THE INS AND OUTS OF SUBSTRATES: FROM WOK TO RESPIRATION AND FROM POTTING REFERENCE TO PH.
Testing the plant safety with test crops.
What is their function and effect?
8 factors determine the pH in the culture. How do you influence them?
Also safe packing material for export of flowerbulbs.
Insight in the density of the soil caused by potting.
Insight in the stability of an organic raw material.
Insight in the rate of water uptake of substrates.
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