fatman7574
New Member
REASON FOR 2-PART' A AND B MIX.
To In order to combine all the elements commonly needed for plant growth into a concentrated form, the salts need to be mixed into 2 separate solutions. The reason for this is that, while in dilute solution all ions become soluble, in concentrated solution certain ions react together to form insoluble salts. If an ion is in an insoluble salt, it is no longer available for plant growth. Once precipitated it can only very slowly dissolve back into solution when diluted again. Precipitation is simply the result of two ions combining in solution to form a salt which is insoluble, eg when calcium nitrate and magnesium sulfate are added to water in strong solutions the salts dissociate producing magnesium nitrate along with calcium and sulfate ions which then combine to form calcium sulfate or gypsum which precipitates. This occurs because compounds such as calcium sulfate have very low saturation values and can not exist as concentrated solutions. Generally it is necessary to keep the calcium separate from the sulfate and phosphate salts. Therefore the calcium nitrate and calcium chloride is kept separate from the magnesium sulfate, potassium sulfate, sulfates of trace elements, and monopotassium phosphate, all other salts can be mixed in either A or B. There are certain brands of nutrient which seem to combine all elements into a single mix, but the manufacture of these
products is beyond the reach of most growers.
To In order to combine all the elements commonly needed for plant growth into a concentrated form, the salts need to be mixed into 2 separate solutions. The reason for this is that, while in dilute solution all ions become soluble, in concentrated solution certain ions react together to form insoluble salts. If an ion is in an insoluble salt, it is no longer available for plant growth. Once precipitated it can only very slowly dissolve back into solution when diluted again. Precipitation is simply the result of two ions combining in solution to form a salt which is insoluble, eg when calcium nitrate and magnesium sulfate are added to water in strong solutions the salts dissociate producing magnesium nitrate along with calcium and sulfate ions which then combine to form calcium sulfate or gypsum which precipitates. This occurs because compounds such as calcium sulfate have very low saturation values and can not exist as concentrated solutions. Generally it is necessary to keep the calcium separate from the sulfate and phosphate salts. Therefore the calcium nitrate and calcium chloride is kept separate from the magnesium sulfate, potassium sulfate, sulfates of trace elements, and monopotassium phosphate, all other salts can be mixed in either A or B. There are certain brands of nutrient which seem to combine all elements into a single mix, but the manufacture of these
products is beyond the reach of most growers.