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If the only thing being added is 1 gram of cal/mag and the pH moves 1.5 points, a more than 10 fold increase since it is a logarithmic scale, I am thinking it is something it the water. There is only the info of 30ppm, it’s only enough info to take a guess and not absolutely solve the issue

Before adding cal/mag check the bicarbonate levels of your water. It could be a high amount of bicarbonate in your water which will buffer your pH.

CEC, Cation Exchange Capacity derives from the negative charge of organic matter and any clay in the mix. Sand has no nutrient holding capacity, but it gives the soil structure to allow for ample drainage. Nutritional value comes from either compost being broken down by microbes or added...

Soil triangle

Soil has five components sand, silt, clay, organic matter and pore space. The pore space is supposed to be half air space and half water. Refer to the universally used soil textural triangle to know what type of soil you are using. Compost, which is what most people are referring to as soil...

Cal mag and limed peat will do totally different things. Managing either is different than the other. Managing organic soil is obviously different than other mediums. All I’m pointing out is the ppm plant needs do not change based on the medium. How to achieve those levels changes.

Plant nutrient needs do not change because of the medium used.

ATP, Adenosine triphosphate is the result of respiration. When the plant breaks down glucose, produced during photosynthesis, the ATP is the energy the plant literally uses to grow. All plant need P, a good reference for ppm for an aqueous solution is Hoagland #1. Dr. Hoagland developed a...

It’s not Ca deficiency. Ca is immobile and a deficiency wouldn’t exhibit symptoms on older leaves and not the new growth.