CROP NUTRITION
Walnuts.
Plan by growth stage.
Explore a seasonal NABTA product example for mature walnuts, 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.
WalnutsView growth stages, NABTA rates & application timing
Illustrative feeding program · agronomic review required
Example block: 2.5 tons in-shell nuts/ac; hulls removed. Mature commercial planting with zero assumed soil, water or other nutrient credits.
Seasonal fertilizer nitrogen150.0 lb K2O/ac
Seasonal potassium budget236.4 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 |
|---|---|---|
| Dormancy / budbreakBefore active shoot growth | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
| Shoot growthApr | 373.3 lb/acStage total: 13 separate applications × 28.7 lb/ac each | 72.1 lb/acStage total: 4 separate applications × 18.0 lb/ac each |
| Fruit growthMay | 373.3 lb/acStage total: 13 separate applications × 28.7 lb/ac each | 72.1 lb/acStage total: 4 separate applications × 18.0 lb/ac each |
| Nut fillJun to early Jul | 497.7 lb/acStage total: 17 separate applications × 29.3 lb/ac each | 144.2 lb/acStage total: 8 separate applications × 18.0 lb/ac each |
| Late nut fill / harvestLate Jul–Oct | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
| Postharvest / leaf fallAutumn | No routine application0 lb/ac in this example | No routine application0 lb/ac in this example |
Assumptions & adjustments
- N example includes 48 lb/ton for crop plus leaf/pruning allowance, then 15 lb/ac woody growth; 70% recovery assumed.
- K = 15 lb/ton nuts + 45 lb/ton hulls removed. Reduce the hull component where hull nutrients actually return.
- 60% spring / 40% early summer N fits UC timing. K is a proposed in-season drip split, not deficiency correction.
- 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 / CDFA crop nutrition reference. Product analyses: CALTRATE label reference · SOP label reference. These references do not imply UC endorsement of NABTA products.
Print / Save PDFDiscuss Your Walnuts ProgramPlan 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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