LAQUAtwin is a series of pocket ION meters. Using Ion Selective Electrode (ISE) technology, they are available for measuring Conductivity, Calcium, Nitrate, Potassium, Sodium, Salt concentration and pH measurement. Using just a tiny amount of sample, the LAQUAtwin proprietary flat sensors can quickly and accurately measure the values of the chemical parameters in the field.
Potassium is a necessary nutrient for soil in which rice grain is grown, as it is critical in maximising yield.
In order to profitably produce rice, reliable information regarding the potassium content of the soil must be available to farmers. Thus, we can analyse the potassium content of the plant tissue in the roots of the rice grain.
To determine the potassium content, the Horiba LAQUAtwin K+ ion meter can be used. This is an easy and quick method used to determine the potassium content of soil for the growth of rice crops.
1. The above ground portion of the crop is separated from the root using shears.
2. The lower stem is washed of soil.
3. The stem is cut into 1 cm pieces.
4. The pieces of stem are frozen overnight
5. A frozen piece of stem is placed in a sap press to obtain the sap
6. A small sample of the sap is placed on the sensor of the LAQUAtwin K+ ion meter and the potassium content is measured after one minute.
7. To repeat sampling, wash the sensor with tap water and pat dry with a paper tissue.
The use of the Horiba LAQUAtwin K+ ion meter to measure the potassium content of soil around rice crops will improve farmers’ knowledge of the potassium accumulation. Accordingly, farmers can fertilise their crops with optimal amounts of potassium.
The LAQUAtwin K+ ion meter is small and compact, and convenient to carry for easy on-site testing. Its easy-to-use interface is simple for anyone to use the LAQUAtwin K+ ion meter.
Average tissue K levels for rice plant parts at growth stages for K treatments, 2004.
| Growth Stage | Plant Part | Tissue K % | ||
| 0 lbs K/a | 50 lbs K/a | 200 lbs K/a | ||
| First tiller | Whole | 2.53 | 2.99 | 2.62 |
| Internode elongation | Whole | 2.19 | 2.27 | 2.82 |
| Internode elongation | Flag leaf | 1.85 | 2.34 | 2.37 |
| Internode elongation | Lowest leaf | 1.62 | 1.99 | 2.24 |
| Internode elongation | Stem | 2.77 | 2.88 | 2.24 |
| 10% Heading | Whole | 1.50 | 1.71 | 1.74 |
| 10% Heading | Flag leaf | 1.60 | 1.56 | 1.73 |
| 10% Heading | Lowest leaf | 1.45 | 1.39 | 1.37 |
| 10% Heading | Stem | 1.47 | 1.28 | 1.49 |
| 10% Heading | Head | 0.92 | 0.91 | 0.86 |
Dry matter and K uptake for K treatments at three rice growth stages, 2004
| Growth stage | Pre-plant K treatment (lbs K/a) | Pre-plant K treatment (lbs K/a) | |||||
| 0 | 50 | 200 | 0 | 50 | 200 | ||
| …Dry matter (lbs/a)… | …K uptake (lbs K/a)… | ||||||
| First tiller | 131 | 154 | 220 | 3.5 | 4.5 | 5.7 | |
| Inter-node elongation | 1770 | 2070 | 1853 | 33.1 | 44.7 | 52.8 | |
| 100% heading | 6734 | 7055 | 7660 | 101 | 120 | 131 | |
David Dunn, Gene Stevens “Plant Mapping Potassium in Rice Tissue: What Part to Sample When?: Second Year (2004) Progress report” University of Missouri-Delta Center
Pocket ION Meter
HORIBA’s highly-sensitive, flat sensor technology opens up new possibilities for sampling and sample types. Only a small amount of sample is required, so you can easily sample in situ without the need for beakers or other labware. Sensors are easily replaced as required.
Hassle-free automatic calibration with a few drops of standard solution reassures you of your measurement accuracy. Two-point calibration is also possible.
The meter and sensor are fully waterproof and dustproof, so you can take it anywhere.
The compact carry case contains everything you need for your measurements, including the standard solution and sampling sheets.
Only LAQUAtwin allows you to be this flexible!
Choose the best method according to your sample, your situation, and your needs.
When you're in the lab, you can test the sample in a breaker. Ensure the sensor guard sliding cap is open.
Accurate pH measurements in a few seconds, from a single drop.
Water pH varies in different environments, and a slight change can often have a major effect.
Whether you need to keep the pH of an aquarium within tight limits, are checking for the acidity of rain water or for the quality of meat and fish products, LAQUAtwin compact pH meters are ideal for you. No matter where and when you need to test.
Determine water conductivity with as little as 0.12 mL of sample. The conductivity of rain water is a trusted guide to determining atmospheric purity. In agriculture, measuring the conductivity of soil allows farmers and agronomists to determine optimum fertilizer usage and check the ‘health’ of soil after salt water damage. The LAQUAtwin meter makes conductivity testing simple, anywhere.
Only compact meter for a quick and reliable measurement of sodium ion at the scene using ion selective membrane.
Only compact meter for a quick and reliable measurement of potassium ion at the scene using ion selective membrane.
Only compact meter for a quick and reliable measurement of nitrate ion at the scene. Special application packages for crop (B-741) and soil (B-742) are also available.
Only compact meter for a quick and reliable measurement of ionized calcium at the scene using ion selective membrane.
