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Vegetation control effects on the soil/plant/microbial system of loblolly pine plantations

Vegetation control effects on the soil/plant/microbial system of loblolly pine plantations. Michael Blazier, Ph.D. SFA Herbicide Workshop December 7, 2005. Ecological function of herbicides. Reducing competing vegetation increases soil moisture

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Vegetation control effects on the soil/plant/microbial system of loblolly pine plantations

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  1. Vegetation control effects on the soil/plant/microbial system of loblolly pine plantations Michael Blazier, Ph.D. SFA Herbicide Workshop December 7, 2005

  2. Ecological function of herbicides • Reducing competing vegetation increasessoil moisture • Important limitation to pine growth on sandy soils, areas with low rainfall • Higher soil moisture in summer promotes growth of high-density, high-quality wood • Reducing competing vegetation re-distributes nutrients to crop trees • Allows soil to reach its fullest potential for meeting crop tree nutrient demand • Most southern pine forest grows on nutrient-poor soils

  3. Ecological function of herbicides • Loblolly pine plantation N supply often out of sync with N demand

  4. Ecological function of herbicides • Improving crop tree growth with herbicide: • Reducing underbrush = removal of main nutrient competition = better growth?

  5. Ecological function of herbicides • Improving crop tree growth with herbicide: • Reducing underbrush = removal of main nutrient competition = better growth? NOT THE WHOLE ECOLOGICAL STORY…

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