// Peat soil testing molten salt content testing

 Shenzhen set of universal soil environmental testing soil testing fruit and vegetables and flowers soil testing soil testing set of universal Chen: 180-2871-9379 1. Moisture: burning weight loss, alcohol use high-temperature combustion, evaporation of soil moisture by loss of water calculation of soil moisture. 2. organic matter: by sulfuric acid - potassium dichromate after dilution with water oxidation of organic matter in the soil heat generated in the amount of color trivalent chromium ion colorimetric test. 3. Effective nitrogen, phosphorus and potassium nutrient leaching agents joint application to extract soil available nitrogen, phosphorus, potassium after nitrogen application indophenol blue method, phosphorus anti colorimetric molybdenum, antimony potassium potassium tetraphenylborate using turbidimetric measurement method. Neutral reagents joint action calcareous soil leaching agent (north) as follows: H20: The main ammonia nitrogen leaching; Na2SO4: main leaching of nitrate NaOAc: main extraction K; NaHCO3: main extraction available the role of soil phosphate reagents joint extraction agent (South) as follows: H20: mainly ammonia nitrogen leaching: NaF: main leaching available P; Na2S04: mainly nitrate leaching; EDTA: main leaching of potassium and trace elements Na0Ac: main leach potassium (b) methods of operation (for the type of soil and fertilizer meter YN) 1. determination of moisture content (1) burn before Lvhe heavy W1. (2) Samples (about 5g) + Lvhe weight W2. (3) plus 5 ~ 10ml alcohol burning, to be extinguished plus 5ml alcohol burning, extinguish after sample weight aluminum case + W3. (4) Calculation formula: Moisture (%) = (w2-w3) ÷ (W3-W1) × 100% 2.pH measured 25g sample + 25ml water, stirring, measuring pH paper after standing for half an hour. 3. Determination of organic matter (1) Preparation of a blank solution: draw water 3ml, potassium dichromate solution 10ml, 10ml to 100ml flask of concentrated sulfuric acid, and after half a minute shake above 25 ℃ to stand for 20 minutes, add water, 25ml, 10ml to draw another flask, add slow oxidizer 2.5ml, shake spare. (2) Preparation of standard solution: 0.5% carbon lessons standard solution 3ml, and the rest with blank solution was prepared. (3) Preparation of test solution: Weigh 1g soil plus water flask after adding 3ml, the rest of the filtered solution was prepared with a blank. (4) colorimetric: ① Select the filter value is 4, set the blank solution with the light path, followed by "colorimetric" key to switch to a function, adjust the display to 100%. ② Press "colorimetric" key function to switch to No. 3, set the standard solution in the light path, press key to adjust the LCD is 26. ⑧ home reading test solution in the light path, then the display is the organic matter content (‰). 4. Preparation of test solution available nutrients measured in available nutrients (1): Weigh 2.5g soil to 100ml flask, add soil leaching agent 25ml, concussion 5 minutes, filtered in flask. (2) Determination of available phosphorus: Pipette extraction agent 1m1, soil standard solution 1ml, soil test solution in three vials of 1ml, 2ml of water and then added to each, followed by adding soil phosphorus and 5 drops of a masking agent, soil phosphorus reagent 5 drops, reducing a drop of soil available phosphorus, shake, 10 minutes after the transfer to the measurement cuvette. ① blank solution filter selection 6, the function switch to one, adjust the display to 100%. ② standard solution function switches to 3, adjust the display to 24. ③ determination of test solution, the instrument displays the value that is available phosphorus content (mg / kg). (3) Determination of K: The lessons were leaching agent 2ml, standard solution 2ml, test solution 2ml in three small glass bottles, followed by adding two drops of soil potassium masking agent, soil potassium help masking agent 6 drops 4 drops of potassium soil turbidity agent, shake, and immediately transferred to the assay cuvette. ① blank solution filter selection 6, the function switch to one, adjust the display to 100%. ② standard solution function switches to 3, adjust the display to 140. ③ determination of test solution, the instrument displays the value is the potassium content (mg / kg). 5. reagent preparation (1) soil leaching agent preparation: a bag of soil leaching agent north, after the dissolution of the volume to 500mL. (2) the preparation of potassium dichromate solution: Take potassium dichromate 8g, after the dissolution of the volume to 100mL. (3) 0.5% carbon standard solution preparation: a bag of glucose powder, add water 40ml, concentrated sulfuric acid, 10ml, set the volume to 100ml. (4) preparation of soil mixed standard solution: lessons: soil mixed standard solution (stock solution) 1ml, diluted to 100ml with soil leaching agent. (5) Slow organic oxidizing agent preparation: organic slow oxidant 10g, add water l0mL, stirring to dissolve, cooled out the supernatant. Best used with the distribution. Two, M3 assay (a) the basic principles of phosphorus, potassium, calcium, magnesium, iron, manganese, copper, zinc, boron: joint extraction agent 0.2mol / LHOAc-0.25mo1 / L. NH4N03 formed a strong buffer system pH 2.5, and leached exchangeable -K, Ca, Mg, Na, Mn, Zn and other cations; 0.015mol / LNH4F-0.013mol / LHN03 regulatable P from Ca, Al, Fe inorganic phosphorus source desorption; 0.001mol / LEDTA leachable chelated Cu, Zn, Mn, Fe, etc. So once M3 extraction method can be extracted in a variety of soil nutrients phosphorus, potassium, calcium, magnesium, iron, manganese, copper, zinc, boron, etc. Extracted phosphorus anti colorimetric determination of molybdenum, antimony, potassium, calcium, magnesium, iron, manganese, copper and zinc by atomic absorption spectrophotometry, colorimetry boron with curcumin, available nitrogen: efficient nitrogen include ammonia and nitrate nitrogen, with 2mol / LKCI extract as measured by ammonia nitrogen indophenol blue method, nitrate directly measured by UV spectrophotometer at a wavelength of 210nm. (B) A method of operating phosphorus, potassium determination (1) extraction: amount of 2.50ml air-dried soil (2mm through a nylon mesh) in a plastic cup, added 25.OmlMehlIch3 extractant, stirred on a stirrer 5 minutes . Then dry filtration, the filtrate was collected in a plastic bottle 50.0ml. The entire extraction process should be carried out at a constant temperature, the temperature control at 25 ± 1 ℃. (2) quantitative: When measuring phosphorus, Imbibe 2.00 ~ 10.00ml soil leachate (varies depending on the level of fertility) in 50ml volumetric flask, add water to about 30ml, adding 5.00ml molybdenum, antimony anti reagent color, volume shake. After 30 minutes, the color, the color at 880nm than at. Such as lower winter temperatures, keep the color when the temperature above 15 ℃, the best in the heated indoor color, in order to accelerate the speed of color. Measured while doing blank correction. Working curve: Imbibe 5mg / L P standard solution 0,1.00,2.00,4.00,6.00,8.00ml, were placed in 50ml volumetric flask, add water to about 30ml, adding 5.00ml molybdenum, antimony anti reagent color, volume shake uniform. After 30 minutes, the color, the color at 880nm than at. When measuring potassium M3 leachate directly in atomic absorption spectrophotometer. Working curve: Imbibe l00mg / L K standard stock solution 0,1,2.5,5,10,15,20ml, were placed in 50ml volumetric flask, with Mehlich 3 extractant volume, shake, that was zero, 2,5,10,20,30,40mg / L. K standard series solution. 2. Determination of available nitrogen (1) extraction: plastic cup, add 50.0mL2mol / LKCl leaching agent, stir in the blender for 5 minutes. Then dry filtration, the filtrate was collected in 50 ml plastic bottles. (2) quantitative: When measuring ammonia nitrogen, take 3 ml, and the filtrate was added 4ml. Alkaline phenol solution to a sample cup, then add 10ml sodium hypochlorite solution, placed 3min, with a spectrophotometer at a colorimetric assay at 630nm. While doing blank correction. Working curve: Imbibe 1000mg / LNH4-N standard solution 0,0.5,1.0,2.0,4.0ml, were placed in 100 ml flask, the volume shake. When measuring nitrate, draw 10mL. Filtrate, respectively, in 21Onm and read the absorbance is measured at 275nm. N03- enough to the main A210 absorbance and organic impurities; A275 is the absorbance of organic matter, because N03- no longer absorb at 275nm. But organic absorbance at 275nm absorbance at 210nm than at smaller R times, it will be corrected for organic matter A275 after proper absorbance at 210nm, is subtracted from the A210, that was N03- absorbance at 210nm (⊿ A). Different regions have different R-values, and generally 3.6.