Lettuces are season vegetables coming from India and cultivated for more than 2000 years ago. The bigger producers are China and the United States. Depending on the variety the leaves change of shape and colour. Two of the most popular varieties are the Roman and Iceberg. The Roman lettuce is big and erect, while the Iceberg one is round and smaller.
By Sistema Azud, S.A. based in Alcantarilla, SPAIN.
Protection against Frosts
Reduces drastic temperature changes
Drastically reduces frost damage by cushioning sudden temperature drops.
By providing a micro-climate with greater temperature than that of the environment, reduces harvesting time.
Main crops: strawberries, lettuce, flowers, melons, watermelons, pumpkins, tomatoes, peppers, among others
By Polymer Group Inc. (PGI) / Agribon® based in San Luis Potosí, MEXICO.
Measuring Ion Concentrations in Plant Tissue
- Aptisens Digital or Mobile Multiple Ion Kit
- Weighing scales
- Liquid measurement device e.g. graduated cylinder
- Bowl for stirring
- Spoon for stirring
- Filter paper / muslin
- Conical flask / vessel
- Aptisens multiple ion conditioning solution
- Aptisens Plant Tissue multiple ion calibration solutions
- Deionised water
This preparation can be applied to any plant tissue. Take a sample of lettuce and remove any soil but do not wash the plant tissue as doing so may reduce the number of ions in sample. Weigh this sample and record (say 100 g). Macerate the plant tissue in a blender and add a known amount of hot deionised water to the sample to extract the nutrients. For example, dilute the sample two-fold (200 mL), three-fold (300 mL) or five-fold (500 mL). Ensure all the plant tissue is covered with water and leave to sit for approximately 30 min with some stirring. The sample then needs to be filtered.
Set up a funnel with folded filter paper in a conical flask or any vessel that can hold a funnel. Pour the plant tissue and water into the funnel and allow the mixture to filter. Collect the filtrate.
Before use the multiple ion probe must be conditioned in Aptisens multiple ion conditioning solution. Ensure the correct calibration solutions for a three-point calibration are set up on the Mobile meter or MeterLink. Follow the instructions for calibration and proceed to take a sample reading when the calibration data is ‘very good’ or ‘good’ for all ions.
Place the probe in the plant tissue filtrate and ‘Take a Sample’ reading. The concentrations for each ion will be displayed in ppm or mmol / L.
Remember to multiply these concentrations by the dilution factor.
After taking your reading be sure to remove the sensors from the solution as quickly as possible, rinse with deionised water and replace the cap of the probe
By Aptisens based in Little Island, IRELAND.
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