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Soil Temperature
<ul><li>Temperature key to successful germination </li></ul><ul><li>Should guide vegetable planting schedule </li></ul>
<ul><li>Soil – not air – temperature triggers germination </li></ul><ul><li>Soil temperature changes gradually, even thoug...
<ul><li>Dates and rates for soil warm-up vary each year </li></ul><ul><li>Often vary within single yard or garden </li></ul>
Factors that affect <ul><li>Exposure to sunlight </li></ul><ul><li>Texture </li></ul><ul><li>Moisture content </li></ul><u...
Method <ul><li>Metal probe thermometer </li></ul><ul><li>with flat dial </li></ul><ul><li>(not oven thermometer) </li></ul...
 
Method <ul><li>Insert 2 inches into soil for early season, small seeded vegetables </li></ul><ul><li>Greens, beets, brocco...
Method <ul><li>Insert 4 inches for warm season vegetables </li></ul><ul><li>Tomatoes, eggplants, peppers, cucumbers, squas...
Repeat performance <ul><li>Take temperature at same time each day for several days and average </li></ul><ul><li>Best time...
<ul><li>Strong, long-lasting cold front can take soil temperatures down but it happens slowly.  </li></ul><ul><li>Reaching...
When to plant <ul><li>Cool season crops - 40-45 degrees </li></ul><ul><li>Warm season crops -  50-55 degrees  </li></ul><u...
<ul><li>Being planted too early isn’t always fatal for seeds </li></ul><ul><li>Simply sit and wait for soil to warm </li><...
<ul><li>Warm-loving crops –  </li></ul><ul><li>May be damaged if the temperature falls much </li></ul>
<ul><li>Do NOT leave thermometer in ground </li></ul><ul><li>Clean and store indoors between readings </li></ul>
<ul><li>http://www.greencastonline.com/SoilTempMaps.aspx </li></ul><ul><li>http://aggie-horticulture.tamu.edu/seeds/ </li>...
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Soil temperature

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Soil Temperature
Fruit and Vegetable Science
K. Jerome

Published in: Education, Technology, Business
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Transcript of "Soil temperature"

  1. 1. Soil Temperature
  2. 2. <ul><li>Temperature key to successful germination </li></ul><ul><li>Should guide vegetable planting schedule </li></ul>
  3. 3. <ul><li>Soil – not air – temperature triggers germination </li></ul><ul><li>Soil temperature changes gradually, even though air temperature fluctuates wildly </li></ul>
  4. 4. <ul><li>Dates and rates for soil warm-up vary each year </li></ul><ul><li>Often vary within single yard or garden </li></ul>
  5. 5. Factors that affect <ul><li>Exposure to sunlight </li></ul><ul><li>Texture </li></ul><ul><li>Moisture content </li></ul><ul><li>Surface level (low-lying, flat, mounded) </li></ul>
  6. 6. Method <ul><li>Metal probe thermometer </li></ul><ul><li>with flat dial </li></ul><ul><li>(not oven thermometer) </li></ul><ul><li>Available at garden supply, </li></ul><ul><li>auto supply stores </li></ul><ul><li>compost thermometer </li></ul>
  7. 8. Method <ul><li>Insert 2 inches into soil for early season, small seeded vegetables </li></ul><ul><li>Greens, beets, broccoli, Brussels sprouts, cabbage, carrots, cauliflower, leeks & onions, peas, radishes, turnips </li></ul>
  8. 9. Method <ul><li>Insert 4 inches for warm season vegetables </li></ul><ul><li>Tomatoes, eggplants, peppers, cucumbers, squash, corn, melons </li></ul>
  9. 10. Repeat performance <ul><li>Take temperature at same time each day for several days and average </li></ul><ul><li>Best time - mid-day – between 10 and 11 </li></ul><ul><li>Take in several locations and average </li></ul>
  10. 11. <ul><li>Strong, long-lasting cold front can take soil temperatures down but it happens slowly. </li></ul><ul><li>Reaching 45 or 55 degrees usually means it’s safe to plant </li></ul>
  11. 12. When to plant <ul><li>Cool season crops - 40-45 degrees </li></ul><ul><li>Warm season crops - 50-55 degrees </li></ul><ul><li>Must consider risk of killing frost after seeds emerge </li></ul>
  12. 13. <ul><li>Being planted too early isn’t always fatal for seeds </li></ul><ul><li>Simply sit and wait for soil to warm </li></ul>
  13. 14. <ul><li>Warm-loving crops – </li></ul><ul><li>May be damaged if the temperature falls much </li></ul>
  14. 15. <ul><li>Do NOT leave thermometer in ground </li></ul><ul><li>Clean and store indoors between readings </li></ul>
  15. 16. <ul><li>http://www.greencastonline.com/SoilTempMaps.aspx </li></ul><ul><li>http://aggie-horticulture.tamu.edu/seeds/ </li></ul>
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