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Tomato fertilization questions

3 months ago

According to a google search, you need 134-145 ppm N for "protected cultivation of tomatoes". Let say its 140ppm as an example, and let's assume we are using a soiless medium to grow the tomatoes (to simplify).

(1) If I understand that correctly, this means that I need to add 140ppm (i.e. 280lbs/acre) of Nitrogen to my plants. Is this correct?

(2) How in the world did they come up with that 134-145 ppm N figure? I saw in the following link:

that a "normal" percentage dry weight of nitrogen on tomatoes plants should be 3.75%. But, how does that help us know how much Nitrogen to add?

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