Zinc is found in sufficient quantities for plant growth in most soils, but in the Gulf States and California, a deficiency is common. It is most common in calcareous or sandy soils.
Zinc’s function is as an essential element. Zinc is a catalyst, along with copper and manganese, and it is essential for chlorophyll production. Its presence also stimulates growth. Together with copper, zinc aids in the development of enzymes involved in nitrogen reduction.
Pecans, conifers (especially pines) and many other plants respond to zinc supplements.
Broadleaf plants symptoms are leaves that are uniformly yellow (chlorotic), sometimes with necrotic spots; small (little-leaf), narrow, and pointed. Shoots of small diameter form with rosettes of leaves at tips which may die back. Fruit set is light, with small, pointed, highly-colored fruit.
Conifer symptoms are the branches and needles are extremely stunted. Chlorosis occurs. All but first and second year needles drop. Terminals die back.