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  Electro - Conductivity Chart

Electro - Conductivity (EC) or Conductivity Factor (cF) can be expressed as either millisiemens (mS), cF or parts per million (ppm).

Example: 1mS = 10cF = 700ppm

The pH and Electro - Conductivity values specified here are given as a broad range. It should be noted that different seasons and climate will alter the needs of your plant. As a general rule, in cooler grow rooms, the plant requires higher nutrients. With warmer rooms, the plant requires lower levels of nutrients.

Vegetable Crops
L = Low     M = Medium     H = High
Product pH Category cF ppm
Artichoke 6.5 - 7.5 L 8 - 18 560 - 1260
Asparagus 6.0 - 6.8 L 14 - 18 980 - 1260
Bean (Common) 6.0 H 20 - 40 1400 - 2800
Beetroot 6.0 - 6.5 H 18 - 50 1260 - 3500
Broad Bean 6.0 - 6.5 M 18 - 22 1260 - 1540
Broccoli 6.0 - 6.8 H 28 - 35 1960 - 2450
Brussels Sprout 6.5 H 25 - 30 1750 - 2100
Cabbage 6.5 - 7.0 H 25 - 30 1750 - 2100
Capsicum 6.0 - 6.5 M 18 - 22 1260 - 1540
Carrot 6.3 M 16 - 20 1120 - 1400
Cauliflower 6.5 - 7.0 M 15 - 20 1050 - 1400
Celery 6.5 M 18 - 24 1260 - 1680
Cucumber 5.5 M 17 - 25 1190 - 1750
Eggplant 6.0 H 25 - 35 1750 - 2450
Endive 5.5 M 20 - 24 1400 - 1680
Fodder 6.0 M 18 - 20 1260 - 1400
Garlic 6.0 L 14 - 18 980 - 1260
Leek 6.5 - 7.0 L 14 - 18 980 - 1260
Lettuce 6.0 - 7.0 L 8 - 12 560 - 840
Marrow 6.0 M 18 - 24 1260 - 1680
Okra 6.5 H 20 - 24 1400 - 1680
Onion 6.0 - 6.7 L 14 - 18 980 - 1260
Pak - choi 7.0 M 15 - 20 1050 - 1400
Parsnip 6.0 L 14 - 18 980 - 1260
Pea 6.0 - 7.0 L 8 - 18 980 - 1260
Pepino 6.0 - 6.5 H 20 - 50 1400 - 3500
Potato 5.0 - 6.0 H 20 - 25 1400 - 1750
Pumpkin 5.5 - 7.5 M 18 - 24 1260 - 1680
Radish 6.0 - 7.0 M 16 - 22 840 - 1540
Spinach 6.0 - 7.0 M 18 - 23 1260 - 1610
Silverbeet 6.0 - 7.0 M 18 - 23 1260 - 1610
Sweet Corn 6.0 M 16 - 24 840 - 1680
Sweet Potato 5.5 - 6.0 H 20 - 25 1400 - 1750
Taro 5.0 - 5.5 H 25 - 30 1750 - 2100
Tomato 6.0 - 6.5 H 20 - 50 1400 - 3500
Turnip 6.0 - 6.5 M 18 - 24 1260 - 1680
Zucchini 6.0 M 18 - 24 1260 - 1680

Herbs
Product
pH
Category
cF
ppm
Basil
5.5 - 6.5
L
10 - 16
700 - 1120
Chicory
5.5 - 6.0
H
20 - 24
1400 - 1680
Chives
6.0 - 6.5
M
18 - 22
1260 - 1540
Fennel
6.4 - 6.8
L
10 - 14
700 - 980
Lavender
6.4 - 6.8
L
10 - 14
700 - 980
Lemon Balm
5.5 - 6.5
L
10 - 16
700 - 1120
Marjoram
6.0
M
16 - 20
1120 - 1400
Mint
5.5 - 6.0
H
20 - 24
1400 - 1680
Mustard Cress
6.0 - 6.5
M
12 - 24
840 - 1680
Parsley
5.5 - 6.0
L
8 - 18
560 - 1260
Rosemary
5.5 - 6.0
L
10 - 16
700 - 1120
Sage
5.5 - 6.5
L
10 - 16
700 - 1120
Thyme
5.5 - 7.0
L
8 - 16
560 - 1120
Watercress
6.5 - 6.8
L
4 - 18
280 - 1260

Flower Crops
Product
pH Category cF ppm
African Violet 6.0 - 7.0 L 12 - 15 840 - 1050
Anthuurium 5.0 - 6.0 M 16 - 20 1120 - 1400
Antirrhinim 6.5 M 16 - 20 1120 - 1400
Aphelandra 5.0 - 6.0 M 18 - 24 1260 - 1680
Aster 6.0 - 6.5 M 18 - 24 1260 -1680
Begonia 6.5 L 14 - 18 980 - 1260
Bromeliad 5.0 - 7.5 L 8 - 12 560 - 840
Caladium 6.0 - 7.5 M 16 - 20 1120 - 1400
Canna 6.0 M 18 - 24 1260 - 1680
Carnation 6.0 H 20 - 35 1260 - 2450
Chrysanthemum 6.0 - 6.2 H 18 - 25 1400 - 1750
Cymbidium 5.5 L 6 - 10 420 - 560
Dahlia 6.0 - 7.0 M 15 - 20 1050 - 1400
Dieffenbachia 5.0 - 6.0 H 18 - 24 1400 - 1680
Dracaena 5.0 - 6.0 H 18 - 24 1400 - 1680
Fern 6.0 M 16 - 20 1120 - 1400
Ficus 5.5 - 6.0 M 16 - 24 1120 - 1680
Freesia 6.5 M 10 - 20 700 - 1400
Impatien 5.5 - 6.5 M 18 - 20 1260 - 1400
Gerbera 5.0 - 6.5 H 20 - 25 1400 - 1750
Gladiolus 5.5 - 6.5 H 20 - 24 1400 - 1680
Monstera 5.0 - 6.0 H 18 - 24 1400 - 1680
Palm 6.0 - 7.5 M 16 - 20 1120 - 1400
Rose 5.5 - 6.0 M 15 - 25 1050 - 1750
Stock 6.0 - 7.0 M 16 - 20 1120 - 1400