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Ionic balance Cation charge: – mol⁺/L Anion charge: – mol⁻/L Balance (net load): – mol/L Calculated pH (charge balance): – ¹) Estimated pH (Realistic): – ¹) Estimated electrical conductivity (EC): – mS/cm |
Composition
| Element | Source | Is: g/L | Is: mg/L = ppm | Is: mol/Liter | Is: mmol/L | Target: g/L | Target: % | Δ g/L | Name |
|---|---|---|---|---|---|---|---|---|---|
| Al | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Aluminium (Al) | |
| B | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Boron (B) | |
| Be | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Beryllium (Be) | |
| C | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Carbon (C) | |
| Ca | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Calcium (Ca) | |
| Cl | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Chlorine (Cl) | |
| Co | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Cobalt (Co) | |
| Cu | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Copper (Cu) | |
| F | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Fluorine (F) | |
| Fe | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Iron (Fe) | |
| H | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Hydrogen (H) | |
| K | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Potassium (K) | |
| Li | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Lithium (Li) | |
| Mg | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Magnesium (Mg) | |
| Mn | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Manganese (Mn) | |
| Mo | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Molybdenum (Mo) | |
| N | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Nitrogen sum (N) | |
| NH4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Nitrogen (as NH₄⁺) | |
| NO3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Nitrogen (as NO₃⁻) | |
| Na | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Sodium (Na) | |
| O | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Oxygen (O) | |
| P | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Phosphorus (P) | |
| S | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Sulphur (S) | |
| Se | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Selenium (Se) | |
| Si | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Silicon (Si) | |
| Sn | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Tin (Sn) | |
| Ti | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Titanium (Ti) | |
| Zn | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Zinc (Zn) |
| In CVS format for Excel, etc. | |
| Recipe / Compilation | Content substances |
¹) Regarding the pH estimate: Jones, Sonneveld & Voogt, manufacturer data sheets (Yara, Haifa, ICL), various chemical databases
¹) Regarding the EC estimate: Lide, CRC Handbook of Chemistry and Physics
²) When fertilizer mixtures (NPK + X) are used, it is not possible to calculate the EC and pH because the composition is unknown.
The values used are then estimated - and can therefore be viewed as "fantasy". When it comes to empirical values, they are marked with (real).
³) In the case of fertilizer products, some of the nitrogen is sometimes added as urea. Since this cannot be used as NO₃⁻, it is added together with the NH₄⁺ part. No further differentiation (e.g. NH₂⁻/cyanamide) is made.
⁴) Not all manufacturers reveal the chemical composition or origin of the respective NPK components.
⁵) Contain nitrogen (N) only as NH₄⁺ or NH₂⁻ or not as NO₃⁻ - but: NH₄⁺ lowers the pH in the substrate. A maximum of 5–10% of total nitrogen for hydroponics should come from NH₄⁺. More is toxic to hydroponics!
⁶) This plant growth medium is generally used for the cultivation of plant cell cultures on agar. It is also used for growing microgreens. It is listed here because there are alternative recipes that can be created here. You can find the original recipe here: Murashige - Skoog medium
⁷) Fluorine is not an essential plant nutrient element. In most cases, fluorine (vs. Fluoride F⁻) is toxic to plants because it causes photosynthetic enzymes (e.g. B. RubisCO) inhibits, damages membranes and causes oxidative stress. However, plants such as tea, aloe or some ferns can absorb significant amounts. Recommended concentrations in nutrient solutions for testing purposes are below 1 mg/L, often in the range of 0.1–0.5 mg/L. (cf. Weinstein & Davison, 2004)
ⁿ) Nitrogen (N). Origin unknown. Possible sources: e.g. NH₄⁺/ammonium, NO₃⁻/nitrate, NH₂⁻/amide, CN₂H₂/cyanamide or organic/amino acids. Without manufacturer's information for finished fertilizers.
ᵖ) Phosphorus (P). Origin unknown. Without manufacturer's information for finished fertilizers.
ᵏ) Potassium (K). Origin unknown. Without manufacturer's information for finished fertilizers.
The two most important fertilizer types when it comes to nitrogen (N):
NO₃⁻: Is immediately available to plants because nitrate is absorbed directly from the roots: For hydroponics and soil
NH₄⁺: Must be nitrified into nitrate in the soil (only possible by microorganisms): For soil and aquaponics
The NPK information on fertilizers represents the three most important plant nutrients:
* N = Nitrogen (Nitrogen)
* P = Phosphorus (Phosphorus)
* K = Potassium (Potassium)
K₂O Potassium oxide itself is not used as a fertilizer (PK/NPK fertilizer), but is used there as a unit of measurement for the proportion of potassium (e.g. B. used in the form of potassium sulfate, potassium formate, potassium nitrate or potassium chloride) in fertilizer.
These values are in Weight percent specified, and in specific chemical forms:
1. N (Nitrogen)
Chemical form: The nitrogen content is considered elemental nitrogen (N) stated, independant of the chemical compound (e.g.B. NH₄⁺, NO₃⁻, urea).
- Example: 10% N means that 10 g of pure nitrogen is contained in 100 g of fertilizer.
2. P (Phosphorus)
Chemical form: P ₂O₅ (phosphorus pentoxide) – is given non-pure phosphorus (P).
- Example: 10% P ₂O₅ means 10 g P ₂O₅ per 100 g of fertilizer.
3. K (Potassium)
Chemical form: K₂O (potassium oxide) – is also stated non-pure potassium (K).
- Example: 10% K₂O means 10 g K₂O per 100 g of fertilizer.
Example NPK information:
NPK 10-5-8 means:
- 10 % Nitrogen (N)
5 % Phosphorus Pentoxide (P ₂O₅)
8 % Potassium oxide (K₂O)
That corresponds to:
- 10 g N
5 g P₂O₅ ≈ 2,18 g P
8 g K₂O ≈ 6,64 g K
per 100g of fertilizer
Sources:
Marschner, P. (2012): Marschner's Mineral Nutrition of Higher Plants, 3rd Edition, Academic Press. -> “NPK values are expressed in oxide forms for P and K (P₂O₅ and K₂O) for historical reasons and ease of comparison.”
Mengel, K., & Kirkby, E. A. (2001): Principles of Plant Nutrition, 5th Edition, Kluwer Academic Publishers.-> “The amount of nutrient applied is usually reported in oxide equivalents, not elemental form.”
Special areas: Titanium, tin and beryllium are controversial and/or of experimental or toxicological concern. Here the literature partially contradicts itself. They are listed for completeness. No guarantee!
Lizenz: GNU GPLv3 (CopyLeft), Autor: Helmer Borgmann
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