Suitable Soil pH Range for Crops Growth
Oct 16, 2017

Soil pH is a measure of the acidity or basicity of a soil. pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H+ or, more precisely, H3O+aq) in a solution. In soils, it is measured in a slurry of soil mixed with water (or a salt solution), and normally falls between 3 and 10, with 7 being neutral. Acid soils have a pH below 7 and alkaline soils have a pH above 7. Ultra-acidic soils (pH<3.5) and very strongly alkaline soils (pH>9) are rare.

Soil pH is considered a master variable in soils as it affects many chemical processes. It specifically affects plant nutrient availability by controlling the chemical forms of the different nutrients and influencing the chemical reactions they undergo. The optimum pH range for most plants is between 5.5 and 7.5; however, many plants have adapted to thrive at pH values outside this range.

The following table only for reference:

Field Crops

CropsSuitable pH rangeCropsSuitable pH rangeCropsSuitable pH range
Rice6.0-7.5Barley6.3-7.0Canola5.8-6.7
Wheat5.5-6.5Sorghum6.0-7.0Sesame
6.0-7.0
Cotton6.5-8.0Peanut
5.6-6.0Alfalfa6.5-7.5
Corn6.5-7.0Sugar-beet
7.0-8.0Tobacco5.0-5.6
Soybean6.5-7.0Sugarcane6.0-7.5Tea5.0-5.5
Sweet Potato5.0-6.0Cassava5.0-6.0Mulberry5.0-7.0

Orchards

CropsSuitable pH rangeCropsSuitable pH rangeCropsSuitable pH range
Apple7.0-7.5Strawberry5.7-6.5Arabian Coffee4.0-7.5
Grape6.0-7.5Litchi
6.0-7.0Barbary Fig
7.0-8.5

Pear

5.6-7.2Cherry
6.5-7.5Mongo
5.5-7.5
Banana
6.0-6.5Citrus
5.5-6.5Guava
5.5-7.0
Peach
6.0-8.0Almond
6.8-7.9Blueberry
4.7-7.5
Pineapple
4.4-6.0Longan5.4-6.5Pomegranate
6.0-6.9

Vegetables

CropsSuitable pH rangeCropsSuitable pH rangeCropsSuitable pH range
Carrot
5.3-6.8
Potato5.5-6.5Onion6.0-6.8
Tomato5.5-7.0Watermelon5.0-7.0
Garlic5.6-6.0
Cucumber5.5-7.6Lettuce
6.0Ginger6.5
Cabbage5.5-6.7Celery
6.0-7.5Pumpkin
6.5-7.5
Pepper6.2-7.2Spinach5.5-7.0
Waxgourd
5.5-7.6
Eggplant6.8-7.3Broccoli6.0-6.7Konjak
6.5-7.5
Pea6.0-7.2Kidney Bean
6.2-7.0Cowpea
6.2-7.0