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Produkty > Greenhouse technique

Cultivation under covers such as foil, foil tunnels and greenhouses requires special care and exceptional precision irrigation. Thanks to these treatments, it is possible to accelerate the harvest date, and also to obtain a richer and better-quality crop. The vegetables under cover are protected from unfavorable weather conditions, which makes the cultivation more predictable. Due to the fact that during the growing season, different plant species, at different development stages, show different water needs, it is necessary to precisely control the irrigation process. Our company offers growers who grow vegetables in greenhouses or foil tunnels computer programs that analyze the needs and control the maintenance of air and substrate humidity at the optimal level. Thanks to cooperation with Senmatic, we are able to offer the latest technological solutions, ranging from mechanical and electronic climate control, through irrigation and fertilizer mixing, to lighting with LED lamps. As one of the leading suppliers of professional irrigation systems, we offer turnkey solutions, guaranteeing compatibility and easy combination of different technologies.

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Tensiometer

Description

The tensiometer is a precision device for measuring soil moisture. Measurement of soil moisture notifies you of the need to irrigate plants, and is used to determine the height and frequency of irrigation, because plants growing in optimal humidity can be maximum efficient.

Models: 20 cm, 30 cm, 50 cm, 100 cm (reading from above)

The tensiometer consists of:

  1. A ceramic filter with fine pores
  2. Transparent plastic tube (for operation must be filled with water)
  3. Vacuum gauge with coral scale
  4. Gaskets

The vacuum gauge measures a pressure in the range of 0 to 600 hPa (= mbar). It is a device with an accuracy class of 1.6, i.e. the deviation of the displayed values ​​is max. +/- 1.6%.

The green color on the colored vacuum gauge scale indicates the optimal humidity range for most species of vegetables, berry plants and fruit trees. This range applies to all soil types (sandy, loam soils).

The vacuum gauge has easy in value interpretation colorful scale . The silicone plug well surrounds the tip of the vacuum gauge, allowing the tensiometer to close tightly, and protects against minor soiling and allows easy filling of the tensiometer with water in the field.

Technical data

Jednostka pomiaru:mbar (= hPa)
Zakres pomiaru:0 – 600 mbar / hPa soil suction power
Wakuometr:accuracy class 1.6 (1.6% max.)
Zamknięcie:always a tight silicone stopper
Rurka:outer diameter 16mm, diameter ext. 12mm, wall thickness 2mm
Sączek:5cm

How the tensiometer works

The tensiometer measures the soil suction power, i.e. measures the force with which water will be retained in the soil, and thus the force that the plant roots must bring to get it from the soil. When preparing the tensiometer for operation, fill it with water up to approx. 1 cm below the top edge of the tube and installing it vent the vacuum gauge . Thanks to the ceramic filter, the water in the tensiometer and in the soil is in constant connection. In case when it is dry, the soil draws water from the tensiometer creating a pressure , which is measured by a vacuum gauge. This pressure corresponds to the suction power of the soil. After irrigation or rainfall, when the soil humidity rises, the water begins to flow from the soil into the filter until the potentials between the soil and the tensiometer are equalized. After irrigation, the tensiometer shows the correct value after about 15-30 minutes, because the water must first penetrate into the deeper layers of soil.

Getting started

The tensiometer ceramic filter should be soaked with water before installation. Therefore, an empty strain gauge without a vacuum gauge should be left in a container with water overnight. Water should collect in it by morning. Immediately before installation, the strain gauge should be filled with water to approx. 1-2 cm from the top edge of the tube and the vacuum gauge should be placed tightly on it.

Range of activity

One development unit (development unit is an area with the same soil type and one plant species at the same developmental stage) requires one tensiometer. For more information, i.e. permeation of water used for irrigation, and water uptake by plants from different soil layers, additional strain gauges can be installed at different soil depths (e.g. 50 or 80 cm).

Precautions

To avoid damaging the tensiometer, observe the following precautions:

  • the components of the tensiometer must be protected against operations of adverse effects (do not throw it on the ground, do not squeeze it in a vice, do not hammer it into the ground with a hammer, etc.)
  • as long as the strain gauge is filled with water, do not expose it to temperatures below 0 ° C
  • avoid contact of the ceramic filter with grease, oil and other substances that could clog its pores

 

Solution of problem

The tensiometer can measure soil suction power even from –700 to –850 hPa, but when the suction power value increases (i.e. the soil dries even more), the water from the tensiometer is completely drawn off and the vacuum gauge shows zero value. The inside of the tensiometer fills with air (the tensiometer is aerating).

Typical applications: strawberries, other berry crops, vegetables, asparagus, crops under cover and in greenhouses; also field crops.

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