INTRODUCTION

A study was conducted at Springfield, TN, Greeneville, TN and Lexington, KY to evaluate the effects of cover type and dibble depth on the production of tobacco transplants in outdoor float beds.  Three beds were seeded on March 27 at each location, with one bed being covered with a standard Continental brand cover, one covered with a Reemay cover, and one covered with 5 mil, 50% white shade plastic.  The study was repeated on April 10.  Results demonstrate that there is no significant difference between covers for germination at 16 days.  Spiral rooting was much higher in shallow dibbled trays than in deep dibbled trays; spiral rooting was minimized in beds covered with white plastic shade, especially in trays that were deep dibbled

SUMMARY

Effects of Cover Type and Dibble Depth on the Production of Tobacco Plants in Outdoor Float Beds
First Seeding   3-27-01
    10 days 14 days 16 days 16 Days 16 Days
    4/6/01
Number
Germinated
4/6/01
Percent
Germination
4/10/01
Number
Germinated
4/10/01
Percent
Germination
4/12/01
Number
Germinated
4/12/01
Percent
Germination
4/10/01
Number
Spiral Roots
4/10/01
Percent
Spiral Roots
4/10/01
Number
H20 Damage
4/10/01
Percent
H20 Damage
   
Cover Dibble Depth

Springfield, Tennessee
 
Continental Deep 0 0 218.4 92.2 224 94.5 5.6 2.4 0 0
Continental Shallow 0 0 222.6 92 224.6 92.8 31 12.9 2.4 1
Continental Mean 0 0 220.5 92.1 224.3 93.7 18.3 7.6 1.2 0.5
                       
Reemay Deep 0 0 205.2 88.2 213.6 91.8 4.2 1.8 0 0
Reemay Shallow 0 0 218.4 90.2 225.4 93.1 40.8 16.9 0 0
Reemay Mean 0 0 211.8 89.2 219.5 92.5 22.5 9.3 0 0
                       
White Plastic Deep 0 0 218.2 90.2 223.6 92.4 2 0.8 0 0
White Plastic Shallow 0 0 219.6 90.7 222.8 92.1 5.2 2.1 0 0
White Plastic Mean 0 0 218.9 90.5 223.2 92.2 3.6 1.5 0 0
                       
Mean Across Covers Deep 0 0 213.9 90.2 220.4 92.9 3.9 1.7 0 0
Mean Across Covers Shallow 0 0 220.2 91 224.3 92.7 25.7 10.6 0.8 0.3

Greeneville, Tennessee 
Continental Deep 0 0 216.4 89.4 219.4 90.7 1.8 0.7 7.4 3.1
Continental Shallow 0 0 221.8 91.7 229 94.6 12 5 5.2 2.1
Continental Mean 0 0 219.1 90.5 224.2 92.6 6.9 2.9 6.3 2.6
                       
Reemay Deep 0 0 212.6 87.9 217 89.7 5.2 2.1 3.8 1.7
Reemay Shallow 0 0 210.6 87 219.2 90.6 11.2 4.6 4 1.7
Reemay Mean 0 0 211.6 87.4 218.1 90.1 8.2 3.4 3.9 1.7
                       
White Plastic Deep 0 0 211.4 87.4 228.6 94.5 0 0 0 0
White Plastic Shallow 0 0 183.2 75.7 222.6 92 2.6 1.1 0 0
White Plastic Mean 0 0 197.3 81.5 225.6 93.2 1.3 0.5 0 0
                       
Mean Across Covers Deep 0 0 213.5 88.2 221.7 91.6 2.3 1 3.7 1.6
Mean Across Covers Shallow 0 0 205.2 84.8 223.6 92.4 8.6 3.6 3.1 1.3

Lexington, Kentucky 
Continental Deep 0 0 198.8 82.1 212.6 87.9 5.2 2.1 0 0
Continental Shallow 0 0 188 77.7 200.4 82.8 8.6 3.6 2.6 1.1
Continental Mean 0 0 193.4 79.9 206.5 85.3 6.9 2.9 1.3 0.5
                       
Reemay Deep 0 0 205.8 85 210.8 87.1 2.6 1.1 0 0
Reemay Shallow 0 0 208 86 216.6 89.5 6.6 2.7 0.4 0.2
Reemay Mean 0 0 206.9 85.5 213.7 88.3 4.6 1.9 0.2 0.1
                       
White Plastic Deep 0 0 195.8 80.9 213 88 4 1.7 0 0
White Plastic Shallow 0 0 164.6 68 197.4 81.8 9.2 3.8 0 0
White Plastic Mean 0 0 180.2 74.5 205.2 84.9 6.6 2.7 0 0
                       
Mean Across Covers Deep 0 0 200.1 82.7 212.1 87.7 3.9 1.6 0 0
Mean Across Covers Shallow 0 0 186.9 77.2 204.8 84.7 8.1 3.4 1 0.4

Mean Across All Locations 
    10 days 14 days 16 days 16 days 16 days
    4/6/01
Number
Germinated
4/6/01
Percent
Germination
4/24/01
Number
Germinated
4/24/01
Percent
Germination
4/26/01
Number
Germinated
4/26/01
Percent
Germination
4/26/01
Number
Spiral Roots
4/26/01
Percent
Spiral Roots
4/26/01
Number
H20 Damage
4/26/01
Percent
H20 Damage
   
Cover Dibble Depth
                       
Continental Deep 0 0 211.2 87.9 218.7 91 4.2 1.8 2.5 1
Continental Shallow 0 0 210.8 87.1 218 90.1 17.2 7.1 3.4 1.4
Continental Mean 0 0 211 87.5 218.3 90.6 10.7 4.4 2.9 1.2
                       
Reemay Deep 0 0 207.9 87 213.8 89.5 4 1.7 1.3 0.6
Reemay Shallow 0 0 212.3 87.7 220.4 91.1 19.5 8.1 1.5 0.6
Reemay Mean 0 0 210.1 87.4 217.1 90.3 11.8 4.9 1.4 0.6
                       
White Plastic Deep 0 0 208.5 86.1 221.7 91.6 2 0.8 0 0
White Plastic Shallow 0 0 189.1 78.2 214.3 88.6 5.7 2.3 0 0
White Plastic Mean 0 0 198.8 82.1 218 90.1 3.8 1.6 0 0
                       
Mean Across Covers Deep 0 0 209.2 87 218.1 90.7 3.4 1.4 1.2 0.5
Mean Across Covers Shallow 0 0 204.1 84.3 217.6 89.9 14.1 5.9 1.6 0.7
* 50% shade 6 mil white plastic

SUMMARY

Effects of Cover Type and Dibble Depth on the Production of Tobacco Plants in Outdoor Float Beds
Second Seeding   4-10-01
    10 days 14 days 16 days 16 Days 16 Days
    4/20/01
Number
Germinated
4/20/01
Percent
Germination
4/24/01
Number
Germinated
4/24/01
Percent
Germination
4/26/01
Number
Germinated
4/2601
Percent
Germination
4/26/01
Number
Spiral Roots
4/26/01
Percent
Spiral Roots
4/26/01
Number
H20 Damage
4/26/01
Percent
H20 Damage
   
Cover Dibble Depth


Springfield, Tennessee

Continental Deep 200 82.6 222.4 91.9 224 92.6 3.6 1.5 5 2.1
Continental Shallow 160.2 66.2 227.2 93.9 226.6 93.6 28.2 11.7 1.6 0.7
Continental Mean 180.1 74.4 224.8 92.9 225.3 93.1 15.9 6.6 3.3 1.4
                       
Reemay Deep 183.6 78.9 199 85.5 201.4 86.5 3.6 1.5 17.2 7.1
Reemay Shallow 152.6 63.1 214.6 88.7 217.4 89.8 31.4 13 4.4 1.8
Reemay Mean 168.1 71 206.8 87.1 209.4 88.2 17.5 7.3 10.8 4.5
                       
White Plastic* Deep 193.6 80.4 228 94.7 229 95.1 2.2 0.9 0 0
White Plastic Shallow 78.6 32.5 224.8 92.9 227.4 94 20.2 8.3 0 0
White Plastic Mean 136.1 56.4 226.4 93.8 228.2 94.5 11.2 4.6 0 0
                       
Mean Across Covers Deep 192.4 80.6 216.5 90.7 218.1 91.4 3.1 1.3 7.4 3.1
Mean Across Covers Shallow 130.5 53.9 222.2 91.8 223.8 92.5 26.6 11 2 0.8


Greeneville, Tennessee 

Continental Deep 149.4 61.7 227.4 94 227.4 94 2.2 0.9 3.4 1.4
Continental Shallow 99.6 41.2 219.2 90.6 219.2 90.6 21 8.7 0.6 0.2
Continental Mean 124.5 51.4 223.3 92.3 223.3 92.3 11.6 4.8 2 0.8
                       
Reemay Deep 125.4 51.8 224.6 92.8 224.6 92.8 0 0 0.8 0.3
Reemay Shallow 98.8 40.8 223.2 92.2 223.2 92.2 20.8 8.6 0 0
Reemay Mean 112.1 46.3 223.9 92.5 223.9 92.5 10.4 4.3 0.4 0.2
                       
White Plastic Deep 71.8 29.7 226.8 93.7 226.8 93.7 0.2 0.1 0 0
White Plastic Shallow 73.6 30.4 226.2 93.5 226.2 93.5 5.6 2.3 1 0.4
White Plastic Mean 72.7 30 226.5 93.6 226.5 93.6 2.9 1.2 0.5 0.2
                       
Mean Across Covers Deep 115.5 47.7 226.3 93.5 226.3 93.5 0.8 0.3 1.4 0.6
Mean Across Covers Shallow 90.7 37.5 222.9 92.1 222.9 92.1 15.8 6.5 0.5 0.2

Lexington, Kentucky 
Continental Deep 204 84.4 227 94 228.8 94.7 10.2 4.2 0 0
Continental Shallow 181.2 76 231.2 96.8 228.8 95.8 64.4 26.9 0 0
Continental Mean 192.6 80.2 229.1 95.4 228.8 95.3 37.3 15.6 0 0
                       
Reemay Deep 198.2 82 227.2 94 226.2 93.6 17.8 7.4 0 0
Reemay Shallow 139.4 58.4 199.2 83.4 202.8 84.9 37.8 15.8 0 0
Reemay Mean 168.8 70.2 213.2 88.7 214.5 89.2 27.8 11.6 0 0
                       
White Plastic Deep 204 85.6 220.2 92.5 220.6 92.6 3.4 1.4 0 0
White Plastic Shallow 181.2 77.2 219.8 93.8 221.8 94.7 33 14.1 0 0
White Plastic Mean 192.6 81.4 220 93.1 221.2 93.6 18.2 7.8 0 0
                       
Mean Across Covers Deep 202.1 84 224.8 93.5 225.2 93.6 10.5 4.3 0 0
Mean Across Covers Shallow 167.3 70.5 216.7 91.3 217.8 91.8 45.1 18.9 0 0


Mean Across All Locations 

    10 days 14 days 16 days 16 Days 16 Days
    4/20/01
Number
Germinated
4/20/01
Percent
Germination
4/24/01
Number
Germinated
4/24/01
Percent
Germination
4/26/01
Number
Germinated
4/2601
Percent
Germination
4/26/01
Number
Spiral Roots
4/26/01
Percent
Spiral Roots
4/26/01
Number
H20 Damage
4/26/01
Percent
H20 Damage
   
Cover Dibble Depth
                       
Continental Deep 184.5 76.3 225.6 93.3 226.7 93.7 5.3 2.2 2.8 1.2
Continental Shallow 147 61.1 225.9 93.8 224.9 93.3 37.9 15.8 0.7 0.3
Continental Mean 165.7 68.7 225.7 93.5 225.8 93.5 21.6 9 1.8 0.7
                       
Reemay Deep 169.1 70.9 216.9 90.8 217.4 91 7.1 3 6 2.5
Reemay Shallow 130.3 54.1 212.3 88.1 214.5 89 30 12.5 1.5 0.6
Reemay Mean 149.7 62.5 214.6 89.4 215.9 90 18.6 7.7 3.7 1.5
                       
White Plastic Deep 156.5 65.2 225 93.6 225.5 93.8 1.9 0.8 0 0
White Plastic Shallow 111.1 46.7 223.6 93.4 225.1 94 19.6 8.2 0.3 0.1
White Plastic Mean 133.8 56 224.3 93.5 225.3 93.9 10.8 4.5 0.2 0.1
                       
Mean Across Covers Deep 170 70.8 222.5 92.6 223.2 92.8 4.8 2 2.9 1.2
Mean Across Covers Shallow 129.5 54 220.6 91.8 221.5 92.1 29.2 12.2 0.8 0.3

 

 

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