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Preventing High pH (Future)

Preventing High pH (Future). Avoid NO 3 - fertilizers Acidify water from 5.8 to 5.1 Reduce lime charge in substrate. Low pH Action Steps. Stop neutralizing alkalinity in water Switch from NH 4 + to NO 3 - Apply flowable limestone products: start with 1 quart per 100 gallons

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Preventing High pH (Future)

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  1. Preventing High pH (Future) • Avoid NO3- fertilizers • Acidify water from 5.8 to 5.1 • Reduce lime charge in substrate

  2. Low pH Action Steps • Stop neutralizing alkalinity in water • Switch from NH4+ to NO3- • Apply flowable limestone products: • start with 1 quart per 100 gallons • mist solution off of foliage

  3. Preventing Low pH (Future) • Avoid NH4+ fertilizers • Inject potassium bicarbonate: • start with 13.4 oz per 1,000 gal • supplies 1.0 meq/L alkalinity • supplies 39 ppm K • Increase lime charge in substrate

  4. Monitoring EC • Set target EC ranges for crop being grown • Account for growth stages • Establishment, active growth, and bloom • Set upper and lower ranges

  5. Active Growth Establishment Mature Plant Growth Cycle

  6. PourThru EC’s • Crops vary in requirements • Low: 1.0 - 2.6 mS/cm • begonia, cineraria, impatiens • Moderate: 2.0 - 3.5 mS/cm • Easter lily, geranium, kale • Heavy: 2.6 - 4.6 mS/cm • chrysanthemum, poinsettia

  7. High EC Action Steps • Decrease fertilization rate • Decrease fertilization frequency • Leach

  8. Low EC Action Steps • Increase fertilization rate • Increase fertilization frequency

  9. Questions ? ? ? ? ? ? ? ?

  10. Check our WEB sites NCSU Floriculture “Floricultureinfo.com” “Pourthruinfo.com” Horticultural Substrates Laboratory “substrateslab.com”

  11. Bottom Line?

  12. M&M’s Just Do It

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