133 Soil Analytical Test EC (in 1:2 soil:water). This is a soil salinity test. This method quantifies the amount of dissolved salts by measurement of the electrical conductivity of a soil saturated paste extract. The relationship between electrical conductivity and soluble salts is approximate due to differences in equivalent weights, ion equivalent conductivities, and relative proportions of major solutes in the paste extracts. Salt tolerance crop data is generally expressed in terms of the electrical conductivity of the saturation paste extract and used to assess the potential of soluble soil salts which may limit crop productivity. The method detection limit is approximately 0.01 dS/m (mmhos/cm) and is generally reproducible within ± 7%. |
221 Water Analytical Tests ECw. This method quantifies the amount of dissolved salts by measurement of the electrical conductivity (ECe ) of the water solution. Salt tolerance crop data is generally expressed in terms of the (ECe ) and used to assess the potential of soluble salts which may limit crop productivity. The method detection limit is approximately 0.01 dS/m and is generally reproducible within ± 7%. |
108 Soil Analytical Test Zn, Mn, Fe, Cu. This is a soil fertility test. The DTPA micronutrient extraction method is a non-equilibrium extraction for estimating the potential soil availability of zinc, copper, manganese, and iron. The extracts are analyzed by ICP-AES. The method has a detection limit of approximately 0.1 mg/kg for zinc, copper, manganese, and iron and is generally reproducible within 10% for copper and zinc and 15% for iron and manganese. |
118 Soil Analytical Test x-Ca. This is a soil fertility test. This method determines the concentration of exchangeable calcium in the soil saturation paste extract using atomic absorption spectrometry (AAS) or Inductively Coupled Plasma Emission Spectrometry (ICP-AES). The method detection limit is approximately 0.02 mmolc/L on a solution basis and it is generally reproducible within ± 7%. |
109 Soil Analytical Test x-K, x-Na, x-Ca, x-Mg. This is a soil fertility test. This method quantitatively determines the concentration of dissolved Cations in the soil saturation paste extract using atomic absorption spectrometry (AAS) or Inductively Coupled Plasma Emission Spectrometry (ICP-AES). The relationship between cation solution concentrations and exchangeable cations in the soil, is used to estimate exchangeable sodium percentage (ESP) from the SAR. The method detection limit for these cations is approximately 0.02 mmolc/L on a solution basis and it is generally reproducible within ± 7%. |
117 Soil Analytical Test x-Mg. This is a soil fertility test. This method quantitatively determines the concentration of exchangeable Magnesium in the soil saturation paste extract using atomic absorption spectrometry (AAS) or Inductively Coupled Plasma Emission Spectrometry (ICP-AES). The method detection limit is approximately 0.02 mmolc/L on a solution basis and it is generally reproducible within ± 7%. |
119 Soil Analytical Test x-K. This is a soil fertlity test. This method determines the amount of exchangeable Potassium in the soil. Cations are quantitated by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). This method has detection limits of approximately of 1 ppm or 0.01 meq/100g. |
120 Soil Analytical Test x-Na. This is a soil fertility test. This method quantitatively determines the concentration of exchangeable Sodium in the soil saturation paste extract using atomic absorption spectrometry (AAS) or Inductively Coupled Plasma Emission Spectrometry (ICP-AES). The method detection limit is approximately 0.02 mmolc/L on a solution basis and it is generally reproducible within ± 7%. |
Soil Quality Packages Basic Nutrient Package plus mild acid extraction and analysis of inorganic P, total P, K, Ca, Fe and Al |
301 Plant Analytical Tests This is a tissue or petiole analysis for nitrate, phosphate, and potassium. NO3-N, PO4-P, K. |
302 Plant Analytical Tests This is a tissue or petiole analysis for nitrate, phosphate, ammonium and potassium. NO3-N, NH4-N, PO4-P, K. |
303 Plant Analytical Tests This is a combined extractable nutrients test including sodium and chlorine. NO3-N,PO4-P, SO4-S, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn, Na, Cl |
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