Boost does not replace the profile, but modifies the current one:
P-boost — sets P=40 ppm to stimulate flowering. Maximum 3-5 days! High P blocks Ca/Mg/Fe.
K-boost — increases K by +20% for fruit ripening. Maximum 5-7 days.
Ca-boost — increases Ca by +20% for blossom end rot prevention.
After boost, return to the base profile!
Profile
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Journal is empty. Add your first entry!
Solution
mS/cmSalt prices
Base— mS/cm
Эмпирическая оценка по NH₄, K, Ca и Mg при 25 °C.
Ионы— mS/cm
Сумма ионных проводимостей с поправкой на ионную силу при 25 °C.
База+микро— mS/cm
База и известные катионы микроисточников. Неизвестный состав не оценивается.
Цель EC изменяет макро; микро сохраняются. Расчётные оценки проверяйте EC-метром.
PPM
pH расч.pH
Осм. давлениеπ, бар
bar
Last update
π (bar) ≈ 0.36 × EC. For the root to absorb water its internal pressure must be higher than the solution pressure outside. At too high an EC water stops entering — the plant wilts even when watered. In hot weather this is doubly critical.
EC
π (bar)
Crop
Status
0.5–1.0
0.2–0.4
Seedlings, strawberry
↓ Low
1.5–2.0
0.5–0.7
Greens, cucumber
✓ Normal
2.0–2.5
0.7–0.9
Tomatoes, cucumbers, peppers
✓ Normal
2.5–3.5
0.9–1.3
Flowers and ornamentals
○ Acceptable
3.5–5.0
1.3–1.8
Rose, tomato stress
⚠ Stress
5.0–7.0
1.8–2.5
All micro salts
⚠⚠ Universal starter
>8.0
>2.9
Any
✗ Critical
💡 In hot weather a plant transpires more water — the same EC creates more stress.
ECion — calculated EC by ions
Computed from the ionic concentrations (NO₃⁻, H₂PO₄⁻, SO₄²⁻, NH₄⁺, K⁺, Ca²⁺, Mg²⁺, Fe²⁺, Cl⁻) using the Debye–Hückel method — accounting for the activity of ions in solution.
Это оценка проводимости при 25 °C по рассчитанному составу раствора. Изменение навесок меняет ионный EC.
Поле EC и EC по ионам рассчитываются разными моделями и могут различаться. Их совпадение не доказывает ионный баланс. Для готового раствора проверяйте EC прибором.
Основной EC использует эмпирическую формулу по NH₄, K, Ca и Mg с добавлением катионов известных микроисточников. Неизвестные формы и комплексы отмечаются в предупреждениях как неполный расчёт. При изменении EC микронавески остаются фиксированными. Ионная модель условно представляет железо как Fe²⁺ и не описывает реальные хелаты; при большом хелатном Fe её оценка ненадёжна.
Расчётный pH
Выберите модель: исходная формула NH₄/N с поправкой на кислоты или регрессии HENS / Ямасаки из EP3786617B1 (таблица 1). Температура принята 25 °C.
Исходная формула: pH = 6,5 − 2×NH₄/(NO₃+NH₄) − 0,4×кислоты в мэкв/л. Вклад кислот считается один раз из навески и концентрации; азот кислоты уже входит в NO₃.
Эти оценки не учитывают щёлочность воды, карбонатный буфер и CO₂. Патентные регрессии получены для конкретных рецептур на дистиллированной воде. Проверяйте результат pH-метром.
Строка обмена и NPK
Macro0Micro:0Total:0
Diagnostics
K:N
1.0-2.5
K:Ca
0.8-2.0
K:Mg
3.0-7.0
Ca:Mg
2.0-4.0
NO3:NH4
5-251 к 14
Ion activity
Ca²⁺γ=--ppm
Mg²⁺γ=--ppm
Ion activity
The root absorbs not the amount of an ion in solution but its activity — the real «available» fraction. In a saturated solution ions interfere with each other and their activity is lower than the concentration. The γ coefficient (Debye–Hückel) shows this correction: at EC=1.5 γ≈0.45 for Ca²⁺, at EC=3.0 γ≈0.35.
Element
Optimum
Min.
Critical
Ca²⁺ act.
80–120 ppm
60 ppm
<40 ppm
Mg²⁺ act.
20–40 ppm
15 ppm
<12 ppm
💡 Even at the «correct» Ca/Mg ppm a plant may experience a deficiency — if the EC is too high, activity drops.
These are recommendations, not rules. A red indicator is a reason to pay attention, but an experienced agronomist may knowingly go beyond the limits.
Matrix
N
P
K
Ca
Mg
S
N
1
-
-
-
-
P
-
1
-
-
-
-
K
-
1
-
Ca
-
-
1
-
Mg
-
-
1
-
S
-
-
-
-
-
1
Water / Acids
CaCaO0ppm
MgMgO0ppm
SSO₃0ppm
FeFe₂O₃0ppm
KK₂O0ppm
PP₂O₅0ppm
g0ppm K
Щёлочность: 0 meq/L · pH расч. —
Гидрокарбонат калия: навеска на объём раствора. Калий учитывается в рецепте, щёлочность — в исходной оценке pH.
HNO₃
%
g
ml
0 ppm N
H₃PO₄
%
g
ml
0 ppm P
H₂SO₄
%
g
ml
0 ppm S
Macroelements
+ 0 meq- 0 meq
Направление питанияИсходный состав
Подробнее о корректировке
«Рост» уменьшает K относительно N, «Плоды» увеличивает. Шаг считается от текущего состава. «Исходный» возвращает рецепт, который был при открытии профиля.
До применения показаны изменения элементов и расчётного EC. Связанные элементы и навески пересчитываются выбранными солями; EC может измениться. Изменение можно отменить.
Направление задаёте вы: соотношение N:K само по себе не определяет стадию растения. Шаг — величина изменения, а не норма питания.
Фосфор нужен и при плодоношении, но автоматически повышать его в каждом рецепте не требуется. В исследовании томата без почвы использовали P 40–50 мг/л; это пример для конкретных условий, а не универсальная нижняя граница. Источник и условия опыта.
Результат пересчёта выбранными солями:
N:
NO3NH4PKCaMgSCl
Salts
Salt
All
Composition %
Price
Ca(NO₃)₂·4H₂O
Ca
NO₃
NH₄
KNO₃
K
NO₃
NH₄
NO₃
MgSO₄·7H₂O
Mg
S
KH₂PO₄
K
P
K
S
Mg
NO₃
Ca
Cl
🧪 Не хотите смешивать соли сами?
Закажите готовые концентраты А и Б под текущий профиль — от 100 л рабочего раствора.
Каждая соль растворена в своей бутылке. На карточке — сколько граммов в бутылке и её объём (нажмите на число, чтобы изменить), плотность, остаток и на сколько бутылки хватит. Тип соли и проценты — в таблице «Соли» (нажмите на название соли). Замешивают раствор в разделе «Концентраты».
Название концентрата и режим микро. Граммы и объём бутылок правятся прямо на карточках.
Учёт остатков, журнал и миксер — после входа.
Sign In
Как работает учётБудем списывать расход при каждом замесе и подскажем, когда бутылка кончается.
Main principle: everything is calculated per 1 liter
The salts table shows grams per 1 litre of ready solution (the «Weight» column). To prepare a tank or a concentrate, use the «Concentrates» section: it multiplies grams per litre by your volume and gives the total grams.
Pick a recipe — кнопка «Профили»: культура и субстрат, вкладка «Сообщество» — рецепты других гроверов. «Применить» — нормы подставятся, граммы посчитаются
Set EC and water — EC is the strength of the solution; your tap water composition goes to «Water / Acids», the calculator subtracts it
Check the salts — in «Salts» pick the salt type and the percentages from the package (for nitrates, clicking «N» opens NO₃ and NH₄); price — click the «Price» cell
Bottles and mixing — keep salts dissolved in bottles — set them up in «Mono concentrates»; the batch volume «A/B: N l» and how much to pour — in «Concentrates»
Save — the «Save» button in the header (Ctrl+S); «Journal» — pH, EC, photos; GrowBox mixer — «Make N l» in «Concentrates»
Section help — the (?) next to its title
Every section (Solution, Water / Acids, Macronutrients, Diagnostics, Salts, Micronutrients, Mono concentrates, Concentrates, Corrector, Journal) has a (?) next to its title — help for that section. The «Tutorial» button on the toolbar is a short step-by-step tour of the page.
Macroelements
Target mg/l of the solution: N (nitrate NO₃ and ammonium NH₄), P, K, Ca, Mg, S, Cl. A ready recipe fills them in; change them and salt grams are recalculated. The button next to the title switches units: PPM / mmol / meq.
«+ meq» and «− meq» in the header are the sums of cations and anions. If they do not match, a plain-language note below the table explains why and what to fix.
Sulfur: if the selected salts cannot give the target S, the note below the table says what is set, what you will get, why, and what to do (less K or Mg, more NO₃, a chloride).
Diagnostics: element ratios
The ratios show the balance between elements. These are RECOMMENDED ranges that depend on:
Coco coir has a cation-exchange capacity (CEC). It «takes» Ca, Mg, K from the solution. That's why in a coco profile Ca and Mg are 20-30% higher than for hydroponics.
Rockwool features
Rockwool is an inert substrate with a very low CEC. New rockwool has a high pH (7-8) and needs flushing with a pH 5.5 solution. It can accumulate salts with poor drainage — monitor the drainage EC. The profile is close to hydroponics, but with slightly higher Ca to buffer the high pH of new wool.
Light type
expanded clay — inert, large fraction, excellent drainage. Profile like for hydroponics.
Perlite — inert, light, good drainage. Often mixed with other substrates.
Vermiculite — retains water and has CEC. Add 10-15% Ca/Mg as for coco.
Peat — has CEC and acidic pH. Requires liming and increased Ca/Mg.
Hydroponics — pure hydroponics, standard profile.
Table
For each salt you can enter the percentage composition manually or pick from a list of ready brands (Fertika, Yara, Master, etc.).
Weight — grams per litre
The «Weight» column shows how many grams of the salt are needed per 1 litre of ready solution. It is the base unit of all calculations.
Go to Shop
The «Concentrates» section (bottom of the page) multiplies «Weight» by the volume. Set 10 l — get grams for 10 l, 100 l — for 100 l. The salts table itself is always per 1 litre.
Units mg/g — auto-switch
Small amounts (< 1 g/l) are shown automatically in milligrams (mg) to avoid weighing errors:
0.500 g/L → shown as «500 mg»
When entering in mg mode, spinner arrows step by 1 mg
When crossing 1 g — it automatically switches back to g (1.00 g)
Enter percentages from the package
Packages list N, CaO, K₂O, MgO. The calculator needs Ca, NO₃, NH₄, etc. Click «?» in the header of the «%» column — there are detailed conversion formulas there.
У селитр с двумя формами азота (кальциевая, аммиачная) в «Составе %» одно поле «N» — общий азот. Щелчок по нему открывает NO₃ и NH₄; ушли с полей — снова одно «N». На телефоне: тап раскрывает оба поля, колесо открывает тап по нужному.
Кальциевая селитра с аммонием: к аммонию добавлен свой нитрат (NO₃ 12,56 % у 4-водной) — соль электронейтральна. У профилей, сохранённых раньше, пометка о разнице мэкв и кнопка «Пересчитать NO₃»; сами профили не меняются.
A percentage higher than a pure salt can have is not saved — the hint names the usual cause (nitrogen as the ion instead of N, oxide instead of the element).
Element Compatibility
Ca = CaO ÷ 1.4 | K = K₂O ÷ 1.2 | Mg = MgO ÷ 1.66
N = NO₃ + NH₄
Price
The «Price» cell shows the cost of the dose (kopecks or roubles). A click opens the salt price: enter it per 1 kg or per 1 g, the other is calculated. Until you enter your own, a typical salt price is used. On a phone the price is the last column (the table scrolls sideways), a tap opens the same card. The same for micronutrients.
Solution
When you enter g/l in a salt field, a hint with the maximum solubility at 20°C appears. If the value is low, a ⚠️ warning appears next to it.
K:Ca Ratio
Calculated automatically from the entered element values. Color coding:
■ Green — within range for the selected substrate
■ Yellow — acceptable deviation
■ Red — outside the recommended range
Parameters panel (sticky)
При прокрутке страницы вниз строка параметров (EC, PPM, ECion, pH, π) автоматически фиксируется в верхней части экрана.
PPM is the total concentration of macronutrients in mg/l, calculated automatically from the entered values.
Last update
π ≈ 0.36 × EC. Shows the physical pressure of the solution — the higher it is, the harder it is for the root to absorb water. Click ⓘ next to «P» — a table of norms for different crops opens.
EC
π (bar)
Crop
Status
0.5–1.0
0.2–0.4
Seedlings, strawberry
↓ Low
1.5–2.0
0.5–0.7
Greens, cucumber
✓ Normal
2.0–2.5
0.7–0.9
Tomatoes, cucumbers, peppers
✓ Normal
2.5–3.5
0.9–1.3
Flowers and ornamentals
○ Acceptable
3.5–5.0
1.3–1.8
Rose, tomato stress
⚠ Stress
5.0–7.0
1.8–2.5
All micro salts
⚠⚠ Universal starter
>8.0
>2.9
Any
✗ Critical
ECion
Оценка EC по известному ионному составу при 25 °C. Молярная проводимость каждого иона учитывается один раз; активность рассчитана по Дебаю–Хюккелю.
Поле EC и EC по ионам рассчитываются разными моделями и могут различаться. Их совпадение не доказывает ионный баланс. Для готового раствора проверяйте EC прибором.
Расчётный pH
Расчёт при 25 °C по выбранной модели: исходная, HENS или Ямасаки. Выбор сохраняется с рецептом и не меняет навески. Щёлочность и карбонатный буфер не учтены; точность для произвольного состава не гарантируется.
EC when a profile opens
If the EC saved in a profile no longer matches its composition, the EC from the composition is shown on opening — the same as after any edit.
Saving
«Saved» — everything is saved
«Save» with a number — there are edits (the number is how many fields changed); save with a click or Ctrl+S
The button is in the header and in the sticky panel while scrolling. Without signing in — «Sign in to save»: until then everything is kept in this browser.
Concentrates (g/L)
⚠️ Why not complex?
Ca²⁺ (concentrate A) and SO₄²⁻/PO₄³⁻ (concentrate B) form an insoluble precipitate when mixed in concentrated form. In the working solution (1:100+ dilution) they are compatible.
Reset Grafana user
In the section header set two fields: «A/B» — a single volume for concentrates A and B; «C» — the micro concentrate volume (100 l and 1000 l by default)
Calculator will show final grams of each salt for the specified volume
Mono bottles (and the micro bottle) are set in the «Mono concentrates» block — here are their ml for the whole volume
The «Concentrates» section header has a «Maximum» button — it calculates the maximum possible concentrate: how many grams of salt can be dissolved into the container up to the solubility limit. Useful for optimizing storage.
Flowers and ornamentals
Warm water (30C for A/B, up to 100C for mono) - salts dissolve faster
Dissolve one salt at a time, rinse container between components
Label bottles (A/B, date, density), store in dark at +5...+25C
PPE: gloves, goggles; do not inhale salt dust
To check: weigh 100ml of finished solution. Density = mass/100
Bottle stock tracking
Bottles are set in the «Mono concentrates» block: grams and volume of each right on its card (with no concentrate selected these are «Bottles of this calculation»). To know what is left, turn on tracking there («Start tracking stock», sign-in required). Then a table appears here above the tanks: how much to pour from each bottle for «A/B: N l» and whether it is enough. On the bar green stays, yellow goes into this batch, red is missing. When poured — «Mixed N l — write off»: stock goes down and the batch is logged in the grow journal. Details — the «?» in the «Mono concentrates» block.
Water and acids
The «Water / Acids» section accounts for the mineral composition of tap water and the addition of acids to lower pH. The calculator automatically subtracts the water elements from the profile's target values.
The section collapses by clicking its title; when collapsed it briefly shows what is set: water elements and acids.
«Water» tab
Enter the element content of your water (Ca, Mg, K, S, Na, Cl, HCO₃, etc.). The data comes from a water analysis — usually given in mg/l or ppm. You can enter either % (the oxides column) or ppm.
How to read the table
Hard water contains Ca and Mg — without accounting for it you'll get an excess of these elements in the solution. High HCO₃ (carbonate hardness) buffers pH and requires neutralization with acid.
Water / Acids
To lower the solution pH, one of the acids can be added:
Acids
Effect
Humidity
HNO₃
↓ pH
Adds N — account for in balance
H₃PO₄
↓ pH
Adds P — account for in balance
H₂SO₄
↓ pH, ↓ HCO₃
Adds S, neutralizes carbonates
После добавления кислоты проверьте расчёт и измерьте pH
Расчётный EC и pH обновляются по составу. Модели не учитывают нейтрализацию щёлочности воды; проверяйте раствор прибором.
Microelements
The «Micro» section lets you set micronutrient doses: Fe, Mn, Zn, Cu, Mo, B, Co, Si. By default values are shown in ppb (µg/l). Use the button next to the «Micronutrients» heading to switch units: ppb → ppm → µmol.
Total microelements:
In the table: mg/l (= ppm). In ppb mode (default) multiply by 1000 — e.g. Fe 1–3 mg/l = 1000–3000 ppb.
Element
Normal
Role
Fe
1.0–3.0
Chlorophyll, respiration
Mn
0.5–1.0
Tools
Zn
0.1–0.5
Vapor Pressure Deficit
Cu
0.05–0.15
Additional options
Mo
0.05–0.1
My concentrate
B
0.2–0.5
Last update
Co
0.01–0.05
Nitrogen fixation, vitamin B12 in plants
Si
50–150
Cell wall strengthening
Total microelements:
Fe and Mn compete — an excess of one blocks the other. Excess Cu suppresses Fe and Mn. High P blocks Zn and Fe. Click the «Compatibility» button (🛡) on the toolbar for the full table.
Three modes of micro calculation
Salts (chelates) — each element is set by a separate salt: Fe-EDTA 13%, MnSO₄, H₃BO₃, etc. The table shows the salt type, % content, weight/l. The «Composition» row shows the % of each element in the dry fertilizer mix (as on a label).
Complex — one ready-made micro product (bottle): enter the grams and the % of each element in it. Calculated for the concentrate volume.
Salts + Complex — combined mode: part of the micro is from individual salts, part from a ready complex. The «Composition» row shows three lines: «Salts», «Complex» and «Total».
Dry mono micro («Salts» mode)
For each element choose a salt type from the dropdown (Fe-EDTA, Fe-DTPA, MnSO₄, H₃BO₃, etc.) and, if needed, adjust the element's % content. The calculator will compute the salt grams per liter of working solution.
Liquid micro («Complex» mode)
Enter the total grams of the product per liter and the % content of each element in it. The «Concentrate C» section under «Concentrates» will show how many grams or ml are needed for your volume.
В таблице микро — тип соли, %, вес на 1 л и цена; бутылки микро (одна на всё или по элементам) — в «Моно-концентраты».
Tools
В панели под шапкой — «Профили» и «Меню». В меню находятся переключение темы, настройки, справка, обучение, сброс, обмен состоянием, совместимость и печать.
Solution corrector
The «Corrector» section is below the concentrates. It lets you adjust an already-prepared solution without draining it:
Enter the current solution composition (the «Current» column) or click ↓ next to the «Current» header — it fills from the profile
Enter the desired composition (the «Target» column), or click ↓ next to the «Target» header — it fills from the profile
The calculator will show in the «Corr.» column how much to add (+ add / − excess)
Each column has an ↑ «Apply to profile» button: ↑ at «Corr.» — apply the corrected result as a new profile; ↑ at «Current» or «Target» — apply that column's values directly
-- not selected --
If you have a GrowBox mixer connected, «Concentrates» has a «Mixer» row:
«Make N l» — send the recipe to the mixer, volume as «A/B: N l»
«Pump setup» — which salt is on which pump (p1–p8)
Along with the grams the mixer gets the recipe name, profile number, EC and N-P-K — and shows the full recipe
Mono bottle stock tracking can be paired with the mixer («Paired with mixer»): it writes off what it pours
Journal
The «Journal» button in the header (sign-in required) — grow history:
Record pH, EC, temperature with timestamp
Preparing concentrate
Profile snapshot at recording time («+ profile» checkbox)
Filter by event type and device
Publish to community recipe database
Exchange string
The «Exchange string» is under the solution cards, open «Exchange string and NPK». It shows the full ionic composition in one line — macro and micro ppm: NO3= NH4= P= K= Ca= Mg= S= Fe= Mn= B=... ppm. The 📋 button next to it copies it. Handy for forums and comparing recipes.
Open for all
The 🖨️ button on the toolbar generates a printable version of the profile: the salt table, grams, concentrates and the preparation steps on one sheet.
Element Compatibility
The 🛡 button on the toolbar — a table of antagonisms and synergies. Useful with micro deficiencies: high P blocks Zn and Fe, excess K interferes with Ca and Mg.
Community Recipes
«Ready recipes» has a «Community» tab — recipes of other growers with photos and descriptions. «Apply» loads the recipe into the calculator.
Calibrate pH and EC meters. If necessary - water treatment
Specify salt composition (% elements from package). Example: CaO~27%, N~14.9%, NH4~0.2%
Calculate profile: target macro/micro and ratios (K:N, K:Ca, K:Mg)
Prepare concentrates A, B and Micro for the given volumePrepare concentrates A, B and Micro for the specified volumePrepare concentrates: macro for 100L, micro for 100L (or from dry salts)
Measure with scales (g) or syringe (ml). Use density for ml to g conversion
Assemble A and B: Ca separate from phosphates/sulfates, dissolve one at a time
pH can be adjusted by NH4:NO3 ratio (more NH4 = more acidic)
Monitor EC, dilute with pure water if necessary
Don't discard solution - use Corrector to adjust
Keep a journal: save profile, photos and comments
Tips
Hard water - use RO or reduce alkalinity with acid
Watch the osmotic pressure in the panel — at high EC in hot weather the stress is doubled
ECion ≠ EC? Review the salt % — there may be a mismatch with the real composition
Weigh small salt doses (mg) on jewelry scales (0.01 g accuracy)
Mono concentrates: how to use and how to prepare
What mono concentrates are and why
A mono concentrate is one salt dissolved in its own bottle in advance: calcium nitrate in one, potassium nitrate in another, magnesium sulfate in a third and so on. You dissolve once — then mix any recipe in millilitres, without weighing.
Fast: no need to weigh and dissolve dry salts every time — measure ml from the bottles and you are done.
Precise at small volumes: 0.15 g of salt is hard to weigh, 1.3 ml of solution is easy.
No precipitate: calcium is kept apart from sulfates and phosphates — in its own bottle it has nothing to precipitate with.
Any recipe from one set: change the profile — only the millilitres change, the bottles stay the same.
You see what runs out: stock tracking writes off what you pour and tells how many litres are left.
1. How to prepare a bottle
The salt card says how many grams are in the bottle and its volume: «570 g in 1000 ml». Dissolve the grams in part of warm water, after full dissolution top up with water to the bottle volume. The card also shows the density (g/ml): 100 ml should weigh density × 100 g. If the concentration is above the recommended limit the card warns you — it may precipitate when cold.
2. What is edited here and what in «Salts»
Grams and bottle volume are edited right on the card: click «400 g» or «500 ml», type a number and press Enter — it is saved at once, density and «lasts for» are recalculated. Esc cancels. When editing the volume there are 100 · 250 · 500 · 1000 · 2000 ml buttons under the field, when editing grams — «recommended up to X g» and a «set» button. Above the recommended concentration the density line turns orange, above solubility — red («will not dissolve»). While no concentrate is selected the header shows «Bottles of this calculation»: card edits go straight into the calculation, and «New concentrate» saves these bottles under a name. Concentrates are switched there too: click the name — a list (the selected one goes into the calculation at once), «New concentrate», «Rename» and «Delete». Without signing in everything is kept in this browser; stock tracking, journal and mixer after sign-in. After sign-in the block offers to move concentrates from the browser to your account. The salt type and its percentages (Ca, NO₃, NH₄…) are edited in the «Salts» table — click the salt name on the card
You changed a concentrate but the profile was saved earlier — on opening the profile the block says «concentrate changed» and offers «Recalculate from concentrate». The calculation itself does not change silently. A mixer linked to the concentrate uses the new g/l at once.
3. Micro: one bottle or per element
«One bottle» — a ready micro concentrate: enter the bottle volume and how many litres of solution it is for (a litre for 1000 l is 1 ml per litre). «Per element» — each element (Fe, Mn, B…) has its own bottle and recipe.
4. How to mix
Mixing is done in the «Concentrates» section below (the «Mix → to «Concentrates»» link on the card). Enter the volume in «A/B: N l» — the section shows how many millilitres to pour from each bottle and, if tracking is on, whether the stock is enough. Bar colours:
green — stays in the bottle after the batch;
yellow — goes into this batch;
red — not enough: the row is highlighted, below it says how many litres it will last.
When poured — «Mixed N l — write off» and confirm: stock goes down by exactly the shown ml and «Solution change» is logged in the grow journal. Made a mistake — «Undo» in the «Operations log».
5. Stock tracking
«Start tracking stock» — enter how many ml are in each bottle now (250 · 500 · 1000 · 2000 or your own). The cards get a stock bar and ✎: enter how much is in the bottle now (or «Full», «Half»…) — the journal records «corrected: was → now». The card also shows how many litres of solution the stock lasts for the current calculation.
6. Mixer
If a mixer is selected in «Concentrates» (the same one as for «Make N l»), tracking is paired with it: stock follows the mixer bottles, it writes off what it pours, refills are done on the mixer.
How to dissolve a salt and top up to the mark — the «Preparation» tab.
Edit fertilizer
⚠️ Why not complex?
Ca²⁺ from concentrate A and SO₄²⁻/PO₄³⁻ from concentrate B form an insoluble precipitate when mixed in concentrated form. In the working solution (1:100+ dilution) they coexist safely.
А
Concentrate A
Ca(NO₃)₂, KNO₃, NH₄NO₃, Mg(NO₃)₂, CaCl₂
Weigh all salts A according to calculation
Mark the level — fill water to the A/B container volume (usually 100 l) and make a mark
Pour into container
Top up to volume, stir. Calculate density (mass/volume)
Fill with water and bring to mark
💡 Ca(NO₃)₂ dissolves well even in cold water. NH₄NO₃ — in hot.
Б
Concentrates (g/L)
MgSO₄, KH₂PO₄, K₂SO₄
Weigh salts B according to calculation
Dissolve in a separate container — not in container A!Dissolve in a separate container — not in container A!
MgSO₄·7H₂O dissolves well in hot water (~50°C)
KH₂PO₄ dissolves slower — mix thoroughly
Bring to 1 liter
⚠️ Never mix A and B in concentrated form — precipitation will occur!
В
Preservative for microelements
Fe, Mn, Zn, Cu, Mo, B, Co, Si
Weigh micro-salts or measure complex chelate according to calculation
Dissolve in a separate container C — the volume is shown in the calculator (usually 1000 l)
For chelates (EDTA) — use water 20–40°C, not boiling
Bring to 1 liter
💡 A chelated complex (Plantafol, Master, etc.) can be dissolved separately and added to tank C.
Preparing concentrate
Weigh the salts → mark the container volume level → pour out the water → add the salts
Fill with water and bring to mark
To check: weigh 100ml of finished solution. Density = mass/100
Weigh the salt How to work with calculator
Weigh the salt Fill with water and bring to mark
Pour out the water Pour into container
Pour hot water (~60-80°C) to 2/3 of the volume
until completely dissolved Pour hot water
Bring to 1 liter until completely dissolved
Preservative for microelements
Micro concentrate is prone to microflora growth. Add preservative:
Potassium sorbate - 1-2 g per liter (safe for plants)
Sodium benzoate - 1 g per liter (alternative)
Density check
To check: weigh 100ml of finished solution. Density = mass/100
Example: 600 g/L CaNO3 gives density ~1.35 g/ml. If sediment - supersaturation, reduce concentration.
they go through a moderation process.
How to read the table
Packages list N (total nitrogen) and CaO (calcium oxide), while the calculator uses Ca, NO₃ and NH₄ separately.
Adjust Ca, NO₃, NH₄ to match the package:
Conversion formulas
N = NO₃ + NH₄
CaO = Ca × 1.4 (or Ca = CaO ÷ 1.4)
Potassium nitrate
On the package: N 17%, CaO 32%
Loading calculator...
Ca: 32 ÷ 1.4 = 22.9% → Shopping Cart CaO = 32%
NO₃: 16.8%
NH₄: 0.2%
Shopping Cart N = 17% ✓
All conversion factors
Element
Oxide
Copy
Ca
CaO
× 1.40
K
K₂O
× 1.20
Mg
MgO
× 1.66
P
P₂O₅
× 2.29
S
SO₃
× 2.50
Effect of crystallization water
Preservative for microelements
Form
Ca
N
Ca(NO₃)₂ anhydrous
24.4%
17.1%
Ca(NO₃)₂·H₂O
22.0%
15.4%
Ca(NO₃)₂·4H₂O
17.0%
11.9%
Element Compatibility
Macro
NH₄→P⊗Ca,Mg
NO₃→Ca,Mg
P→K⊗Zn,Fe
K⊗Ca,Mg
Ca→NO₃⊗K,Mg
Mg⊗K
S⊗Mo
Micro
Fe→Mn⊗Zn,Cu
Zn⊗Fe
Cu→Fe⊗Mn
Mn→Fe⊗Cu
Mo⊗S
B→Ca
→ helps absorption
⊗ blocks
Open for all
Calculate Solution
ProfileOHPG
EC:- mS/cm | g/vol- L
OHPG - Nutrient Solution Calculator
1 Tutorial Videos
Order matters: always dissolve the salts one by one, fully dissolving each before adding the next
Temperature in °C use warm water (30-40°C) for better dissolution. For concentrates 60-80°C is fine
Reason (optional) NEVER mix concentrated calcium solutions with sulfates and phosphates — a precipitate will form!
Precision use accurate scales (0.01 g for micro, 0.1 g for macro). An error of ±5% is acceptable
Water use reverse osmosis or soft water. Hard water will add extra calcium and magnesium
Comparison use the ready solution within a week. Concentrates keep for months in a dark place
2 Preparing micro complex
The simplest method for small volumes. Suitable for home use.
Pour 4 liters of warm water into the container (leave room for top-up)
Взвесьте каждую соль по колонке «Вес» в таблице «Соли» (граммы на литр) и умножьте на объём
Add salts in order, mixing until fully dissolved:
First calcium nitrate (Ca(NO₃)₂)
Potassium nitrate (Yara)
Magnesium sulfate (alt.)
Monopotassium phosphate
EC Calculator
Add the micronutrients (dissolved separately in a small amount of water)
Bring to 1 liter
Check EC and pH, adjust if necessary
3 Preparing concentrate
Concentrates are convenient for preparing solution repeatedly. Usually a x100 or x200 concentration is made.
Concentrate B
Contains calcium and part of the nitrogen. Volume 1 liter at x100:
Potassium nitrate tech.
Iron chelate (Fe-DTPA or Fe-EDTA) can be added
Concentrate B
Contains phosphates, sulfates, other elements. Volume 1 liter at x100:
Potassium nitrate
Potassium sulfate
Monopotassium phosphate
Potassium sulfate (Yara)
Microelements
Copy add 10 ml of each concentrate per 1 liter of water (at x100). First A, stir, then B.
4 Моно-концентраты — что это и зачем
Моно-концентрат — это раствор одной соли. Даёт максимальную гибкость в корректировке рецепта.
Преимущества моно-концентратов:
Density: you can change element ratios without recalculating the whole recipe
pH Adjustment easily add a missing element based on analysis results
Density: Select concentrate to apply or edit
Precision measure liquid more precisely than weighing small amounts of dry salts
Prepare
Определите рецепт бутылки для каждой соли — сколько граммов довести до какого объёма: см. карточки в блоке «Моно-концентраты»
Mark a line on the container (usually 0.5L or 1L)
Pour into container
Pour hot water
until completely dissolved
Cool and bring to the mark with cold water
Label the container: salt name, concentration, date
Copy сколько мл налить из каждой бутылки, пишет раздел «Концентраты» (блок «Хватит ли бутылок»).
5 Сборка концентратов А и Б из моно-концентратов
Комбинированный подход: храните моно-концентраты, а перед использованием собирайте А и Б.
My concentrate
Pour the weighed amount into container of required volume
Добавьте моно-концентрат кальциевой селитры (отмерьте по таблице)
При необходимости добавьте моно-концентрат хелата железа
Bring to 1 liter
My concentrate
Pour the weighed amount into container of required volume
Добавляйте моно-концентраты по очереди:
Potassium nitrate
Potassium sulfate
Monopotassium phosphate
Potassium sulfate
Microelements
Fill with water and bring to mark
Tips this approach lets you quickly reassemble concentrates for a different recipe without preparing the salts again.