Chloride Tolerance of Agricultural Crops

Maas (1990) (a)


- List in order of increasing tolerance -

Crop Threshold (a); mol/m3 Slope (a); %per mol/m3
Strawberry 10 3.3
Bean 10 1.9
Onion 10 1.6
Carrot 10 1.4
Radish 10 1.3
Lettuce 10 1.3
Turnip 10 0.9
Rice, paddy (b) 30 (c) 1.2 (c)
Pepper 15 1.4
Clover, strawberry 15 1.2
Clover, red 15 1.2
Clover, alsike 15 1.2
Clover, ladino 15 1.2
Corn 15 1.2
Flax 15 1.2
Potato 15 1.2
Sweet potato 15 1.1
Broadbean 15 1.0
Cabbage 15 1.0
Foxtail, meadow 15 1.0
Celery 15 0.6
Clover, Berseem 15 0.6
Orchardgrass 15 0.6
Sugarcane 15 0.6
Trefoil, big 20 1.9
Lovegrass 20 0.8
Spinach 20 0.8
Alfalfa 20 0.7
Sesbania (b) 20 0.7
Cucumber 25 1.3
Tomato 25 1.0
Broccoli 25 0.9
Squash, scallop 30 1.6
Vetch, common 30 1.1
Wildrye, beardless 30 0.6
Sudangrass 30 0.4
Wheatgrass, standard crested 35 0.4
Beet, red (b) 40 0.9
Fescue, tall 40 0.5
Squash, zucchini 45 0.9
Hardinggrass 45 0.8
Cowpea 50 1.2
Trefoil, narrow-leaf birdsfoot 50 1.0
Ryegrass, perennial 55 0.8
Wheat, Durum 55 0.5
Barley (forage) (b) 60 0.7
Wheat (b) 60 0.7
Sorghum 70 1.6
Bermudagrass 70 0.6
Sugarbeet (b) 70 0.6
Wheatgrass, fairway crested 75 0.7
Cotton 75 0.5
Wheatgrass, tall 75 0.4
Barley (b) 80 0.5

Notes:

(a) These data serve only as a guidline to relative tolerance among crops. Absolute tolerances vary depending upon climate, soil conditions, and cultural practices.
(b) Chloride concentrations in saturated-soil extracts sample in rootzone. To convert CL- concentrations to ppm, multiply threshold values by 35. To convert % yield decrease to % per ppm, divide slope values by 35.
(c) Less tolerant during emergence and seedling stage.
(d) Values for paddy rice refer to the Cl- concentration in the soil water during flooded growing conditions.