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Nutrient Management Strategies for Vegetable Production in Desert Soils

Nutrient Management Strategies for Vegetable Production in Desert Soils. Charles A. Sanchez Professor and Director Yuma Agricultural Center. Efficient N Management for Desert Vegetables. Timed N Availability. Sidedress Application Controlled Release Fertilizers Fertigation.

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Nutrient Management Strategies for Vegetable Production in Desert Soils

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  1. Nutrient Management Strategies for Vegetable Production in Desert Soils Charles A. Sanchez Professor and Director Yuma Agricultural Center

  2. Efficient N Managementfor Desert Vegetables

  3. Timed N Availability • Sidedress Application • Controlled Release Fertilizers • Fertigation

  4. Summary of Responses to N Management

  5. Number of N Applications for Varying Soil Types

  6. Summary • When conditions for N losses were high SD and CRN management strategies were superior. • Under extremely warm conditions some CRN technologies have the potential to cause stand reduction. • Under some production scenarios, the use of CRN strategies were economically favorable.

  7. Plant and Soil Testing

  8. Desirable Levels of Midrib Nitrate-N for Lettuce • Dry Midrib Test 8,000 to 10,000 mg/kg • Sap Test 480 to 542 mg/L

  9. Desirable Levels of Petiole Nitrate-N for Cauliflower

  10. Response of Lettuce to Sidedress N

  11. Design and management • Design and management • physical dimensions [design] • Bed slope [design] • inlet flow rate [design + management] • cutoff time (distance) [design + management]

  12. Zero-Inertia Model

  13. Application efficiency (fine-textured soil)

  14. Performance indices as a function of bed slope, Qo = 0.08 cfs/ft

  15. Current Research • Fertigation • Salinity Assessment for Irrigation Management • Remote Sensing for Irrigation Management

  16. SALT MAPPER gps antenna EM 38-DD gps control box Computer platform Retractable Tube

  17. Thermal detector aerial image collected on Oct. 23, 2001

  18. Soil Texture Variation in Lettuce Field HighlyOrganic Clay ClayLoam SiltLoam Loam SandyLoam LoamySand Sand

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