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Walnuts (Beta)
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Crops in this Family: Pecan, Walnut, Hickory, Butternut

Below is a tissue nutrient sufficiency table for the Walnut Family (Juglandaceae), primarily based on walnut (Juglans regia), as it is the most agriculturally significant member of the family. This table provides macro- and micronutrient sufficiency ranges, leaf water content (LWC), and Brix values across key growth stages. The values are derived from available research on walnut nutrition, including studies from the University of California, Purdue University, and other horticultural sources, adjusted for Juglandaceae physiology.

Growth stages are defined as:

  • Vegetative (bud break to pre-bloom)
  • Flowering (bloom initiation)
  • Fruit Set (nut formation to shell hardening
  • Fruit Maturation (kernel fill to harvest)
  • Harvest

Nutrient concentrations are in percentages (%) for macronutrients and parts per million (ppm) for micronutrients, with LWC as a percentage of fresh weight and Brix (°Bx) as soluble solids in leaf sap.

Growth Stage

N (%)

P (%)

K (%)

Mg (%)

Ca (%)

S (%)

 

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Vegetative

2.20

3.00

0.10

0.20

1.00

2.00

0.20

0.40

1.00

2.00

0.10

0.20

Flowering

2.00

2.80

0.10

0.20

1.00

2.00

0.20

0.40

1.20

2.20

0.10

0.20

Fruit Set

1.80

2.60

0.08

0.18

1.20

2.20

0.20

0.40

1.20

2.20

0.10

0.20

Fruit Maturation

1.60

2.40

0.08

0.18

1.20

2.20

0.20

0.40

1.00

2.00

0.10

0.20

Harvest

1.50

2.00

0.08

0.18

1.00

2.00

0.20

0.40

1.00

2.00

0.10

0.20

                         
 

B (ppm)

Zn (ppm)

Mn (ppm)

Fe (ppm)

Cu (ppm)

Mo (ppm)

 

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Vegetative

20

50

20

50

20

150

50

150

5

15

0.10

1.00

Flowering

25

60

20

50

20

150

50

150

5

15

0.10

1.00

Fruit Set

25

70

20

50

20

150

50

150

5

15

0.10

1.00

Fruit Maturation

20

50

20

50

20

150

50

150

5

15

0.10

1.00

Harvest

20

40

15

40

15

125

40

120

4

10

0.10

1.00

                         
 

LWC

BRIX

               
 

Min

Max

Min

Max

               

Vegetative

80

85

8

12

               

Flowering

78

83

10

14

               

Fruit Set

77

82

12

16

               

Fruit Maturation

75

80

8

12

               

Harvest

70

75

8

10

               

 

Scanning Recommendation:

  • Ensure that over 25% of the scan bed is covered with a single layer of vegetation.
  • Leaf selection should be similar to this illustration.

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