How to calculate fertilizer per pot

ive seen two methods of doing so, but the results differ quite a bit.
how do you calculate the amount needed when growing in pots?

Method 1 for example:
Flue cured plants around 18,000 plants per hectare
Nitrogen needs per hectare: 50 kg N/ha
Pure nitrogen per hectare: 50000/18000 = 2.77g

Actual nitrogen per plant(using calcium nitrate 15.5-0-0): 2.77/0.155 = 17.92g


Method 2 for example:
Surface area of pot = 3.14 * r^2 = 0.0706
Nitrogen needs per hectare: 50 kg N/ha
Square meter of 1 hectare = 10,000m^2
Fertilizer per square meter = 50,000/10,000 = 5 g/m^2
Pure Nitrogen per pot = 5g/m^2 * 0.0706 = 0.353
Actual nitrogen per plant(using calcium nitrate 15.5-0-0) = 0.353/0.155 = 2.27g

As you can see the differences are large, and im not sure which one should i use.
your help will be greatly appreciated.

Are you growing in soil, or hydroponically?
In soil, full strength (for tomatoes) triple-20 fertilizer with a teaspoon of Epsom salts per gallon of water at transplant (1/2liter/2 cups per plant), then the same again at 4 and 8 weeks is a good copy for what is grown in fields.
Hydroponically, I have stuck with full strength triple-20 (with Epsom salts), changed every 2 weeks, until topping, then half strength for a week, then Ph balanced water until leaves ripen worked, but I have trouble with hydroponic plants- some cure easily, some won’t color cure at all…

I'm growing in soil.

Thank you for the suggestion of your practice but I will stick with the granular fertilizers, I already have them.

Don't forget phosphorus and potassium.

Bob

Chilik said:

I'm growing in soil.

Thank you for the suggestion of your practice but I will stick with the granular fertilizers, I already have them.

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Then go for the recommendation for tomatoes- same family and similar needs.

Definitely don’t forget the phosphorus and potassium- needed for root growth and leaf burning properties, respectively.

Absolutely, I have them as well.

But please, if you can shed a light on my question - I'm aware of the necessary rates, but I'm not sure how to convert it to pots, and if I need to use the same amount or not.

For my tobacco in the ground, I use approximately 1 pound of 10-10-10 fertilizer for a bed of 16 plants. That is roughly 28 grams of 10-10-10 per tobacco plant. I apply the fertilizer (granular) only once, prior to transplanting the tobacco seedlings. I apply no more during the growing season, unless the ground has experienced significant flooding during the first 2 weeks after transplant. In that case, I reapply the fertilizer (once) at half the initial rate.

Bob

deluxestogie said:

For my tobacco in the ground, I use approximately 1 pound of 10-10-10 fertilizer for a bed of 16 plants. That is roughly 28 grams of 10-10-10 per tobacco plant. I apply the fertilizer (granular) only once, prior to transplanting the tobacco seedlings. I apply no more during the growing season, unless the ground has experienced significant flooding during the first 2 weeks after transplant. In that case, I reapply the fertilizer (once) at half the initial rate.

Bob

Click to expand...

Thank you for the information, bob.
Would you consider to change this amount when growing in pots? Taking into account variables like leaching, smaller root development, and the fact that in pots you don't have the buffering effect you get from the soil.

The math is easy to understand, Im just worried that I'm not taking something into account when dealing with plants that grows in pots.

I'm not very knowledgeable about growing tobacco in pots.

Bob

Usually, time release fertilizer has a “tablespoons/liter” type of measurement somewhere in the package, for container plants.
If not, maybe the manufacturer has it on their website?