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Item 14: Descripción del Segundo Ring Test 2019

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Segundo Taller de la Red Latinoamericana de Laboratorios de Suelos (LATSOLAN)
12-14 marzo 2019
Ciudad de México

Published in: Education
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Item 14: Descripción del Segundo Ring Test 2019

  1. 1. Item 14: Description of the Second Ring Test 2019 LATSOLAN-SEALNET Sr. Armando Guerrero, México Sra. Nopmanee Suvannang, Thailand
  2. 2. Propuestas adicionales para el Segundo RING TEST (SEALNET-LATSOLAN) SEALNET pH water 1:2.5 OC (WB) Exch Ca,Mg,K, Na(NH4OAc) Total C Total N Avail P (Olsen, Bray) EC 1:5 LATSOLAN pH agua 1:2.5 COx (WB) Ca, Mg, K , Na (NH4OAc) C total N total N total (Kj) CaCO3 P intercambiable (Olsen?, Bray?) CE 1:5?
  3. 3. Test Item for PT 2018 2019 2020 2018 2019 2020 2018 2019 2020 pHwater 1:2.5 × × × × × OC (WB) × × × × × OC (dry combustion) × × × Avail P (Olsen) × × × × Exch K × × × × × Exch Ca × × × × Exch Mg × × × × Exch Na × × × CEC × × × EC 1:5 × × × Avail P (Bray 1) × × × Avail P (Bray 2) × × × GLOSOLAN SEALNET LATSOLAN
  4. 4. Core questions to be answered - What is the Participation scheme - How the sample will delivery to the participating laboratories - What is the decisions on SOPs to be used
  5. 5. GSP purchase the soil samples and sent to participating laboratories Structure of Global PT 2019 sent by hand (LATSOLAN) sent by FAO office (Other regions) GSP purchase the soil samples and sent to participating laboratories participating labs analyte PT samples
  6. 6. SEALNET 18 LATSOLAN (11 Central America + 9 South America) 20 PACIFIC 3 EUROPE and EURASIA : 8? AFRICA 50? NENA 4 NORTH AMERICA 1 TOTAL 104 Region Participating Laboratory no of labs participate 2019
  7. 7. What is the decisions on SOPs to be used • SEALNET-LATSOLAN SOP • Individual lab SOP • 1 & 2
  8. 8. pH water 1:2.5 Region Amount ofsoil volume ofwater ratio type ofwater particle size (mm) type of agitation Agitation time restingtime againshake andreadin the suspension electrode immersiondepth Form of expression ofthe result SEALNET- LATSOLAN SOPpH 10g 25ml 1:2.5 Deionized/distilled water The pHof the watershould be between5.6 and7.0 2mm shaker 10min 60min yes insertthe electrode intothe suspension 1decimal
  9. 9. Region Mass range of soil sample analyzed, in g (minimum- maximum) Particle size of the soil sample (mm) Molarity of Potassium Dichromate that uses ml of dichromate used (range, according to the soil mass used) ml of Sulfuric Acid used (range, according to the mass used) ratio Add external heat? If yes, how long, what temperature (° C) and by what means? Time (min) of rest of the reaction amount of water use (ml) Type of water used, according to ASTM need addition filtration Does your method require adding Phosphoric Acid? If you use Phosphoric Acid, how many mL? How do you evaluate the excess of Dichromate? SEALNET_ LATSOLAN SOP OC (WB) 0.5 -1.0 g of air dry soil (adjust if necessary,w ith colour of soil) 0.5 mm sieve 0.167 M or 1 N 10 ml 20 ml 1:2 no - 30 min 200 ml deionized/ distilled water filter the suspension using an acid resistant filter paper (e.g. Whatman No. 540), if experience shows that the end point of the titration cannot otherwise be clearly discerned. yes if diphenylami ne indicator is used 10 mL of 85% H3PO4. titration OC (WB)
  10. 10. Region massofsoil sample analyzeding Particle size of the soil sample (mm) extractant Totalvolume ofextractor solution ratio addchacoal How do you perform the extraction? Agitationtime andnumberof times Ifyoufilter, what#offilter paperdoyou use? time to develop colour wavle length used calculation base onair dry soilor ovendry SEALNET 5g 2mm 0.5M NaHCO3 at pH8.5 100ml 1:20 Addahalf teaspoonofP- free carbon black(approx. 0.5g). shaking 30min at25 ͦC whatmanNo 42 60min 882nm ovendry soil basis LATSOLAN P (Olsen)
  11. 11. Regional pH of Ammonium Acetate mass of soil sample analyzed in g Particle size of the soil sample (mm) Total volume of extractor solution ratio How do you performthe extraction? With what type of equipment does the agitation? How do you separate the phases? Agitation time and number of times If you filter, what # of filter paper do you use? What conc do you use for K calibration? calculatio n base on air dry soilor oven dry SEALNET ammonium acetate (pH=7, N=1) 2.5 g 2 mm 25 ml 1:10 reciprocating shaker for 30 minutes reciprocating shaker filter 30 min only 1 time Whatman No. 2 filter paper contain 0, 5, 10, 15, 20, and 40 ppmK air dry soil LATSOLAN ammonium acetate (pH=7, N=1) 5 g 2 mm 100 ml (33 ml* 3 time shaking) 1:20 reciprocating shaker for 10 minutes reciprocating shaker centriguge and filter 10 min repeat 3 time Whatman 2, 41 or similar paper. contain 0, 5, 10, 20, 30, and 40 ppmK air dry soil Exch Ca, Mg, K and Na (NH4OAc)
  12. 12. EC 1:5 Region Amount of soil volume of water ratio temp type of water particle size (mm) type of agitation shaking time filter yes/No resting time again shake and read in the suspensio n electrode immersion depth Form of expressi on of the result American Society of Agronomy , Inc. and Soil Science Society of America, Inc. Soil AnalysisPart2: Electrical Conductivity,1982, USA 10 g 50 ml 1:5 Deionized/distilled water The pH of the water should be between 5.6 and 7.0 2 mm shaker 60 min yes - no insert the electrode into the clear solution 1 decimal 10 g 50 ml 1:5 Deionized/distilled water The pH of the water should be between 5.6 and 7.0 2 mm shaker 30 min yes - no insert the electrode into the clear solution 1 decimal Bower, C.A. and L.V. Wilcox. 1965. Soluble Salts. In Black, C.A., et al., Eds., Methods of Soil Analysis, Part 2, American Society of Agronomy, Madison, p. 933-951. 10 g 50 ml 1:5 Deionized/distilled water The pH of the water should be between 5.6 and 7.0 2 mm shaker 60 min - - no insert the electrode into the clear solution 1 decimal ISO 11265_1994 20 g 100 ml 1:5 20 ͦ C Deionized/distilled water The pH of the water should be between 5.6 and 7.0 2 mm shaker 30 min yes - no insert the electrode into the clear solution 1 decimal
  13. 13. Gracias por su atención

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