Soil quality assessment standards, national standards for soil testing methods

The fees charged by third-party soil testing agencies are not fixed and can be affected by a variety of factors. For example, different testing items, different testing difficulties, the complexity of the required technology, and the number of samples required will all affect the charging standard of the institution.

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In general, soil testing.

The fees of third-party institutions mainly include the following parts:

1.Cost of testing items: Different testing items will carry out different laboratory tests and analyses on the soil, and the equipment and labor costs required will also be different, so there will be different charging standards.

Generally, the agency will set the fee based on the complexity of the project and the difficulty of the technology required.

2.Sample quantity fee: If the customer needs to test a large number of soil samples, then the agency will charge a certain percentage of the fee according to the number of samples. This part of the cost is also part of the cost of the institution, so the higher the number of samples, the lower the average cost of a single sample.

3.Other additional costs: In addition to the above two main costs, there may be some other additional costs charged by the soil testing third-party organization, such as sample transportation fees, report production fees, etc. These fees are also charged by the agency in order to cover its operating costs.

It should also be related to the type of soil.

Content from the user: 愛蕥萌.

National Standard Encyclopedia of Soil Testing Methods (84 species in total).

1 GB 11728-1989 Sanitary Standard for Copper in Soil 2 GB 12297-1990 Method for Determination of Available Phosphorus in Calcareous Soil 3 GB 12298-1990 Method for Determination of Soil Available Boron 4 GB 15618-1995 Soil Environmental Quality Standard 5 GB 19062-2003 Destruction of Chemical ** Soil Pollution Control Standard for Abandoned Chemicals in China (Trial).

6 GB 19615-2004 Destruction of Contaminant Content Standards in Chemical ** Environmental Soil Abandoned by Japan in China (Trial).

7 GB 6260-1986 Determination of total amount of rare earth oxide in soil 8 GB 7172-1987 Determination of soil moisture 9 GB 7173-1987 Total soil nitrogen determination (semi-trace Kelvin method).

10 GB 7833-1987 Determination of moisture content of forest soils11 GB 7836-1987 Determination of maximum moisture absorption of water in forest soils12 GB 7838-1987 Determination of permeability of forest soils13 GB 7839-1987 Determination of forest soil temperature14 GB 7843-1987 Determination of forest soil firmness15 GB 7844-1987 Determination of specific gravity of forest soils16 GB 7845-1987 Particle composition of forest soils ( Determination of mechanical composition) 17 GB 7846-1987 Determination of micro-aggregate composition of forest soils 18 GB 7852-1987 Determination of total phosphorus in forest soils 19 GB 7853-1987 Determination of available phosphorus in forest soils 20 GB 7854-1987 Determination of total potassium in forest soils 21 GB 7855-1987 Determination of slow-acting potassium in forest soils 22 GB 7856-1987 Determination of available potassium in forest soils 23 GB 7857-1987 Determination of organic matter in forest soil and calculation of carbon-nitrogen ratio24 GB 7858-1987 Determination of humus composition of forest soil 25 GB 7859-1987 Determination of pH value of forest soil 26 GB 7860-1987 Determination of exchange acid in forest soil 27 GB 7862-1987 Determination of lime application rate in forest soil 28 GB 7863-198755 gb t

Technical Indicators.

1) Measurement items.

Soil: moisture, pH, salt content, ammonium nitrogen, available phosphorus, available potassium, organic matter, alkaline hydrolyzable nitrogen, nitrate nitrogen, available calcium, available magnesium, available sulfur, available iron, available manganese, available boron, available zinc, available copper, available chlorine, available silicon, extended total nitrogen, total phosphorus, total potassium;

Fertilizers: nitrogen, phosphorus, potassium, extended organic matter, humic acid.

I hope it can help you with a link to the web page, which contains soil testing standards, which can be viewed by yourself.

b) Operating instructions.

Turn on the power switch, press the front and back buttons to enter the selection parameters, press the confirm button, the cursor returns to the main test interface, put the color developed solution into the corresponding color slot, press the OK button to test and print.

The five parameters of ammonium nitrogen, available phosphorus, available potassium, organic matter, and alkali hydrolyzable nitrogen have the function of expert fertilization, and after the test is completed, select expert fertilization Select planting crops Enter the target yield and draw scientific fertilization suggestions Print.

The instrument has built-in expert fertilization recommendations for 16 crops (rice, wheat, corn, sweet potato, soybean, peanut, cotton, rape, sesame, tobacco, sugar cane, spinach, green onion, garlic, apple, grape) and can be expanded. If you don't have the type of crop you need, you can contact our technical department to provide you with a full set of fertilization suggestions for inquiry.

The test results can be queried and printed in the history query.

On the data query interface, press and hold the "Return to Page" button for 5 seconds to clear all data in the data query column.

Legal analysis: The soil for landscaping planting should meet the soil conditions required for the growth of garden plants, and should not be mixed with various intrusions. Measures such as guest soil and improvement should be taken for the soil containing the above substances, and no visible intrusions should appear.

There should be no large area of impervious layer under the soil layer of landscaping planting soil, otherwise effective drainage and storage measures should be taken at the bottom according to the actual situation. Sludge and silt should not be directly used as landscaping land planting soil.

Legal basis: (DB11T 864-2012) "Landscaping Planting Soil Standard".

1. Terms and Definitions.

1. Landscaping planting soil.

It is used for planting in the garden.

Soil for greening of one- and two-year flowers, perennial flowers (perennial and bulbous flowers), lawn plants, bamboos, shrubs, trees and other plants.

2. Soil pH value.

The degree of acidity and alkalinity of the soil solution is expressed as the negative logarithm of the concentration of hydrogen ions in the soil solution.

3. The total salinity of the soil.

The total amount of soluble salts in the soil. Expressed as a percentage of mass (%).

4. Soil organic matter.

All carbon-containing organic matter in the soil, including various animal and plant residues, microorganisms and various organic substances decomposed and synthesized in the soil.

5. Hydrolyzed nitrogen.

Also known as "soil alkaline hydrolyzable nitrogen", it includes inorganic mineral nitrogen and relatively simple organic nitrogen that is easily decomposed in some organic substances, which is the sum of ammonium nitrogen, nitrate nitrogen, amino acids, amides and protein nitrogen that is easily hydrolyzed.

Legal analysis: There are 10 soil pollutant indicators in the current "Soil Environmental Quality Standard (GB15618-1995)", including 8 heavy metals (cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel) and 2 organochlorine pesticides (6.

Six. 6. DDT). The pollutant items specified in this standard include 8 heavy metals (cadmium, mercury, arsenic, lead, chromium, copper, nickel, zinc) and 3 organic pollutants (666, DDT, benzo[a]pyrene), a total of 11 indicators; The pollutant items for which the risk control value is specified include five indicators: cadmium, mercury, arsenic, lead, and chromium. The main reasons for the determination of soil contaminant indicators are:

The first is to retain 8 kinds of heavy metal indicators as regular items. It includes five heavy metal pollutants (cadmium, mercury, arsenic, lead, and chromium) that focus on protecting the quality and safety of agricultural products, and three heavy metal pollutants (copper, zinc, and nickel) that affect the growth of crops. The second is to retain the two indicators of 666 and DDT as optional test items.

Since China banned the use of 666 and DDT in agricultural production in 1983, the residues of the above two pollutants in the soil of agricultural land have been significantly reduced, and they will basically not become pollutants that affect the quality and safety of agricultural products such as rice and wheat. In view of the results of the national soil pollution survey, the detection rate of 666 and DDT in the soil in some areas is still a certain extent, and the above two pollutants are retained as the selection indicators, and their content changes and risks are monitored according to the actual situation. The third is to add the index of benzo[a]pyrene as a selection item.

China's national food safety standards stipulate the limit of benzo[a]pyrene content in agricultural products. There is a certain detection rate of benzo[a]pyrene in soil in China. Although there is no study that shows that B[a]P in soil is important for B[A]P in agricultural products such as rice and wheat**, it is still necessary to monitor the changes and risks of B[A]P content in soil.

Legal basis: Article 338 of the Criminal Law of the People's Republic of China Whoever discharges, dumps or disposes of radioactive wastes, wastes containing infectious disease pathogens, toxic substances or other harmful substances in violation of state regulations, and seriously pollutes the environment, is to be sentenced to up to three years imprisonment or short-term detention and/or a fine; where the consequences are especially serious, a sentence of between three and seven years imprisonment is to be given, and a concurrent punishment is to be given.

Legal Analysis: Soil environmental quality standards are the highest allowable levels of pollutants in soil. The residual accumulation of pollutants in the soil is limited to the extent that it does not cause fertility disorders of crops, excessive accumulation in the grains or edible parts (not exceeding food hygiene standards), or affect the environmental quality of soil, water bodies, etc.

Legal basis: Article 2 of the Standardization Law of the People's Republic of China The standards (including standard samples) mentioned in this law refer to the technical requirements that need to be unified in the fields of agriculture, industry, service industry and social undertakings.

Standards include national standards, industry standards, local standards, group standards, and enterprise standards. National standards are divided into mandatory standards and recommended standards, and industry standards and local standards are recommended standards.

Mandatory standards must be enforced. The State encourages the adoption of recommended standards.