Agricultural Measuring

Our STELZNER® products deliver solutions for horticulture, agriculture, research and teaching, garden centres, floriculture plants, greenhouses and more

Using the AMOLA® for photometric determination of NPK

Mobile nutrient analysis


The AMOLA® Agrar Mobile Lab contains all the key reagents, equipment and accessories that you need to make a quick, easy and reliable assessment in the lab or in the field. It can be used to determine any of the main readily soluble, plant-available nutrients: nitrogen, phosphorus and potassium (NPK). It is useful for agriculture, horticulture, tree nurseries and composting plants applications. Consultants and plant production specialists also make use of the AMOLA®.

After a sample is taken, the ammonium NH4, nitrate NO3, potassium K and phosphate  PO4 in the soil are converted by extraction into liquids and treated with a specific colour reagent. The intensity of the colour indicates the quantity found in the soil of each of these substances.

The AMOLA® base unit provides you with an objective determination of the colour intensity. The sample type (e.g. mineral soil, substrate, water) and the desired soil component are first specified – then the desired measurement is displayed using the relevant units. For mineral soils, the displayed unit is kg/ha (kilograms per hectare) or mg/kg soil (milligrams per kilogram). For horticulture substrates the unit is in mg/l of substrate (milligrams per litre), and for water samples the unit is mg/l (milligrams per litre ).

Ammonium can be specified as NH4 and NH4; nitrate can be specified as NO3 and NO3-N. The total nitrogen is determined from the sum of the ammonium- and nitrate-nitrogen  (NH4-N + NO3-N). Phosphate is calculated as PO4, PO4-P or P2O5, potassium is calculated as K or K2O.

The manual (included here) uses simple illustrations to describe the sampling, processing, extraction and analysis methods.

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Using the AMOLA® for photometric determination of NPK
Phyto monitoring

Measurements of ethylene and carbon dioxide in plants and crops


The SSM 6000 Phyto stationary analysis system is used for continual measurements of ethylene and carbon dioxide in plants and crops.

Using gas exchange measurements on plant parts (such as on leaves or fruits), it is possible to determine information on plant growth and biological activity. Conditions for plant growth can be optimized and resource usage can be minimized by measuring the concentrations of ethylene and carbon dioxide.

The limit values for plant stress conditions can be determined using these measured variables. This information can then be used in conjunction with an automation system to provide process control within the greenhouse.

Example of usage

Fully automatic continuous monitoring of plant physiological data in tomato greenhouses: for improving the yield or discovering energy saving potential. Integration of the data obtained into the greenhouse control mechanism.

Measured data collected
– CO2 gas changes (photosynthesis, respiration)
– Leaf temperature
– Photosynthetically active radiation (PAR)
– Global radiation
– Leaf transpiration

Phyto monitoring

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