Soybean Seeding Trend Analysis February 2020 The Story ry of f - - PowerPoint PPT Presentation

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Soybean Seeding Trend Analysis February 2020 The Story ry of f - - PowerPoint PPT Presentation

Dec 15, 2022 427 likes •715 views

Atlantic Grains Council Soybean Seeding Trend Analysis February 2020 The Story ry of f Soybean Seeding Rates Introduction Chapter 1: Plant population Chapter 2: Yield Chapter 3: Previous crop Chapter 4: Seeding equipment

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Atlantic Grains Council Soybean Seeding Trend Analysis

February 2020

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The Story ry of f Soybean Seeding Rates

  • Introduction
  • Chapter 1: Plant population
  • Chapter 2: Yield
  • Chapter 3: Previous crop
  • Chapter 4: Seeding equipment
  • Chapter 5: PEI
  • The Moral of the Story – what we’re all dying to know
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In Introduction to Soybean Seeding Tri rial Trend Analysis

  • Over 40 sites across the Maritimes from 2015-2019.
  • Data was “cleaned” for the purpose of trend analysis = 170 results
  • Removed fields where data was incomplete, and the plant

population or yields were outliers (26 results).

  • Treated germination as a variable, along with variety, fertilizers applied

and soil fertility. No statistics stated, just trends.

  • Treatments: 90,000, 110,000, 130,000, 160,000, 190,000 seeds/acre
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Chapter 1: : Pla lant Population

  • Difference between seeding rate and plant population:
  • Seeding rate = seed a desired population by calibrating equipment
  • Plant Population = the actual number of plants per acre in the field

Seeding Rate = Target Plant Population = Actual

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PEI I Pla lant Population

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Chapter 1: : Pla lant Population Target

Results of each treatment were divided into three groups:

  • 1. (+/-20% of target) 80%-120% of target population
  • 2. <80% of target population
  • 3. >120% of target population
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Chapter 1: : Pla lant Population Economics

  • How much does missing the target cost?

Above target 38% of the time!

Target Population Target Seed Cost/acre Cost/acre Over Target 90,000 $51 $10 - $27 110,000 $63 $13 - $33 130,000 $74 $15 - $68 160,000 $91 $18 - $96 190,000 $109 $22 - $115

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PEI I Target Population

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Chapter 2: : Yie ield

How can we compare yields of the seeding rates when the actual plant populations have such a wide range?

  • Compare the yields from fields within target populations only.
  • <80% of target population
  • 80%-120% of target population (+/-20% of target)
  • >120% of target population
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Plant Population yields sometimes change the story and sometimes they confirm it.

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Chapter 2: : Yie ield Economics

Assumptions using 2015-19 average yield results (+/-20% target pop):

  • 1 bag of seed (140,000 seeds) = $80
  • Value of soybeans = $400/tonne

90,000 110000 130000 160000 190000 Avg 1.01 1.01 0.97 1.08 0.96 Min 0.42 0.45 0.59 0.53 0.68 Max 1.53 1.46 1.53 1.80 1.24 51.43 62.86 74.29 91.43 108.57 Avg $351 $343 $315 $341 $277 Min $116 $115 $163 $121 $165 Max $561 $519 $538 $630 $388 Yields MT/acre Target Cost seed/acre Net $/acre

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Chapter 5: : PEI I Yie ield

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Chapter 3: : Previous Crop

Did the previous crop influence plant population or yield?

  • Considered the previous crop only – not the type of

rotation

  • Considered previous crop for effect of crop residue,

seed bed and fertility

  • Previous crops included wheat, barley & oats,

soybeans, corn (grain & silage), potatoes and forage

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Chapter 4: : Seeding Equipment

Did the seeding equipment influence plant population?

  • Soybeans were planted with either a drill or planter
  • Equipment was calibrated prior to planting the trial for

each seeding rate

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Moral of f the Story ry

1) Plant Population

Seeding rates and plant population do not trend together with yields.

  • Highest Yield = 2.16 MT/acre (Pictou Co. NS, 2016, drill)
  • Plant Population = 148,722 plants/acre
  • Highest Plant Population = 391,674 seeds/acre (Prince Co. PEI, 2015, drill)
  • Yield = 1.38 MT/ac

Net* of $778/acre Net* of $326/acre Need to improve accuracy Stop over-seeding Better calibration

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Moral of f the Story ry

2) Yield

  • Plant population and yield do not trend together.
  • There is no difference in yield between 90, 110, 130 & 190,000

seed/acre.

  • 160,000 seeds/acre is showing a greater potential for yield when

seeded at target population.

Plant 130,000 - 160,000 seeds/acre

  • Minimize risk
  • Maximize potential
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Moral of f the Story ry

3) Previous Crop Impacts plant population

  • Lowest % within target = corn
  • Highest % within target = soybeans

Impacts yields

  • Lowest yields = grain
  • Highest yields = forage

Best Yields Plant After:

  • Forage
  • Potatoes
  • Corn
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Moral of f the Story ry

4) Seeding Equipment

  • Planter was more accurate with 61% within target population.

Use a planter Calibrate

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Thoughts and Questions?

Higher plant population doesn’t equal higher yield – why not?

  • Weed pressure
  • No till vs tillage
  • Effect of pH and fertility on below target

population?

  • Variety