requirement, you access to a screen in which the leaves whose surface has been calculated previously are stored. To perform the measurement of a new leaf, Petiole will ask you first to install OpenCV Manager, a small application that, among other features, allows detection and object recognition.

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