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Orchard Nutrition:  Nutrient Sprays

 

DORMANT - Apply in Spring Before Buds Open

Nutrient Treatment Rate Per 100 Gal (Dilute) Rate Per Acre Remarks
Zinc maintenance zinc sulfate 36% crystals 1.5-3 lb 6-12 lb                                                                               
zinc sulfate 0.5 lb/gal LC 0.5 gal 2 gal
Tech-Flo Zeta Zinc 22 1-4 pt 1 qt
Zinc deficiency zinc sulfate 36% crystals 10 lb 40 lb  
zinc sulfate 1.2 lb/gal LC 3 gal 12 gal
Tech-Flo Zeta Zinc 1 qt 4 qt

 

PRE-PINK OR PINK - Apply Before Bloom

Nutrient Treatment Rate Per 100 Gal (Dilute) Rate Per Acre Remarks
Boron maintenance Solubor DF 10 oz 3-4 lb Solubor:  see label for further details on rates and maximum levels
Borosol 10 8-32 fl oz 1-4 qt
Boron deficiency Solubor DF 1.25 lb 5 lb Solubor WP:  see label for further details on rates and maximum levels and precations
Borosol 10 8-32 fl oz 1-4 qt

 

FOLIAR SPRAY - Apply After Bloom and Before Harvest

Nutrient Treatment Rate Per 100 Gal (Dilute) Rate Per Acre Remarks
Boron maintenance Solubor DF 10 oz 2.5 lb Solubor WP:  multiple applications at low rates are most effective; see label.
Borosol 10 8 fl oz 1 qt
Boron deficiency Solubor DF 1.25 lb 5 lb Solubor WP:  best applied after harvest or before bloom on pears. Multiple applications at low rates are most effective; see label.
Borosol 10 8-16 fl oz 1-4 qt
Calcium (bitter-pit reduction) calcium chloride 3-4 lb 12-16 lb Make 3 to 5 applications as needed from mid-June to mid-August.
Iron deficiency iron chelate See label See label Follow manufacturer's directions.  All chelates break down rapidly under ultra-violet (sun) light.  Spray chelates in evening or on cloudy days. 
Manganese deficiency manganese sulfate 2 lb 8 lb Apply as soon as leaves are well developed.
Zinc deficiency, non-bearing trees zinc sulfate 36% crystals 1.5 lb 6-12 lb  
zinc sulfate 1.2 lb/gal LC 0.5-1 gal 2-4 gal
Tech-flo Zeta Zinc 0.25-1 pt 1-4 pt
Zinc deficiency, bearing trees Tech-flo Zeta Zinc 0.25-1 pt. 1-4 pt. Caution:  certain varieties of plums, peaches, and apricots are susceptible to zinc excesses.
Magnesium deficiency epsom salts (magnesium sulfate) 10-20 lb 40-80 lb Apply in 3 sprays at 14 day intervals beginning at petal fall.

 

POST HARVEST - Apply in Fall Near Leaf Drop

Nutrient Treatment Rate Per 100 Gal (Dilute) Rate Per Acre Remarks
Nitrogen deficiency (apple only) urea 0.5-2.5 lb 2-10 lb Use only formulations containing 2% or less biuret because of injury risk to tree and fruit.
Boron maintenance Solubor 20.5WP 0.5 lb 2.5 lb See labels
Borosol 10 8 fl. oz 1-4 qt
Boron deficiency Solubor 20.5WP 1 lb 5 lb See labels
Borosol 10 1-2 pt. 1-4 qt
Copper deficiency copper sulfate 53% 1 lb 4 lb  
Kocide 101 (50%) 1 lb 4 lb
Kocide DF (40%) 1.2 lb 4.8 lb
Nitrogen supplement urea 2.5-5 lb 10-20 lb Apples only.  May damage other fruit crops.  Apply before leaf drop.
Zinc maintenance zinc sulfate 36% 1.5-3 lb 6-12 lb Not on apricots.
Tech-flo Zeta Zinc 0.25 qt 1 qt
Zinc deficiency zinc sulfate 36% 2.5-5 lb 10-20 lb Not on apricots.
Tech-flo Zeta Zinc 1 qt 4 qt