Planting Recommendations

The rules of growing corn don’t change; fertilize according to soil test and deal with weeds the way you normally deal with weeds with hybrid corn. If you spray any of our corn with RoundUp it will die. All our seed is open pollinated. None of them are a GMO.

We want to give you the information you need to achieve the best results possible with our corn. If you are successful, we are too. Plant population is an important element to a successful crop. The following is our recommendation for your planter setting. First, establish your Target Harvest Population. We recommend for these O.P. varieties a harvest plant population of 18,000 – 24,000, depending on soil fertility and environmental stress. The lower your soil fertility and the more stress your crop will endure the lower your Target Harvest Population. We have some veteran growers pushing into the high twenties and thirty thousand numbers, but we are more comfortable with the more conservative approach. We don’t see the nutrition or yield advantages at those high populations. The less stress on a crop the better yield and nutrition.

Your Target Harvest Population divided by the % Germ (printed on the bag) equals Live Kernels (Always change the % to a decimal. Example: 82% = 0.82) At Green Haven we don’t use any fungicides or chemicals to treat our seed in order to improve germ test results. Therefore % germ can vary especially in a cold wet year. By not using the crutch of the chemicals fungicides, we have stronger genetics. By natural selection, only the hardier seed is allowed to propagate. To determine planter setting, take Live Kernels and divide by a % stress factor. To determine stress factor, consider soil temperature, seed bed preparation, moisture, heat, weed pressure, method of weed control, seed depth, or any other factor that would keep a live kernel from making it to harvest. If you anticipate 10% of the Live Kernels will never make it to harvest, you would use a 90% stress factor and therefore divide by 0.90.

To Figure Planting Setting

STEP 1: Harvest Population / % Germ (printed on bag) = Live Kernels
STEP 2: Live Kernels / % Stress = Planter Setting

Calibration of Planter for Seed Drop

  • Jack up planter.
  • Tie a 50-foot string around drive tire.
  • Turn drive wheel smoothly at planting speed an equivalent distance of 50 feet.
  • Determine kernel drop using chart below.
  • EXAMPLE: To drop 32,200 seeds/A at 30” rows, approximately 92 kernels would drop in 50 feet

Number of Kernels to Be Dropped in 50’ of Test Row To Arrive at Planter Setting

Planter Setting Population

Row Width 18,400 20,700 23,000 25,300 27,600 29,900 32,200 34,500 36,800
30" 50 60 66 72 89 86 92 99 106
32" 57 64 70 77 85 92 99 106 113
34" 60 68 75 83 90 98 105 113 120
36" 64 72 79 87 95 104 110 118 127
38" 67 74 84 92 101 109 117 125 133
40" 70 80 89 97 106 115 123 132 140

Quick Check Calibration Method (Less Accurate)

Count how many seeds drops in 10 feet when operating planter at planting speed on a hard surface where seeds won’t cover.

  • Multiply by 5.
  • Determine estimate kernel drop using chart above.
  • EXAMPLE: If a 32” planter dropped 20 seeds in 10 feet, multiply 20 by 5.
  • 20 x 5 = 100

Using the above chart, it can be determined that the planter is dropping approximately 32,200+ kernels.


Planter Setting

Calculation Examples

EXAMPLE 1

STEP 1:

  • Target Harvest Population / % Germ = Live Kernels
  • 20,000 / 0.82 = 24,390 Live Kernels

  • STEP 2:

  • Live Kernels / % Stress = Planter Setting
  • 24,390 / 0.90 = 27,100 Planter Setting

  • EXAMPLE 2

    STEP 1:

  • Target Harvest Population / % Germ = Live Kernels
  • 20,000 / 0.79 = 25,316 Live Kernels

  • STEP 2:

  • Live Kernels / % Stress = Planter Setting
  • 25,316 / 0.85 = 27,783 Planter Setting

  • To Determine your Planter Setting

    STEP 1: Target Harvest Population / % Germ = Live Kernels

    STEP 2: Live Kernels / % Stress = Planter Setting

    REMEMBER: Always change the % to decimal Example: 82% = 0.82

    Planting Tips

    Prepare a good seed bed and set seed firmers on planter to provide good soil to seed contact. Good seed bed preparation and proper planter operation will better uniform emergence. More uniform emergence will later provide better pollination that will result in higher yields.

    When considering planting date. In short season areas plant early enough to take advantage of all the solar power you can while considering soil temperature.

    Generally, the higher the soil temperature (with proper soil moisture) the quicker corn germinates and comes up. Ideally, corn should be planted at soil temperatures close to 60 degrees Fahrenheit.

    Planting depth should be varied according to expected weather and present soil conditions:

  • If cool and wet, plant shallow 1 – 1 ½”
  • If hot and dry, plant 2 – 3”
  • Rule of Thumb – plant into moisture

  • Deal with weeds early when they are small. Get them before they do any more damage. It is curious how life lessons appear when we watch His creation at work.

     
    ©2014 Green Haven Open Pollinated Seed Group