H2Gro & Peat Substitutes: the Importance of Re-wetting

Scientific trials on H2Gro and how it influences substrates’ moisture, have shown a very good effect on a variety of differently structured substrates. A trial conducted under the supervision of Dr. Lohr at the Weihenstephan-Triesdorf University in Germany confirmed this effect and the long-term effect of H2Gro in peat-reduced substrates.

Trial on H2Gro’s Effect on 70% Peat and 30% Wood Fiber

In this experiment, a peat-wood fiber mixture with a ratio of 70% peat and 30% wood fiber was used in 12 cm pots. The substrate in the pots was completely saturated and then dried in a climate chamber at 25°C (5% relative humidity). This cycle was then repeated 10 times. The long-term effect of H2Gro was confirmed throughout all 10 saturation cycles.

Water uptake in ml/pot with H2Gro (150 ml H2Gro/m³ substrate) over the 10 saturation cycles (with subsequent drying back) compared to the control without a wetting agent.

H2Gro Improves  Water Uptake in Peat-reduced Substrates

With an increasing proportion of peat substitutes, the water uptake steadily decreases compared to pure peat substrates. Therefore, the irrigation strategy should be adjusted accordingly and monitored closely. An application of 1.5 ml H2Gro/liter of irrigation water immediately after setup ensures good water uptake and provides more uniform plant growth.

Peat substrates also serve as water buffers. Re-wetting becomes particularly important when using peat-free substrates. Thanks to its characteristics, H2Gro improves the water balance when using peat-substitute materials.

The difference on water uptake between peat-based substrates and peat alternatives is big and this is why it is important to set up a proper moisture measurement on substrates alternative to peat, as explained in this article.

Conclusion

Similar to the above-mentioned trial, other experiments conducted by ICL in the United Kingdom, clearly showed that good re-wetting is crucial for successful cultivation. For personalized guidance, contact your regional technical support by visiting your country’s website or fill in the form you can reach from the banner at the bottom of this page.