START A&B – THE SCIENCE
To take in an anion a plant has to release an electron (−). This electron when released into water is adding a negative load creating a hydroxide (OH−) particle. This OH− particle will bring the pH up in the root zone/substrate.
To keep the pH in the substrate at optimum level for the start phase another type of nitrogen is used, which is referred to as ammonium (NH+4). This is a positive ion and the first of all ions to be taken by the plant. For further information, please read growing science. If a plant takes in NH+4 a plant has to release a proton (+). This proton when released into water will add a positive load creating a hydrogen (H+) particle. This H+ particle will bring the pH down in the root zone/substrate.
A plant needs more NO−3 in its early stages and therefore releases more OH− particles than at later stages, so it needs the correct level of NH+4 to release the correct level of H+ particles to control the internal pH regulation of the substrate as well as the pH you choose to feed with from your feed tank. This ensures the pH is kept in a range that allows the elements to be taken in by the plant.