Table 29. Soil and Foliar Application of Secondary and Trace Nutrients.

Nutrient Application rate
(lb/A)		 Nutrient source % Composition
(nutrient)

Boron

0.5-3.5 (soil)

Borax
Boric acid
Sodium pentaborate
Sodium tetraborate

11
17
18
21

Calcium

2-5 (foliar)

Calcium Chloride
Calcium nitrate
Liming materials and gypsum supply calcium when used as soil amendments

36
20

Copper

2-6 (soil)

Cupric chloride
Copper sulfate
Copper sulfate
Cupric oxide
Cuprous oxide
Copper chelates

47
35
25
80
89
8-13

Iron

2-4 (soil)
0.5-1 (foliar)

Ferrous sulfate
Ferric sulfate
Ferrous carbonate
Iron chelates

20
20
42
5-12

Magnesium

25-30 (soil)
2-4 (foliar)

Magnesium sulfate
Magnesium oxide
Dolomitic limestone
Magnesium chelates

10
55
11
2-4

Manganese

20-100 (soil)
2-5 (foliar)

Manganese sulfate
Manganous oxide
Manganese chelates

27
41-68
12

Molybdenum

25-400 grams (soil)
25 grams(foliar)

Ammonium molybdate
Sodium molybdate

54
39

Sulfur

20-50 (soil)

Elemental Sulfur
Ammonium sulfate
Potassium sulfate
Calcium sulfate
Ferric sulfate

100
24
18
16-18
18-19

Zinc

2-10 (soil)
0.25 (foliar)

Zinc oxide
Zinc sulfate
Zinc chelate

80
23
14

Vegetables differ in their requirements for these secondary nutrients. Availability in the soil is influenced by soil reaction and soil type. Use lower rates for band application than for broadcast. Foliar application is one way to correct an evident deficiency that appears while the crop is growing.

Source: Knotts Handabook for Vegetable Growers 4th ed. Don Maynard and George Hochmuth


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