Due to people's unreasonable fertilization and manipulation in daily life, the land in our country has undergone extensive salinization. Through analysis and measurement of the land in China, the total area of ​​saline soil in China has been 99.13 million hectares. In the arable land of agricultural areas, not more than 100 million mu of saline soil is still the main cause of large-scale low-yield production. In the world, the area of ​​saline-alkaline soil is 9.5438 billion hectares. Therefore, the rational use of salt-alkali land and the development of changes are now grain. An important method of increasing production and increasing agricultural area is caused by unreasonable fertilization in most areas of China. Therefore, the use of soil testing and formulating fertilizers to measure nutrients during planting is scientifically reasonable. Sex fertilization has some help.
The soil testing and fertilizer application instrument can measure the conventional elements such as nitrogen, phosphorus, and potassium in the soil. Therefore, this instrument is also called the soil nitrogen, phosphorus and potassium detector. This instrument can also measure the soil salt content at the same time. Analysis, in the process of the determination of the most important is for the sample configuration, the two configuration methods are as follows:
1. Preparation of the test solution: Weigh 10.0 g of air-dried soil sample passed through a 2 mm sieve into a 100 ml conical flask, add 50 ml of carbon dioxide-free water, and shake it on the shaker (or vigorously with hands) for 3 minutes. Filtration is the test solution.
2. Preparation of standard mother liquor:
Soil Type Na2SO4(g) NaCL(g) NaHCO3(g) Volume (ml) Concentration (%)
Sulphate Soil 15.163 1.249 3.588 1000 2.0
Chloride soil 1.723 14.199 4.078 1000 2.0
Heavy Carbonate Soil 2.584 2.130 15.286 1000 2.0
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