fertigation of fluid nitrogen and phosphate fertilizers for pears in pacific northwest
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/1.jpg)
Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in
Pacific Northwest
Xinhua Yin
Mid-Columbia Agricultural Research and Extension Center
Oregon State University
![Page 2: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/2.jpg)
Current N and P Management System
80-100 lbs N/acre100-125 lbs P2O5/acre
Not close to roots
High application rate
Over- or under-application
Low application flexibility
![Page 3: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/3.jpg)
Split N and P Fertigation
1. Closer to root system.
2. Lower dose - split application.
3. Avoid over- and under-application.
4. Higher application flexibility.
5. Increase growth and yield in the early years.
6. Save time - automatic delivery system.
![Page 4: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/4.jpg)
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.
![Page 5: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/5.jpg)
Treatments
1. Surface broadcast of N & P.
2. Band application of N & P.
3. Broadcast application of N & P to the soil surface plus soil disturbance by band application (no fertilizer).
4. Split fertigation of N & P (80% of N & P).
5. Split fertigation of N & P under micro sprinkler irrigation (80% of N & P).
![Page 6: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/6.jpg)
Fertigation & Irrigation System
![Page 7: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/7.jpg)
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.
Sampling and Measurement
![Page 8: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/8.jpg)
Soil Nutrients after Pear Harvest
Trt Total N Amino sugar N
NH4-N NO3-N Total-P Available P
(%) (ppm) (ppm) (ppm) (ppm) (ppm)
1 0.208c 259.0 1.48 36.6 1310.5 30.3
2 0.261ab 344.4 1.98 59.2 1387.0 43.5
3 0.271a 233.1 1.53 67.6 1256.8 37.0
4 0.234bc 298.2 1.85 8.4 1195.3 36.0
5 0.295a 302.4 1.80 14.4 1255.8 36.8
Sig. * ns ns * ns ns
![Page 9: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/9.jpg)
Leaf Nutrition after Pear Harvest
Trt N P K Ca Mg S B Zn Mn Cu
(%) (%) (%) (%) (%) (%) (ppm) (ppm) (ppm) (ppm)
1 1.90bc 0.101b 1.17 2.35 0.28 0.23c 88.9 169.4 67.3 6.3
2 1.99ab 0.106b 1.43 2.19 0.26 0.25ab 98.1 188.7 70.9 7.6
3 1.80c 0.104b 1.18 2.52 0.30 0.24bc 87.2 170.6 74.9 8.0
4 2.07a 0.118a 1.45 2.24 0.28 0.25a 104.5 180.6 66.5 7.7
5 1.99ab 0.127a 1.39 2.33 0.26 0.25ab 98.2 182.0 69.6 8.1
Sig. * * ns ns ns * ns ns ns ns
![Page 10: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/10.jpg)
Fruit Yield
0
50
100
150
200
250
300
Surface broadcast Band application
Surface + disturbance Fertigation
Fertigation/Micro
Yie
ld (
lbs/
tree
)
Treatment
a a a a a
![Page 11: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/11.jpg)
Fruit Quality
Trt Sugar Firmness Titratable acid
(obrix) (lbs) (meg/100 ml)
1 13.2a 14.2b 4.6b
2 13.4a 14.2b 5.1a
3 12.8ab 14.3b 4.4b
4 13.0ab 15.3a 4.7ab
5 12.3b 14.8ab 4.5b
Sig. * * *
![Page 12: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/12.jpg)
Fruit Scald
Trt Excellent Very slightly Slightly Moderately Severely
% % % % %
1 25.0 40.0 15.0 15.0 5.0
2 40.0 42.5 17.5 2.5 0.0
3 25.0 27.5 22.5 15.0 10.0
4 37.5 42.5 10.0 10.0 0.0
5 35.0 42.5 12.5 7.5 2.5
Sig. * * * * *
![Page 13: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/13.jpg)
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%.
![Page 14: Fertigation of Fluid Nitrogen and Phosphate Fertilizers for Pears in Pacific Northwest](https://reader035.vdocuments.net/reader035/viewer/2022062517/56813a2e550346895da2176e/html5/thumbnails/14.jpg)
Acknowledgments
Fluid Fertilizer Foundation Hood River Grower and Shipper AssociationPotash and Phosphate Institute