|
UC IPM Home > Homes,
Gardens, Landscapes, and Turf > Fruits
and Nuts > Cultural Tips
How to Manage Pests
Pests in Gardens and Landscapes
Grape Fertilization Guide
Adequate
nutrition is important for high-quality grapes. Avoid
excessive fertilization and rich soil, however, because
they will contribute to excessive vine vigor and may
reduce fruit set or fruit quality or both. This
table serves as a guide only; fertilizer may rarely be
needed in some aeras with rich soil.
| Element needed |
Fertilizer |
Amount per vine |
When to apply |
Comments |
Nitrogen |
Ammonium sulfate
|
1 lb |
Berry set stage or following bloom
|
Berry set occurs when berries reach 0.25
inch diameter
|
Ammonium nitrate |
0.75 lb |
Urea |
0.5 lb |
Mixed fertilizers |
Follow label |
Animal manures: poultry, rabbit, steer, cow |
5 to 10 lb
15 to 20 lb
|
January or February |
Poultry manure may cause zinc deficiency
in light, sandy soils |
Zinc |
Basic or neutral
Zinc sulfate
(52% zinc)
|
0.1 lb/gal |
1 week prior to bloom or at full
bloom on foliage |
Don't apply after bloom |
Potassium to compensiate for deficiency |
Potassium sulfate
(44% K) |
Severe: 5 to 6 lb/vine
Moderate: 4 lb/vine
Mild: 3 lb/vine |
When deficient, apply to soil 6 inches deep, 18 inches
from trunk
Concentrate at vine |
irrigate after application |
|
