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Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest

Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest. Xinhua Yin Mid-Columbia Agricultural Research and Extension Center Oregon State University. Current N and P Management System. 80-100 lbs N/acre 100-125 lbs P 2 O 5 /acre. Not close to roots

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Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest

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  1. Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest Xinhua Yin Mid-Columbia Agricultural Research and Extension Center Oregon State University

  2. Current N and P Management System • 80-100 lbs N/acre • 100-125 lbs P2O5/acre • Not close to roots • High application rate • Over- or under-application • Low application flexibility

  3. Split N and P Fertigation • Closer to root system. • Lower dose - split application. • Avoid over- and under-application. • Higher application flexibility. • Increase growth and yield in the early years. • Save time - automatic delivery system.

  4. Objectives • Compare fruit yields, quality, and storability under split fertigation of N and P or band application of N and P with broadcast application of dry N and P to the soil surface. • Compare the costs on installing and maintaining a N and P fertigation system with those on the surface broadcast of dry N and P system.

  5. Treatments • Surface broadcast of N & P. • Band application of N & P. • Broadcast application of N & P to the soil surface plus soil disturbance by band application (no fertilizer). • Split fertigation of N & P (80% of N & P). • Split fertigation of N & P under micro sprinkler irrigation (80% of N & P).

  6. Fertigation & Irrigation System

  7. Sampling and Measurement • Soil total N, amino sugar N, NH4+, NO3-, total P, available P, pH, and organic matter. • Leaf N, P, K, etc. • Tree vigor. • Fruit yield, size, firmness, color, and sugar. • Fruit storability.

  8. Soil Nutrients after Pear Harvest

  9. Leaf Nutrition after Pear Harvest

  10. Fruit Yield a a a a a Yield (lbs/tree) Treatment

  11. Fruit Quality

  12. Fruit Scald

  13. Summary • Split fertigation of N and P slightly increases pear yield and size compared with surface application of dry N and P Fertilizers. • Split N and P fertigation or banding application significantly reduces fruit scald. • Split fertigation of N and P reduces N and P fertilizer uses by 20%.

  14. Acknowledgments Fluid Fertilizer Foundation Hood River Grower and Shipper Association Potash and Phosphate Institute

  15. Thanks!!! Questions???

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