Zinc deficiency diagnosis through soil analysis
A. L. Brown, University of California
B. A. Krantz, University of California
California Agriculture 15(11):15-15. DOI: 10.3733/ca.v015n11p15.
Both greenhouse and field results indicate that the ammonium acetate-dithizone test may be useful in identifying soil areas likely to be zinc deficient. Tentatively, 0.5 ppm (parts per million) is believed to be a critical level below which a zinc response might be expected on sensitive field and vegetable crops.
A. L. Brown is Specialist in Soils and Plant Nutrition, University of California, Davis; B. A. Krantz is Extension Soils Specialist, University of California, Davis.