Def nitrogen tox. How much are you feeding them and what are you feeding them?
Try and keep Potassium:Calcium:Magnesium at a 4:2:1 ratio as a starting point. Most plants will enjoy this. Some may require tweaking.
Otherwise they mess with eachothers absorption.
Look up Mulders Chart. It shows every nutrients protagonist and antagonist in terms of nutrient absorption
Source of text: Soil Analyst Cooperative : https://soilanalyst.org/Source of Chart: NutriAg: https://www.nutriag.com/AntagonismMulder’s Chart shows some of the interactions between plant nutrients.High levels of a particular
permaculturenoosa.com.au
How the arrows work is if its pointing towards a nutrient it affects that nutrient. Some nutrients effect each other in both directions. Like Potassium and Magnesium for instance. As you can see Calcium affects the uptake of 7 different nutrients.