Geoscience Reference
In-Depth Information
Appendix 14. Nutrient deficiencies in plants: a quick guide
Source: Williams C. H., and Collwell J. D. (1979).
Symptoms appear first in the OLDEST leaves
Nitrogen general yellowing; stunting; premature maturity
Magnesium patchy yellowing; brilliant colours especially around edge
Potassium scorched margins; spots surrounded by pale zones
Molybdenum mottling over whole leaf but little pigmentation; cupping of leaves
and distortion of stems
Cobalt legumes only, as for nitrogen
[Excess salt marginal scorching, generally no spotting]
Symptoms appear first in either the OLDEST or YOUNGEST leaves
Manganese
interveinal yellowing; veins pale green, diffuse; water-soaked
spots; worst in dull weather
Symptoms appear first in the YOUNGEST leaves
Calcium
tiphooking, blackening and death
Sulphur
yellowing; smallness; rolled down; some pigmentation
Iron
interveinal yellowing; veins sharply green, youngest leaves almost
white if severe
Copper
dark blue-green; curling; twisting; death of tips
Zinc
smallness; bunching; yellow-white mottling
Boron
margins chlorotic; crumpling; blackening; distortion
Search WWH ::
Custom Search