17
NUTRIENT SOLUTION
A rational fertilization program is required for optimum plant growth in greenhouses. pH value
of nutrient solution (water + fertilizer) has to meet plant needs.
If a fertigation system with automatic pH control is used, ensure that it is functioning properly.
Check the pH of the irrigation solution as well as of any recycled solution.
Table 3
tabulates optimum pH values for various plants.
ORCHARD PLANTS
Preferred pH Range
Preferred pH Range
Apple
5‑6.5
Orange
5‑7
Apricot
6‑7
Peach
6‑7.5
Cherry
6‑7.5
Pear
6‑7.5
Grapefruit
6‑7.5
Plum
6‑7.5
Grapevine
6‑7
Pomegranate
5.5‑6.5
Lemon
6‑7
Walnut
6‑8
Nectarine
6‑7.5
VEGETABLES AND HERBACEOUS CULTIVATIONS
Preferred pH Range
Preferred pH Range
Artichoke
6.5‑7.5
Pepper
6‑7
Asparagus
6‑8
Early Potato
4.5‑6
Barley
6‑7
Late Potato
4.5‑6
Bean
6‑7.5
Sweet Potato
5.5‑6
Brussels Sprout 6‑7.5
Pumpkin
5.5‑7.5
Early Carrot
5.5‑7
Rice
5‑6.5
Late Carrot
5.5‑7
Soybean
5.5‑6.5
Cucumber
5.5‑7.5
Spinach
6‑7.5
Eggplant
5.5‑7
Strawberry
5‑7.5
Lettuce
6‑7
String
6‑7.5
Maize
6‑7.5
Sugar Beet
6‑7
Melon
5.5‑6.5
Sunflower
6‑7.5
Oat
6‑7
Tomato
5.5‑6.5
Onion
6‑7
Watermelon
5.5‑6.5
Pea
6‑7.5
Wheat
6‑7
NUTRIENT SOLUTION
