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Beyond N-P-K: Chemistry of Soil and Water and How they Effect our Fertilizer Practices. David Wm. Reed Department of Horticultural Sciences Texas A&M University. 1. 17 Essential Elements. Supplied Naturally (by H 2 0, O 2 , CO 2 ) C, H, O Macronutrients N, P, K, Ca, Mg, S

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beyond n p k chemistry of soil and water and how they effect our fertilizer practices

Beyond N-P-K:Chemistry of Soil and Water and How they Effect our Fertilizer Practices

David Wm. Reed

Department of Horticultural Sciences

Texas A&M University

17 essential elements

1

17 Essential Elements

Supplied Naturally (by H20, O2, CO2)

C, H, O

Macronutrients

N, P, K, Ca, Mg, S

Micronutrients or Trace Elements

Fe, Cu, Mn, Zn, B, Mo, Cl, Ni

water ec ph alkalinity

2

Water: EC, pH Alkalinity
  • Collect water sample
  • Meters Used
    • pH: pH meter
    • Soluble Salts or EC: conductivity meter
    • Alkalinity: alkalinity test kit or paper
  • Compare reading to Interpretation Table
meters used

2

Meters Used

pH

EC

alkalinity kit

meters used1

2

Meters Used

Combination

EC & pH

Meter

soil media soluble salts ec ph

5

Soil/Media: Soluble Salts (EC) & pH
  • Collect soil/medium sample below surface
  • Extract with water (1:2 dilution)
  • Filter
  • Meters Used
    • pH: pH meter
    • Soluble Salts or EC: conductivity meter
  • Compare reading to Interpretation Table
selecting a fertilizer based on the form of nitrogen

9

Selecting a Fertilizer Based on the Form of Nitrogen
  • Nitrogen exists in two forms
    • Ammoniacal (NH4+, urea)
    • Nitrate (NO3-)
  • Nitrogen form used affects
    • Type of growth
    • Type fertilizer, acid vs. basic
    • pH of the soil or growing medium
slide23

11

Fertilizer Label Lists Chemicals Used

earthkind tm landscape roses http aggie horticulture tamu edu earthkindrose index html

13

EarthKindTM Landscape Roses(http://aggie-horticulture.tamu.edu/earthkindrose/index.html)