Potato seed crop management on processing crop quality & yield - PowerPoint PPT Presentation

Potato seed crop management on processing crop quality & yield January 25, 2018 Brandon, MB

Seed Age Trial • Impact of seed crop management on the subsequent processing potato crop • 4 management factors tested, 2 levels of each: – Planting date – Harvest date – Moisture regime – Storage regime • All combinations of the 4 factors x 2 levels • Each run of the trial takes two years to complete

Seed Age – Year 1 • Apply treatments in year 1, test impact in year 2 Seed from Year 1 Trts Stored at U of M Constant Ramp Up • All combinations of the factors for 16 treatments

Seed Age – Year 2 • Year 2 Test Plots – Randomize and Replicated – Factorial • 4 main factors (plant, harvest, moisture, storage) • All interactions – All test plots treated equally – Emergence, stems, yield and quality

Plot Map Plot #: 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Guard Guard Guard Rep 4 15 7 14 3 10 9 8 13 2 1 11 16 5 12 4 6 Plot #: 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Guard Guard Guard Guard Rep 3 3 10 6 1 4 9 8 7 5 11 13 16 2 12 15 14 Plot #: 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Guard Guard Guard Guard Rep 2 1 11 5 8 14 2 9 15 13 16 3 4 7 12 6 10 Plot #: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Guard Guard Guard Guard Rep 1 1 16 9 15 14 4 13 11 3 6 2 10 8 7 5 12

Storage Treatment

Emergence by Storage Treatment 100 90 80 70 60 50 2016 Constant 40 2016 Ramp-Up 30 2017 Constant 20 2017 Ramp-Up 10 0 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 36

Constant storage Ramp up storage

Constant storage Ramp up storage

LP-EH-IRR-Constant LP-EH-IRR-Ramp Up

How did years compare? 700 600 37 39 58 500 59 >12 oz 210 400 10-12 oz 6-10 oz 228 300 3-6 oz <3 oz 200 254 171 100 68 41 0 2016 2017 2016 2017 Yield 516 541 Specific Gravity 1.098 1.096 > 6 oz of Mkt 67% 53% > 12 oz of Mkt 11% 7% Total Defects 7% 3% Sugar Ends 0% 0% Dark Ends 4% 2%

Seed Age – Years Combined Tuber Gross Yield Total Number Stems/Plant (no dirt) Defects <3 oz 3-6 oz 6-10 oz 10-12 oz >12 oz Main Factors (#000/ac) (cwt/ac) (%) (%) Planting ** ** Early 4.2 7 Late 4.0 9 Harvest Early Late Moisture ** Dryland 4 Irrigated 6 Storage *** *** *** *** *** *** *** Constant 159 3.9 7.8 31.7 40.2 10.3 9.9 Ramp up 182 4.3 10.6 40.7 35.4 6.7 6.6

Seed Age – Size Profile 1.0 6.6 9.9 6.7 10.3 0.8 35.4 >12 oz 0.6 40.2 10-12 oz 6-10 oz 0.4 3-6 oz 40.7 <3 oz 31.7 0.2 10.6 7.8 0.0 Constant Ramp Up

Summary • Early planted seed did have more stems and fewer tubers >12oz • Storage temperatures had the most significant impact on processing crop performance

Summary • Aging of seed by altering storage temperatures in last month has a significant impact – Emergence a few days earlier – No impact on yield, BUT – Changed the size profile to smaller tubers • The constant storage treatment – Emergence catches up by about 30 DAP – 10% more tubers > 6oz

Thank you! Questions?