Boron Tolerance Limits for Agricultural Crops
Mass (1990)
- Very Sensitive -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Lemon (b)
Citrus limon
<0.5
--
Blackberry (b)
Rubus sp.
<0.5
--
- Sensitive -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Avocado (b)
Persea americana
0.5-0.75
--
Grapefruit (b)
C. x paradisi
0.5-0.75
--
Orange (b)
C. sinensis
0.5-0.75
--
Apricot (b)
Prunus armeniaca
0.5-0.75
--
Peach (b)
P. persica
0.5-0.75
--
Cherry (b)
P. avium
0.5-0.75
--
Plum (b)
P. domestica
0.5-0.75
--
Persimmon (b)
Diospyros kaki
0.5-0.75
--
Fig, kadota (b)
Ficus carica
0.5-0.75
--
Grape (b)
Vitis vinifera
0.5-0.75
--
Walnut (b)
Juglans regia
0.5-0.75
--
Pecan (b)
Carya illinoinenis
0.5-0.75
--
Onion
Allium cepa
0.5-0.75
--
Garlic
A. sativum
0.75-1.0
--
Sweet potato
Ipomea batatas
0.75-1.0
--
Wheat
Triticum aestivum
0.75-1.0
3.3
Sunflower
Helianthus annuus
0.75-1.0
--
Bean, mung (b)
Vigna radiata
0.75-1.0
--
Sesame (b)
Sesamum indicum
0.75-1.0
--
Lupine (b)
Lupinus hartwegii
0.75-1.0
--
Strawberry (b)
Fragaria sp.
0.75-1.0
--
Artichoke, Jerusalem (b)
Helianthus tuberosus
0.75-1.0
--
Bean, kidney (b)
Phaseolus vulgaris
0.75-1.0
--
Bean, snap
P. vulgaris
1.0
12
Bean, lima (b)
P. lunatus
0.75-1.0
--
Peanut
Arachis hypogaea
0.75-1.0
--
- Moderately Sensitive -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Broccoli
Brassica oleracea botrytis
1.0
1.8
Pepper, red
Capsicum annuum
1.0-2.0
--
Pea (b)
Pisum sativa
1.0-2.0
--
Carrot
Daucus carota
1.0-2.0
--
Radish
Raphanus sativus
1.0
1.4
Potato
Solanum tuberosum
1.0-2.0
--
Cucumber
Cucumis stivus
1.0-2.0
--
Lettuce (b)
Lactuca sativa
1.3
1.7
- Moderately Tolerant -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Cabbage (b)
Brassica oleracea capitata
2.0-4.0
--
Turnip
B. rapa
2.0-4.0
--
Bluegrass, Kentucky (b)
Poa pratensis
2.0-4.0
--
Barley
Hordeum vulgare
3.4
4.4
Cowpea
Vigna unguiculata
2.5
12
Oats
Avena sativa
2.0-4.0
--
Corn
Zea mays
2.0-4.0
--
Artichoke (b)
Cynara scolymus
2.0-4.0
--
Tobacco (b)
Nicotiana tabacum
2.0-4.0
--
Mustard (b)
Brassica juncea
2.0-4.0
--
Clover, sweet (b)
Melilotus indica
2.0-4.0
--
Squash
Cucurbita pepo
2.0-4.0
--
Muskmelon (b)
Cucumis melo
2.0-4.0
--
Cauliflower
B. oleracea botrytis
4.0
1.9
- Tolerant -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Alfalfa (b)
Medicago sativa
4.0-6.0
--
Vetch, purple (b)
Vicia benghalensis
4.0-6.0
--
Parsley (b)
Petroselinum crispum
4.0-6.0
--
Beet, red
Beta vulgaris
4.0-6.0
--
Sugar beet
B. vulgaris
4.9
4.1
Tomato
Lycopersicum
5.7
3.4
- Very Tolerant -
Common Name
Botanical Name
Threshold (a); mg/L
Slope; %per mg/L
Sorghum
Sorghum bicolor
7.4
4.7
Cotton
Gossypium hirsutum
6.0-10.0
--
Celery (b)
Apium graveolens
9.8
3.2
Asparagus (b)
Asparagus officinalis
10.0-15.0
--
Notes:
(a) Maximum permissible concentration in soil water without yield reduction. Boron tolerances may vary, depending upon climate, soil conditions, and crop varieties.
