CROP NUTRITION
Table grapes.
Plan by growth stage.
Explore a seasonal NABTA product example for mature table grapes, with growth-stage timing, stage quantities and separate application amounts.
Planning example for agronomic review. These calculations use stated assumptions and are not field-validated NABTA recommendations. Adjust for block tests, crop load, water nutrients, salinity and irrigation capacity before field use. Use current product labels.
Mature-acre rates do not apply to young plantings. Missing information is identified in each program. No yield guarantee or UC endorsement is implied.
Table grapesView growth stages, NABTA rates & application timing
Illustrative feeding program · agronomic review required
Example block: N rate is fixed case, not yield model. Mature commercial planting with zero assumed soil, water or other nutrient credits.
Seasonal fertilizer nitrogen60.2 lb K2O/ac
Seasonal potassium budget61.3 lb Ca/ac
Calcium supplied by CALTRATE
How to read this schedule: bold amounts are total product pounds per acre for the entire stage. Divide them across the separate applications shown. Dates are approximate; use actual crop stage. All rates shown are for root-zone fertigation, not foliar spraying.
| Growth stage / timing | NABTA CALTRATE 15.5-0-0 + Ca19 | NABTA SOP 0-0-52 |
|---|---|---|
| DormancyNov–Feb | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
| After budbreakMar–Apr; after frost risk | 64.5 lb/acStage total: 3 separate applications × 21.5 lb/ac each | 17.4 lb/acStage total: 1 separate application × 17.4 lb/ac each |
| Bloom to fruit setApr–May | 96.8 lb/acStage total: 4 separate applications × 24.2 lb/ac each | 40.6 lb/acStage total: 3 separate applications × 13.5 lb/ac each |
| Berry growthMay–Jun; before veraison | 161.3 lb/acStage total: 6 separate applications × 26.9 lb/ac each | 57.9 lb/acStage total: 3 separate applications × 19.3 lb/ac each |
| Veraison to harvestJul–Oct; cultivar dependent | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
| PostharvestWhile canopy stays active | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
| Leaf fallEnd of season | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
Assumptions & adjustments
- Autumn King cost-study example: 50 lb N/ac and 50 lb elemental K/ac = 60.25 lb K2O/ac.
- This is a UC Davis 2018 production-cost assumption, not an optimum-rate experiment or every-cultivar recommendation.
- Timing is a proposed split using UC grape uptake guidance. Recheck vigor, petioles, yield and actual harvest date.
- No routine phosphorus or micronutrient dose is included. These examples assume adequate phosphorus; other nutrients require diagnostic evidence.
- Application counts are arithmetic subdivisions using 30 lb CALTRATE/ac and 20 lb SOP/ac as maximum example event sizes. Confirm current label directions, irrigation frequency, injection capacity, EC and calcium loading. Do not add irrigation solely to fit the schedule.
Product compatibility: apply CALTRATE separately from SOP, MKP, LIB and other phosphate or sulfate solutions, with appropriate flushing. Confirm the current California registration and label for SOP before purchase or use; its current status has not been verified for this example.
Research basis: UC Davis Autumn King production-cost study (2018). UC grape timing guidance. Product analyses: CALTRATE label reference · SOP label reference. These references do not imply UC endorsement of NABTA products.
Historical NABTA LIB 12-6-24 grape reference
This older manufacturer schedule is provided for comparison. Its “325 trees/acre” wording and application method need clarification, and a current label must be confirmed. It is not an additional feed to layer on top of the program above.
| Label stage | LIB 12-6-24, lb/ac |
|---|---|
| Budbreak | 20 |
| Bloom | 20 |
| Post-bloom | 30 |
| Fruit set | 30 |
| Fruit development | 35 |
| Postharvest | 25 |
The 160 lb/ac seasonal total supplies 19.2 lb N, 9.6 lb P2O5, 38.4 lb K2O, 0.96 lb Mg and 13.6 lb S. Credit every nutrient before substituting it into a block program.
Plan for your own block.
Include crop and variety, acreage, planting age, expected yield, irrigation method and recent test results. Ask about current product supply or a specialty blend.
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