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Are you interested in a soil amendment calculator?

Are you wasting time and money on applying amendments to your soil that the plants do not actually need? Are you sure that your amendment combinations result in maximum plant growth? Would you like to build a rich soil that requires little or no soil inputs through the growing season? Would you like to be able to grow in native soil? I am considering developing an amendment calculator to assist outdoor growers in determining what amendments and how much of the amendment they should apply to their soil.

The calculator would give specific recommendations for their soil. The way that it would work is that growers would take a representative number of soil samples determined by total soil volume and area. The samples or composite of samples would then be (anonymously) sent to a cooperating soils lab and analyzed for appropriate parameters i.e macro/micro nutrients, soil texture, pH, base saturation, cation exchange capacity, micro/macro soil organisms and more (or a person if equipped could analyze their own soil). The parameters would vary depending on how much the grower wanted to spend on the tests.

The grower would then plug the lab results, site specific parameters and their locally available brand specific amendments and/or available materials (manure, sand, worms etc.) into the calculator. The calculator would then tell the grower how much of each of the amendment should be applied to their soil for optimum plant growth. Amendment recommendations would be given as a range and those ranges would get smaller as more research is conducted. I'l also likely include cost options where growers can choose between bare minimum, middle of the road or premium recommendations.

The information that I would use to determine amendment application rates would be based on the best available science and information, the calculator would be updated when new data is available.

I am also very interested in dialing in application rates with my own research. I would design experiments where one variable is manipulated at a time, including controls and replicating the study multiple times per run. Currently I develop calculators and amendment science for food crop industrial agriculture. I am academically trained in agriculture research with a specialty in soil science and organic amendments. I develop models that show nutrient release over time from organic materials on a large scale. Also, I have adequate experience both indoor and out with small and large pot grows. I chose my career path out of a love for Cannabis with a plan to return to the industry someday and really sit down and dial in precise nutrient and amendment requirements for maximum yield and quality. I want to do the kinds of studies that other ag. industries started doing over a hundred years ago. I had to actually learn how to do that first. I will be free in one year to start work.

Its not that I am arrogant/naive and think people don't know how to grow pot, its that processes can invariably always become more efficient saving money while reducing unnecessary resource consumption and their associated environmental costs.

Are you interested?

What would you like to see in a soil amendment calculator?

Questions-comments?
 
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Mikell

Dipshit Know-Nothing
ICMag Donor
Veteran
I think it's more the abundance of smartasses and wise crackers, nothing more :)


It sounds interesting, variation of hydrobuddy for soil. There are hundreds of soil mixes here and elsewhere, with thousands of individual variations. Questions are always popping up about substitutions, revamped ingredient lists, etc. Something to bring it all together for the average grower would be very helpful.

Could it be compatible without a soil analysis? re: fresh peat/coir indoor/outdoor potting soil mixes lacking native soil. Lime and flowering/vegative time would be factors?

And would you bring it to market, or release it freeware?
 
The calculator would not be useful exclusively to native soil, lab analysis of store bought potting mixes could also be plugged into the calculator and it would give accurate amendment recommendations.

The same would be true for peat, common potting mixes are made of peat, vermiculite perlite and minerals. A grower could mix the materials together to make a DIY potting mix.

Coco coir would be considered an amendment and if a person plugged in the physical properties of the material, the calculator would basically list everything that needed to be added to make it a useful soil.

As a side note, store bought potting mixes are made of native soil material. Histosols are soils that occur on cool, wet, landscapes which are mined for peat. Histosols are considered organic soils, the other 11 soil orders are considered mineral soils and are what people typically think of as a soil. Vermiculite is a low reactivity clay that was formed in a soil over time, perlite is formed from volcanic glass from siliceous rock volcanoes that has fallen and accumulated on/in soil, the material is mined and the water is removed with heat which causes it to expand and turn into perlite. Lime is mined from limestone but more interestingly is that all of the clay sized particles of the fine earth fraction in sedimentary rocks (limestone) were formed in a natural soil over time, eroded from the soil into an ocean and then cemented on the ocean floor.

Most of the amendments, potting mixes, minerals used to grow plants out of the ground come directly or indirectly from a native soil. Which makes sense because plants evolved to grow in those materials. Every plant essential nutrient also naturally occurs in soils in varying degrees.

As more states legalize and profit margins narrow I think more people are going to start growing in the ground. I also think people are going to be surprised by how well ganja does in the ground if they know how to modify the soil properties for the plants specific needs.

Flowering and veg times are a function of genetics and latitudinal photoperiod. Data could be developed to handle the variation of genetics and location specific photoperiod, but it is low on the priority list considering how complicated this calculator is already going to be. Most likely I will aim to have the nitrate and ammonium fade out of the soil in the last few weeks of flower for Nor. Cal. photoperiod, running a 8-9 week finisher.

Lastly, if I can avoid charging people directly to use the calculator I will. The endeavor will require time energy and resources to complete and it would not be possible unless I recovered the expense somehow. I am more interested in finding funding to do the needed experiments and the calculator would be tied into the service I provide. The calculator will be developed before the experiments but as data is developed the calculator will be updated.
 
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Former Guest

Active member
what if you offered a conversion calculator for free so people can convert lbs per acre to cubic feet of potting mix so they can try themselves and offer premium services you mentioned as an upgrade. most people need the recommendations. I have never bought an app without trying it first for free. I would be highly interested in getting my soil tested if I could get recommendations for a reasonable price. getting an analysis report back would just be confusing to me right now, but the testing is the cheap part.

have you considered that some people believe you should just feed it what it needs like what I think you're suggesting, and then others want the fully amended soil that may have too much fertilizer and don't mind the extra cost of amendments? just offering one type of recommendation could limit your customer base possibly who share a differing opinion...not like that happens in the cannabis world :)
 
have you considered that some people believe you should just feed it what it needs like what I think you're suggesting, and then others want the fully amended soil that may have too much fertilizer and don't mind the extra cost of amendments?

I will probably include an economic option that the grower can select

minimum, middle or premium. Or something to that effect.

The idea of the calculator is to increase efficiency. I would like to think that growers will stop adding amendments they do not need if they are compelled by data from well done research.
 
If it is free though you should add 2 or 3 options

Bush mix - Add 3 ingredients and let sit for x amount of time

Home mix - Add 10 ingredients turn weekly for x number of weeks

I probably will add some different options. As far as I can foresee though the calculator would have the most value to outdoor growers because they are dealing with large volumes of soil and cost becomes more of a factor.

I understand not wanting to pay for stuff, I am a big fan of that. I am curious though what your reasoning is for outright deciding you would not pay for the calculator? Also, even if I did offer it for free you would still have to pay for lab fees which would likely add up to hundreds of dollars.
 

Mikell

Dipshit Know-Nothing
ICMag Donor
Veteran
Do you want a lot of people using the service, or do you want to recoup finances/generate income? If the latter, it's not hard to imagine someone releasing a freeware version soon after. Hydrobuddy is somewhat popular, I can't imagine anyone using it if they charged for the service.

It's a bit of a suppository to swallow convincing people to pay for something they can already do for free (albeit not as effectively or efficiently).
 
Do you want a lot of people using the service, or do you want to recoup finances/generate income?.


I really would like the calculator to be free of charge. The calculator is just one piece of the bigger goal of doing field research to investigate the most common amendments used and determine optimal application rates/soil conditions. If I can generate interest for future research by offering a free calculator now it would be worth it to me. It is likely that my recommended ranges for the *initial* calculator will be high because the actual data available is very limited and I will only recommend what I know for sure works. I want to do studies that whittle those numbers down.

Last season my mind was blown when I saw two side by side outdoor grows where one was in raised beds with custom built rich organic soil, and the other was planted right in the ground in a shallow Inceptisol with about 30% clay. Both running designer strains. I dont know the exact numbers of yield, but I do know the native soil grow was a lot more successful than I thought it would be with such a high clay content (poor drainage). Having the side by side comparison was illuminating and reinforced what I already suspected, and that is many amendments are not needed at such high rates and that active clays are likely important to hold nutrients for slow release. I would guess that most custom built soils have less than 5% clay resulting in a soil where cations are leached out with watering. Doing a study that would determine the ideal soil texture (sand,silt, clay content) and upper limit of clay content would be one of the first parameters that I would investigate.
 
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i think this calculator sounds amazing! what is the exact N-P-K one is looking for in soil?

Thank you for the enthusiasm.

I do not know what the NPK should be precisely, I do want to find out. Most high quality soil mixes NPK can be found in these ranges 200-450 mg/l N, 200-500 mg/l P and 300-550 mg/l K.
 
S

Stone House

what if you offered a conversion calculator for free so people can convert lbs per acre to cubic feet of potting mix so they can try themselves and offer premium services you mentioned as an upgrade. most people need the recommendations. I have never bought an app without trying it first for free. I would be highly interested in getting my soil tested if I could get recommendations for a reasonable price. getting an analysis report back would just be confusing to me right now, but the testing is the cheap part.

have you considered that some people believe you should just feed it what it needs like what I think you're suggesting, and then others want the fully amended soil that may have too much fertilizer and don't mind the extra cost of amendments? just offering one type of recommendation could limit your customer base possibly who share a differing opinion...not like that happens in the cannabis world :)
I agree, it would be nice to be able to convert pounds per acre to cubic feet of soil
 

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