Phosphorus Fertilizer Production and Technology - International
Potato Variety Response to Phosphorus Fertilizer
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Transcript of Potato Variety Response to Phosphorus Fertilizer
Potato Variety Response to Potato Variety Response to Phosphorus FertilizerPhosphorus Fertilizer
Mike Thornton, Deron Beck, Jeff Stark and Mike Thornton, Deron Beck, Jeff Stark and Bryan HopkinsBryan Hopkins
Petiole P status and yield are relatedPetiole P status and yield are related
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Days from tuber set till tops < 0.22%P
Total Yield (cwt/ac)
Source: Westermann and Kleinkopf, 1983
Y = 237 + 7.24X – 0.026 X 2
R 2 = 0.76
Daily uptake rate of P during three years Daily uptake rate of P during three years at Aberdeen, IDat Aberdeen, ID
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Days after emergence
P uptake (lbs/ac-day)
Source: Stark, Westermann and Hopkins, 2004
Cultivar use in 2007Cultivar use in 2007
IdahoOregon
Washington
Shepody
6LS
Do potato varieties differ in their Do potato varieties differ in their response to P fertilizer?response to P fertilizer?
Differences in yield responseDifferences in yield response Differences in P uptake or petiole levelsDifferences in P uptake or petiole levels Differences in P removal by tubersDifferences in P removal by tubers
Varieties with poor root systems or Varieties with poor root systems or susceptibility to early die might need more Psusceptibility to early die might need more P
Year pH Lime Soil P (ppm)
Broadcast(P2O5/ac)
Starter(P2O5/ac)
2005 8.2 1% 15 130 lbs 40 to 80 lbs
2006 7.7 2% 8 210 lbs 40 to 80 lbs
2007 8.2 1% 5 290 lbs 40 to 80 lbs
Soil test values (0 to 12”)UI recommendation
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
Influence of fertilizer rate on marketable yield
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>126-124-60-4
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Russet Burbank 6 LS
Influence of fertilizer rate on tuber size profile
Vine GrowthVine Growth6LS
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Vine GrowthVine GrowthRusset Brubank
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Influence of fertilizer rate on plant growth
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Fertilizer Rate (lbs P2O5)
% total P
ShepodyRangerRusset B.6LS
Deficient
Influence of fertilizer rate on petiole P concentration
Influence of fertilizer rate on plant P uptake on Aug 15
Influence of fertilizer rate on P removal in tubers
SUMMARYSUMMARY
Plant development was delayed and Plant development was delayed and senescence increased at low P rates, senescence increased at low P rates, especially in Shepodyespecially in Shepody
Petiole P levels were highest in Ranger, Petiole P levels were highest in Ranger, lowest in Russet Burbank and 6LSlowest in Russet Burbank and 6LS
Ranger and 6LS had the strongest yield Ranger and 6LS had the strongest yield response to fertilizer P, and removed up to response to fertilizer P, and removed up to 33 lbs/acre P in tubers at harvest33 lbs/acre P in tubers at harvest
For information about potatoes, visit:
Idaho Center for Potato Research and Education
http://www.ag.uidaho.edu/potato