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Potato Variety Response to Phosphorus Fertilizer

Potato Variety Response to Phosphorus Fertilizer. Mike Thornton, Deron Beck, Jeff Stark and Bryan Hopkins. Petiole P status and yield are related. Y = 237 + 7.24X – 0.026 X 2. R 2 = 0.76. Source: Westermann and Kleinkopf, 1983. Daily uptake rate of P during three years at Aberdeen, ID.

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Potato Variety Response to Phosphorus Fertilizer

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  1. Potato Variety Response to Phosphorus Fertilizer Mike Thornton, Deron Beck, Jeff Stark and Bryan Hopkins

  2. Petiole P status and yield are related Y = 237 + 7.24X – 0.026 X 2 R 2 = 0.76 Source: Westermann and Kleinkopf, 1983

  3. Daily uptake rate of P during three years at Aberdeen, ID Source: Stark, Westermann and Hopkins, 2004

  4. Cultivar use in 2007 Washington Oregon Idaho Shepody

  5. 6LS

  6. Do potato varieties differ in their response to P fertilizer? • Differences in yield response • Differences in P uptake or petiole levels • Differences in P removal by tubers • Varieties with poor root systems or susceptibility to early die might need more P

  7. Methods • Split plot design with 4 rates of P2O5 (0,100, 200, 300 lbs per acre) broadcast as 11-52-0 and incorporated prior to planting. Urea used to balance N rates. • Four cultivars (Burbank, Ranger, Shepody, 6LS) planted as subplots Soil test values (0 to 12”) UI recommendation

  8. Influence of fertilizer rate on marketable yield

  9. Influence of fertilizer rate on tuber size profile Russet Burbank 6 LS

  10. Vine Growth

  11. Vine Growth

  12. Influence of fertilizer rate on plant growth

  13. Influence of fertilizer rate on petiole P concentration Deficient

  14. Influence of fertilizer rate on plant P uptake on Aug 15

  15. Influence of fertilizer rate on P removal in tubers

  16. SUMMARY Plant development was delayed and senescence increased at low P rates, especially in Shepody Petiole P levels were highest in Ranger, lowest in Russet Burbank and 6LS Ranger and 6LS had the strongest yield response to fertilizer P, and removed up to 33 lbs/acre P in tubers at harvest

  17. For information about potatoes, visit: Idaho Center for Potato Research and Education http://www.ag.uidaho.edu/potato

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