KNNA said:...
If you use it as hydro medium, of course you need to add all the nutes the plants needs, as coco is a near inert medium. Coco coir has a very high cation fixation capacity, as well as very high cation exchangeability. But its neccesary to mantain a equilibrium between the differents cation, otherwise lockouts appear. To manage this, ph control is the key, using all the hydro range (wide range:5,3-6,3, narrow range 5,6-6,1). If you run a ph over 5,8 continously, Ca accumulates in the medium and produces a lot of problems. Flush rids anions easily, but its more difficult wash out cations fixed in the medium.
There are 2 "schools" in coco coir growing: one use ph over 5,8 , add Mg continuosly and flush periodically (the advise of Kapt Krink), while the other use a wider ph range trying to avoid salts accumulation by ph management, without adding CalMg nor flushing...
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