Useful Tables: Adjustments and Conversions on Corn and Soybean Parameters

AGF-502
Agriculture and Natural Resources
Date: 
12/21/2018
Alexander J. Lindsey, Assistant Professor, Agronomy and Crop, Department of Horticulture and Crop Science
Chris Zoller, Associate Professor and Extension Educator, Agriculture and Natural Resources, Tuscarawas County

Expected Corn Yield Due to Various Planting Dates and Harvest Population Rates*

Planting Date Plants per Acre at Harvest
10,000 15,000 20,000 25,000 30,000 35,000
Apr 10 62 76 86 92 94 93
Apr 20 67 81 91 97 99 97
Apr 30 68 82 92 98 100 98
May 9 65 79 89 95 97 96
May 19 59 73 84 89 91 89
May 29 49 63 73 79 81 79
*Yields are expressed as a % of optimum planting date and population yield.

Seed Spacings to Achieve Various Corn Plant Populations

  Inches between Kernels Final* Pop.
Seeds/acre 15" row 20" row 30" row 40" row
15,000 27.9 20.9 13.9 10.5 13,500
16,000 26.1 19.6 13.1 9.8 14,400
17,000 24.6 18.4 12.3 9.2 15,300
18,000 23.2 17.4 11.6 8.7 16,200
19,000 22.0 16.5 11.0 8.3 17,100
20,000 20.9 15.7 10.5 7.8 18,000
22,000 19.0 14.3 9.5 7.1 19,800
24,000 17.4 13.1 8.7 6.5 21,600
26,000 16.1 12.1 8.1 6.0 23,400
28,000 14.9 11.2 7.5 5.6 25,200
30,000 13.9 10.4 7.0 5.2 27,000
32,000 13.1 9.8 6.6 4.9 28,800
34,000 12.3 9.2 6.1 4.6 30,600
36,000 11.6 8.7 5.8 4.4 32,400
40,000 10.4 7.9 5.2 3.9 36,000
*Assuming 10% stand loss

Corn Moisture Corrections

Pounds Needed to Equal One Bushel of No. 2 Corn
Percent Moisture Shell Corn Ear Corn Percent Moisture Shell Corn Ear Corn
10.0 52.58 63.49 23.5 61.86 79.01
11.0 53.17 64.25 24.0 62.26 79.76
12.0 53.77 65.06 24.5 62.68 80.50
12.5 54.08 65.50 25.0 63.09 81.25
13.0 54.39 65.95 25.5 63.52 82.03
13.5 54.71 66.42 26.0 63.95 82.82
14.0 55.02 66.89 26.5 64.38 83.50
14.5 55.35 67.39 27.0 64.82 84.19
15.0 55.67 67.89 27.5 65.27 84.90
15.5 56.00 68.40 28.0 65.72 85.62
16.0 56.33 68.94 28.5 66.18 86.32
16.5 56.67 69.51 29.0 66.65 87.04
17.0 57.01 70.09 29.5 67.12 87.76
17.5 57.36 70.69 30.0 67.60 88.50
18.0 57.71 71.31 31.0 68.58 89.94
18.5 58.06 71.95 32.0 69.59 91.43
19.0 58.42 72.60 33.0 70.63 92.85
19.5 58.78 73.27 34.0 71.70 94.28
20.0 59.15 73.96 35.0 72.80 95.71
20.5 59.52 74.60 36.0 73.94 97.17
21.0 59.90 75.36 37.0 75.11 98.64
21.5 60.28 76.07 38.0 76.32 100.13
22.0 60.67 76.79 39.0 77.57 101.63
22.5 61.06 77.53 40.0 78.87 103.16
23.0 61.45 78.25      
lbs dry corn = [(100% - wet%) / (100% - Dry %)] x lbs. of wet grain.
Example: Convert 10,000 lbs. of 25% moisture corn to 15.5% moisture: [(100%-25%) / (100%-15.5%) x 10,000 lbs.] = (25% / 84.5% x 10,000)= 0.888 x 10,000 = 8,880 lbs. @ 15.5%

USDA Grade Requirements for Shelled Corn

    Maximum Limits of Damaged Kernels
Grade Min. Test Weight/Bushel Cracked Foreign Material* Total Heat
  (lb) (%)
1 56 2 3 .1
2 54 3 5 .2
3 52 4 7 .5
4 49 5 10 1.0
5 46 7 15 3.0

Sample grade shall include corn of the class Yellow Corn, White Corn, or Mixed Corn, which does not come within the requirements of any of the grades from No. 1 to No. 5, inclusive; or which contains stones and/or cinders; or which is musty, sour, or heating; or which has a commercially object quality.
*Broken corn, foreign material, and other grains.

Soybean Moisture Conversions

% Moisture Pounds per Bu % Moisture Pounds per Bu
7.0 56.13 14.0 60.70
7.5 56.43 14.5 61.05
8.0 56.74 15.0 61.41
8.5 57.05 15.5 61.77
9.0 57.36 16.0 62.14
9.5 57.68 16.5 62.51
10.0 58.00 17.0 62.89
10.5 58.32 17.5 63.27
11.0 58.65 18.0 63.66
11.5 58.98 18.5 64.05
12.0 59.32 19.0 64.44
12.5 59.66 19.5 64.84
13.0 60.00 20.0 65.25
lbs dry = [(100% - wet%) / (100% - dry%)] x lbs of wet grain
Example: Convert 3,000 lbs of 18% moisture beans to 13.0% moisture: [(100%-18%) / (100%-13%)] x 3,000 lbs = 82/87 x 3,000 lbs = 0.942 x 3,000 lbs = 2827.5 lbs @ 13%.

Length of Row Equal to 1/1,000th Acre

Row Width Length of Single Row to Equal 1,1000th of an Acre
Inches Feet Inches
7.5 69 8
10 52 3
15 34 10
20 26 2
28 18 8
30 17 5
40 13 1

Atomic Weight of Nutrients

Element Atomic Weight
N Nitrogen 14.01
P Phosphorus 30.98
K Potassium 39.10
Ca Calcium 40.08
Mg Magnesium 24.31
S Sulfur 32.06
Cu Copper 63.54
Fe Iron 55.85
Mn Manganese 54.94
Zn Zinc 65.37
B Boron 10.82
Cl Chlorine 35.46
Mo Molybdenum 95.94
O Oxygen 16.00
C Carbon 12.01
H Hydrogen 1.01
Water = H2O= 2*1.01+16.0 = 18.02

Micronutrient Sources

ZINC MATERIALS PERCENTAGE:
Zinc Sulfate (hydrated) 22-36
Zinc Sulfate (basic) 55
Zinc Oxide 50–80
Zinc Chelates 6–14
Ammoniated Zinc Complexes 10
Organic Zinc Complexes 5–12
MANGANESE MATERIALS
Manganese Sulfate 26–28
Manganese Chloride 17
Manganese Chelate 12
Manganese Carbonate 31
Manganese Oxide 63
Manganous Oxide 41-68
Manganese Frits 10–25
IRON MATERIALS
Ferrous Sulfate 19–21
Ferrous Ammonium Sulfate 14
Iron Chelates 6-12
BORON MATERIALS
Borax 11
Boron Frits 2-11
Boric Acid 17
Sodium Tetraborate 14-15
Sodium Pentaborate 18
Solubur 20-21
COPPER MATERIALS
Copper Sulfate or Copper Sulfate Monohydrate 25-35
Cupric Oxide 75
Cuprous Oxide 89
Copper Chelate EDTA 13
Copper Acetate 32
Copper Ammonium Phosphate 32
Manure/Biosolids <0.43
MOLYBDENUM MATERIALS  
Ammonium Molybdate 54
Sodium Molybdate 39
Molybdenum Trioxide 66

Original author: Dr. Jim Beuerlein, Retired, Extension Agronomist. (Originally published in 2001.)