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Compound fertilizers, literally, refer to fertilizers that contain at least two elements of nitrogen, phosphorus, and potassium. That is to say, those containing two elements are binary compound fertilizers, while those containing three elements are ternary compound fertilizers. Compound fertilizers are divided into three types based on their concentrations, namely low concentration compound fertilizers, medium concentration compound fertilizers, and high concentration compound fertilizers. Different classifications also contain different nutrients. Testing standard for compound fertilizers GB/T14540-2003: Copper, iron, manganese, zinc, boron Determination of Molybdenum Content GB/T17767.1-2008 Methods for Determination of Organic Inorganic Compound Fertilizers Part 1: Determination of Total Nitrogen Content GB/T17767.2-2010 Methods for Determination of Organic Inorganic Compound Fertilizers Part 2: Determination of Total Phosphorus Content GB/T17767.3-2010 Methods for Determination of Organic Inorganic Compound Fertilizers Part 3: Total Potassium Content GB/T18877-2020 Organic Inorganic Compound Fertilizers GB/T19203-2003 Calcium, Magnesium Determination of sulfur content GB/T22924-2008 Compound fertilizers (compound fertilizers) Determination of biuret content in compound fertilizers GB/T24890-2010 Determination of chloride ion content in compound fertilizers GB/T24891-2010 Determination of particle size in compound fertilizers GB/T8571-2008 Preparation of laboratory samples for compound fertilizers GB/T8572-2010 Determination of total nitrogen content in compound fertilizers Titration method after distillation GB/T8573-2017 Determination of effective phosphorus content in compound fertilizers GB/T8574-2010 Determination of potassium content in compound fertilizers Potassium tetraphenylborate gravimetric method GB/T8576-2010 Free phosphorus content in compound fertilizers Determination of water content - Vacuum oven method GB/T8577-2010- Determination of free water content in compound fertilizers - Karl Fischer method HG/T4217-2011 Inorganic encapsulated compound fertilizers (composite fertilizers) HG/T5331-2018 Chelated trace element compound fertilizers (composite fertilizers) HG/T5933-2021 Humic Acid Organic Inorganic Compound Fertilizers NY/T1376-2007 Determination of Biuret Content in Compound Fertilizers Spectrometric Method NY481-2002 Organic Inorganic Compound Fertilizers SN/T3372-2012 Determination of Lead, Cadmium, Chromium, Nickel, Arsenic, and Mercury in Organic Inorganic Compound Fertilizers Inductively Coupled Plasma Atomic Emission Spectrometry SN/T3793-2014 Determination of Total Phosphorus and Potassium Content in Compound Fertilizers X-ray Fluorescence Spectrometry Function of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% inspection and testing process:1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate 4. Free initial testing, with no testing fees charged 5. Self service order delivery for free on-site sampling 6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China
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