Dear stovers,& Rolf ,
Basic soil needs humus to bring pH 8,5 to 6,5
Basic soil by Ca exess has lack of Mg take up to form Chlorofil leef green
.Result yellow leaves .
Char has no chemical effect .
Sometimes water and minerals into the char are usefull at pH 5,5 -7.
Basic soil makes trace minerals unsoluble and not avaiable to take up .
Zn and Se can profit of basic soil .
Too acid under pH 5 dissoves Aluminium from clay ,a plant killer .
Regards
Frans
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