PPM and watering

I don't use Biobizz, rather I make my own blend of synthetic fertilizers, and sometimes use a pre-blended ones, so I am focused on hitting PPM (parts per million) for each macronutrient (N - nitrogen, P - phosphorus, K - potassium). PPM is the concentration of a substance in a solution (or mixture), or put another way, how much mass (or volume) of N or P or K do I have in the volume of water. You can also think of it as how many parts of say Nitrogen do I have in one million parts of water. So it's a ratio. This is useful because if I have a target of 160 PPM of nitrogen, I can convert PPM into grams per liter (or gallon) of a fertilizer so I know how much fertilizer to use. I'm sure you have noticed each fertilizer is labeled with different NPK values, so this conversion lets you figure out grams per liter regardless of the fertilizer you bought. I use this calculator to determine how many grams of fertilizer I should put into a liter of water (then convert to gallons): https://www.omnicalculator.com/biology/water-soluble-fertilizer To use this calculator I always change the first drop down (fertilizer preset) to custom, then I enter the NPK values of the fertilizer I am using (from the label on the fertilizer) under the fertilizer label section. After that I select the element I am targeting (trying to determine grams per liter for, say nitrogen). Then I enter the desired PPM (say 160 ppm) under Mass Concentration and then I scroll down and look at the Fertilizer Rate (and check it is set to g/l or grams per liter). I then convert to gallons by multiplying that number by 3.785412. Then I bust out my scale and weigh that much fertilizer and dump that into a gallon of water and mix it in. And then I have the fertilizer at the right concentration to hopefully avoid nutrient burn and provide what the plant needs for optimal growth. For creating my own blend of fertilizers, I then look under the Nutrient Solution Recipe and determine how many PPM of each element I have provided for fertilizer 1. I subtract those from my total targets and then calculate what I need for fertilizer 2 and/or 3. This part can get complex, so if you're curious, please reach out directly and I can explain more. To determine PPM targets, I try to research different articles and controlled studies. Here are two nice ones as food for thought: https://israelagri.com/advances-in-science-based-fertilization-technologies-for-medical-cannabis/#:~:text=optimal%20nitrogen%20level%20at%20the,concentration%20of%20cannabinoids%20and%20terpenoids https://www.cannabisbusinesstimes.com/climate-environment-control/greenhouse-cannabis-cultivation/article/15689911/put-your-fertilizer-program-to-the-test This is a nice article on calculating PPM using volume, like tsp, (instead of mass), and explains a bit more: https://www.gardenmyths.com/calculating-the-ppm-of-nitrogen-in-your-fertilizer/ Hope this helps, and happy growing!

PPM is just a concentration measurement. ug/L is not the same as elemental ppm. Sometimes these things get used without delineating the difference. One is just based on mass, but the other is about molecules or atoms per liter, which is how they get used.. they aren't used per gram they are used per atom/molecule. They all have different densities. One thing to understand is that an EC probe measures conductivity, not concentration. It only correlates. Depending on the manufacturer, it will use one of several conversion factors, which tells you all you need to know about it's accuracy. A different pen might give you a drastically different number. This is okay relative to 1 garden. If you change products the expected readings may possibly shift a bit. I don't know how volatile that is based on the options for fertilizer ingredients. Mulder's chart - summarizes relationship between the nutrient elements. The ratio of nutrients can impact how much of each you need. Your local temp/rh and atmospheric co2 matter too.. so, what you need can vary quite a bit from others. when looking at elemental ppm, 600-700ppm is a good spot to start for a soilless/hydro context. Again, your EC conversion of 870ppm is not the same animal. in soil, it's all the same cause and effect as far as the goal of nutrient concentration resulting around the roots, but you supplement what the soil provides.. you only add various parts that are lacking or have been exhausted over time. This takes familiarity with the soil product used - any any amendments you make. Rate of use Vs rate of root intake.. if you provide too high of concentration relative to root intake, you run into a toxicity. and vice versa, a deficiency. Observe and adjust. Overall concentration won't help much diagnosing issues or making adjustments to your fertilizer composition (i.e. ratios of nutes provided).

https://floraflex.com/EU/blog/post/understanding-ec-and-ppm-in-cannabis-growing-a-comprehensive-guide https://www.royalqueenseeds.com/blog-cannabis-water-quality-part-2-ppm-ec-n298 Just google it. "PPM/EC and Cannabis" Its not to hard. but if the plants are fine then prob does not matter if you have a gap in your understanding. the rest is there and supporting it.

Hey bro, I’m running Biobizz organics too and honestly – PPM isn’t the main thing I focus on in living soil. The key is keeping the microbes happy and the soil food web alive. I boost it early on with worm humus for nitrogen, and keep everything active with molasses and effective microorganisms (EM) throughout the grow. As long as your pH is stable (around 6.2) and your girls look happy – you’re doing it right! With organics, it’s less about the numbers and more about the vibes in the soil 🌱😄 Keep it organic, keep it living! ONLYBUDS ✌️🍀

With Biobizz organics, a PPM of around 870 isn’t bad at all especially if your plants look healthy. PPM mainly measures dissolved minerals, but organic nutrients like Biobizz don’t always show up fully on a PPM meter since many components need to be broken down by microbes first. So don’t stress too much about the number if your pH, VPD, and PPFD are dialed in and the plants are thriving, you're on the right track! Hope this helps!