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Leaf wetness wireless sensor: IoT in the field

Premise

In support of agriculture, today’s technology offers “Internet of Things” tools (IoT): wireless sensors that detect the micro-climatic conditions directly in the field, in order to intervene with plant protection treatments and targeted operations, when they are more useful for cultivation, with cost savings, resources and energy.

Precise, effective and efficient.

The wireless sensors are intelligent devices: they take and send data automatically and reliably. Furthermore, they can be interconnected with wireless actuators for triggering the desired action (eg: driving the irrigation system).

Among the various sensors, one of the most useful for viticulture and agriculture is the leaf wetness wireless sensor.

The leaf wetness

The leaf wetness is an agro-meteorological parameter determined by dew and rain, which is measured on the surface of the leaves (upper and lower side).

Capturing this data is used for multiple purposes:

  • monitor the health of the plant. The hours of leaf wetness constitute a factor (along with the simultaneous occurrence of other conditions) of the development of fungal diseases. The veil of water, in fact, allows the movement and the germination of spores, as well as their penetration into tissues of the plant.
    No cultivation is protected from the fungi. In fact, there are many diseases caused by them:
    downy mildew, botrytis and powdery mildew,foglia vite attaccata dalla peronospora
    late blight of tomato and potato,
    black spot disease of pear,
    Eye of the peacock of the olive tree,
    Rhizoctonia solani of potato and tomato,
    Alternaria alternate of the apple tree.
    To name a few …
  • develop predictive models for the prevention and control of plant diseases to intervene in when you really need with phytosanitary treatment;
  • control irrigation operations;
  • assess the intensity or the occurrence of events such as fog or rainfall.

Features-type of a leaf wetness wireless sensor.

Appearance

The sensor mimics the characteristics and thermodynamic behavior of a leaf. It’s a high-tech device that detects moisture on the upper surface and the lower one of the leaf.

bagnaturafogliare

leaf wetness sensor integrated into the monitoring system SAVE GRAPE 

Material

In paper, hemp or vetronite, there are many materials used to make the leaf surface of this type of sensor. The choice of an inorganic material, however, prevents the absorption of water and thus is more accurate in measuring the real state of wetting. The thin layer of fiberglass, furthermore, is exposed in the same way to solar irradiation as a real leaf: the moisture present on the upper and lower page is condensed or evaporated at the same speed of a real leaf.

Installation

It may be located directly in the field or it can be added to a system for monitoring more complex as SAVE GRAPE. The small footprint, ease of use, the maximum reliability and a simple maintenance make it a device very useful for an efficient management of agriculture.

Operation

The wireless leaf wetness sensor detects the presence and quantity of water on its surface through the measurement of constant dialettrica, that in the case of water has a significantly higher value than to that of air, and the variation between two electrodes present in the sensor .
There are also sensors that according to the level of wetness, detect a change in the electrical resistance between the elements of a grid that make up the sensor itself.

Applications

  • Viticulture
  • Floriculture sector
  • Agriculture
  • Development of predictive models

Auroras chooses the best probes on the market and implements them in its own solution to offer the best price / performance ratio.





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