@JayY2015
BioChar will pull nutrients out of your soil unless it's pre charged. When growers put it in their soil mix without pre charging it their plants yellow prematurely.
There are many ways to charge BioChar. I usually bubble 1/2 cup kelp meal and 1/2 a cup of neem seed meal per five gallons water, for a day and then use the tea water to soak the BioChar in for several days. Another way would be to make a compost tea and charge it with that or some use Fish Hydroxylase.
Where did you get your BioChar?