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

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Presentation transcript:

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

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

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

Cultivar use in 2007 Idaho Oregon Washington Shepody

6LS

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

YearpHLimeSoil P (ppm) Broadcast (P 2 O 5 /ac) Starter (P 2 O 5 /ac) %15130 lbs40 to 80 lbs %8210 lbs40 to 80 lbs %5290 lbs40 to 80 lbs Soil test values (0 to 12”) UI recommendation Methods -Split plot design with 4 rates of P 2 O 5 (0,100, 200, 300 lbs per acre) broadcast as 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

Russet Burbank6 LS Influence of fertilizer rate on tuber size profile

Vine Growth

Influence of fertilizer rate on plant growth

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

SUMMARY Plant development was delayed and senescence increased at low P rates, especially in Shepody 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 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 Ranger and 6LS had the strongest yield response to fertilizer P, and removed up to 33 lbs/acre P in tubers at harvest

For information about potatoes, visit: Idaho Center for Potato Research and Education