the frequency of fertigation will impact on the level of nutes a plant can assimilate... the nutes are ions solved in the water which the roots will attract electro-chemically and if plant needs them, EC in the pot should fall... so the more often you feed the less high the feed EC should be and these interrelated factors are the reason why there can be no exact values given to EC strength. but your plant surely tells you: more
so you may wanna start by watering in the periodically (like daily, twice a day) and then adjust feedstrength. when leaves gets darkgreen (ok) >> burnt tips (go easy) >> claw (toxicity) you arrived at the other side. find the middle.
EC & pH meter would be beneficial also to control your water.