CROP NUTRITION
Prunes.
Plan by growth stage.
Explore a seasonal NABTA product example for mature prunes, 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.
PrunesView growth stages, NABTA rates & application timing
Illustrative feeding program · agronomic review required
Example block: 3.0 tons DRIED fruit/ac. Mature commercial planting with zero assumed soil, water or other nutrient credits.
Seasonal fertilizer nitrogenPotassium rate pending
Seasonal potassium budget118.2 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 / bloomBefore crop set | No routine application0 lb/ac in this example | Rate pendingSet the potassium budget from crop and test results. |
| Fruit setApr | 207.4 lb/acStage total: 7 separate applications × 29.6 lb/ac each | Rate pendingSet the potassium budget from crop and test results. |
| Fruit growthMay | 207.4 lb/acStage total: 7 separate applications × 29.6 lb/ac each | Rate pendingSet the potassium budget from crop and test results. |
| Fruit growthJun | 207.4 lb/acStage total: 7 separate applications × 29.6 lb/ac each | Rate pendingSet the potassium budget from crop and test results. |
| Final developmentJul | No routine application0 lb/ac in this example | Rate pendingSet the potassium budget from crop and test results. |
| Harvest / postharvestAug–Sep; reassess | No routine application0 lb/ac in this example | Rate pendingSet the potassium budget from crop and test results. |
| Leaf fallNo routine N | No routine application0 lb/ac in this example | Rate pendingSet the potassium budget from crop and test results. |
Assumptions & adjustments
- Example demand = 3 dry tons × 12.5 lb N/ton + 30 lb/ac growth. UCCE describes the growth allowance as uncertain.
- 70% recovery and equal April–June N portions are explicit draft assumptions. UCCE favors April–June N.
- If K is required and no fall K was applied, UCCE suggests equal April–July injections. Annual K amount still needs approval.
- This quantified nitrogen schedule is incomplete as a whole nutrient program. Potassium quantities remain pending; no rate has been borrowed from another crop.
- 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 Prunes 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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