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 |
The pesticide information on this page may become out of date as products and active ingredients change or become unavailable. Some of the pesticides listed are only available for use by licensed pesticide applicators. No endorsements of named products are intended, nor is criticism implied of products not mentioned.
