| 31. | Still, witchweed has demonstrated a wide tolerance for soil types if soil temperatures are favorably high.
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| 32. | A rough approximation of the initial soil temperature is the average daily temperature for the region.
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| 33. | Workers may only forage for several minutes when soil temperature is well above their thermal maxima.
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| 34. | A 2-to 3-inch layer of mulch will conserve soil moisture, moderate soil temperatures and discourage weeds.
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| 35. | It also conserves moisture and maintains soil temperature conducive to the growth of soil building micro-organisms.
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| 36. | Ideal soil temperature for germination is 60-65 degrees.
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| 37. | They prefer soil temperatures of at least 75 degrees and are very sensitive to ultraviolet light.
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| 38. | The nymphs emerge on a spring evening when the soil temperature at about depth is above.
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| 39. | "Don't be in too big of a hurry until the soil temperature gets around 63 degrees.
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| 40. | The color of the ground cover and its insulating properties have a strong influence on soil temperature.
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