Dry Leaves, Yellowing, Curling Down Leaves... Rockwool

mojave green said:

Roots need more oxygen

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Drlovekek said:

And how can i fix that?

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Phaeton said:

Mohave green's advice to allow the rockwool to dry out some before rewatering is giving a signal to the plant to grow more root.

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Phaeton said:

Leaves evaporate water which is absorbed through the roots. Out of the myriad factors affecting both, the main driver is surface area.

More leaves have more evaporative surface. If the leaves outgrow the roots then the problems start.
Inflow through the roots is controlled by the area available for water to flow through. Small adjustments can be made but size matters almost exclusively.

Mohave green's advice to allow the rockwool to dry out some before rewatering is giving a signal to the plant to grow more root.
Another long term procedure is with an infra red light supplement. Properly timed 840 nm infra red causes faster growth in plant extremities (root tips and branch tips). Not recommended for budding plants due to excessive small leaves in the buds.
Volume is the largest single factor, sizing the plant for the container for each stage of growth eliminates the problem. Rootbound plants reach a tipping point even transplanting into a large container will not fix. The knotted mass slows the flow even if new roots are added.

Keeping ahead of the growth curve is as important as the nutrient mix or lighting.[/QUI
I agree. If you wait too long to transplant then the plant could be beyond help. That is why I said a person needs to transplant as soon as roots start to poke out of the small cube. Newly germinated seedlings and cuttings are meant for very short term growing in the small cubes.

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mojave green said:

yes, and oxygen also kills anaerobic bacteria that cause root disease. similar to allowing a kitchen sponge to dry out before reuse.

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