PRODUCTION the system, without this natural buffer, growers have to be careful not to shock the plants with an overdose of a chemical. " Applying the right amount of fertilizer can be challenging because when the nutrients are mixed into the water supply, the pH levels must still be at the right levels for the plants to absorb the right amount of the nutrient solution. This can be timely without a fertigation system because it means the grower will have to manually pour, mix and test, using a trial and error process until the pH levels are correct.http://www.GPNMAG.COM