PH-Problems in Soil

it's your amendments that are doing it.. Need more garden lime or soemthing else 'basic' to ph-balance it. Adjust the ratios of what you are putting into the soil and it can fix the problem. or, buy a different brand. nutes enter the plant primarily 2 ways -- mass flow, which is just diffusing across a membrane and "active transport" where it selectively grabs certain molecules -- not all enter equally through each path. So, if the molecules that help ph-balance it are more quickly depleted around the roots (active transport), it'll cause ph shift. The nutes around the roots should not be supplied at the rate of use but maintained at critical levels around the root, if that helps it make sense. critical levels are more about how available each is... is it being limited by pH or concentration of other nutes etc etc... Whether you are using "soil" fertilizers or "soilless/hydo" fertilizers will impact the required ratio too. there's nothing wrong with peat moss base. it's the best base you can use. e.g. pro-mix hp and bx bales come ph-balanced but the raw "premeire" peat moss made by same company is trash to use out of the box. you need to ph-balance it and add wetting agents etc. Even so, it's less dangerous than a bad match of coco that can absolutely kill plants.