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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 David Wm. Reed Department of Horticultural Sciences Texas A&M University
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
1 Where Do All the Nutrients Come From?
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
2 Meters Used pH EC alkalinity kit
2 Meters Used Combination EC & pH Meter
3 Water: Soluble Salts and EC
4 Water: Alkalinity
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
7 Soil/Media: pH
7 Soil/Media: Soluble Salts (EC)
8 Graphical Tracking pH and EC
8 Graphical Tracking of EC
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
9 Selecting a Fertilizer Based on the Form of Nitrogen
9 Selecting a Fertilizer Based on the Form of Nitrogen
10 Selecting a Fertilizer Based on the Form of Nitrogen
10 Fertilizer Label Lists Potential Acidity Label Fertilizer Analysis
11 Micronutrients in Acid Vs. Alkaline Soil(especially heavy metals: Fe, Mn, Zn, Cu)
11 Which Chelate to Use?
11 Which Chelate to Use?
11 Fertilizer Label Lists Chemicals Used
12 Rose Rootstocks Tolerance to AlkalineSoil
12 Rose Rootstocks Tolerance to AlkalineSoil
13 EarthKindTM Landscape Roses(http://aggie-horticulture.tamu.edu/earthkindrose/index.html)
13 EarthKindTM Landscape Roses
13 Belinda’s Dream(developed by Dr. Robert Basye)