The compounding effect of the compound fertilizer is more significant than the application of the single-ferment fertilizer. This concept of fertilization has been recognized and accepted by farmers. However, due to a variety of factors, most farmers do not know that even if they purchase qualified compound fertilizer, they will reduce or even reduce crops due to improper selection or improper application. Therefore, now on how to buy a suitable compound fertilizer, talk about a little superficial insight for farmers' friends:
1. Choose a suitable compound fertilizer based on local soil characteristics. For farmers who are located in alkaline soils in the north, acid compound fertilizers should generally be purchased; on the contrary, farmers with southern acid soils should use alkaline compound fertilizers; for soils with low organic matter content, generally Cooperate with the application of organic compound fertilizer or organic and inorganic compound fertilizer.
In addition, for the alkaline soil in the northwest, it is generally not suitable to select and apply the compound fertilizer produced by using 枸soluble phosphorus, potassium chloride and ammonium chloride as raw materials.
Second, purchase compound fertilizer according to the variety of crops. For field crops, NPK ternary compound fertilizer should generally be used; for economic crops such as vegetables and fruit trees, especially root crops, more potassium should be used, and NPK ternary compound fertilizer with higher potassium content should be used; Avoid chlorine crops such as grapes, potatoes, tobacco, sugar beets, etc. It is not appropriate to apply compound fertilizer with high chloride ion content produced by using potassium chloride or ammonium chloride as raw materials.
Third, choose compound fertilizer based on the nature of fertilizer. Farmer friends should learn to understand and master a little common sense about fertilizers, so that they can find out when they buy fertilizer.
For example, GB15063-2001 national standard stipulates that the effective nutrient content of compound fertilizer (composite fertilizer) is divided into high, medium and low: high concentration of NPK ≥40%, medium concentration of NPK ≥30%, low concentration of nitrogen and phosphorus Potassium content ≥ 25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%. The nutrient content is different, the quantity applied and the technical requirements are different, of course, the price is different.
Fourth, according to the fertilization method to buy compound fertilizer. In order to improve the fertilizer efficiency of the compound fertilizer, different dosage forms of compound fertilizer should be selected for different fertilization methods. For example, when making base fertilizer, it is necessary to purchase granular compound fertilizer, or to purchase compound fertilizer containing slow-release fertilizer, which has long fertilizer effect and is beneficial to increase nitrogen utilization rate. The effect of humic acid compound fertilizer is generally better than that of topdressing.
5. Purchase compound fertilizer based on the principle of balanced fertilization. Farmers' friends should usually contact agricultural technicians to understand the soil characteristics and the fertilizer requirements of crops. It is best to combine with soil testing and formula fertilization. According to the principle of balanced crop nutrition, according to the reasonable results of soil testing results, what is missing? Achieve balanced supply of crop nutrients. Finally, it should be noted that the compound fertilizer is relatively fixed, must not be blindly selected and applied, nor can it be applied as a single fertilizer to avoid unnecessary loss and waste. (China Fertilizer Information Network)
This article URL: What are the precautions for purchasing spring compound fertilizer in 2016?
Hematology analyzer is also called clinical blood cell analyzer, blood cell analyzer, blood cell analyzer, blood cell counter. The blood analyzer not only improves the accuracy of the experimental results, but also provides many experimental indicators, which play an important role in the diagnosis and differential diagnosis of diseases. Hematology analyzer is one of the most widely used instruments in hospital clinical testing.
Test items
Blood cell test refers to routine blood test, which is manual operation and counting under the microscope at first. It includes red blood cell, hemoglobin, white blood cell count and its classification, platelet count, etc. There are more than 20 items.
clinical significance
1. The blood analyzer is mainly used to detect various blood cell counts, white blood cell classification and hemoglobin content.
2. Hematocrit: obtained by multiplying the average volume of red blood cells by the red blood cell count.
3. Red blood cell distribution width: represents the degree of consistency of red blood cell size. When the red blood cell size is uneven, the red blood cell distribution width value increases, such as various types of nutritional deficiency anemia.
4. The three average indices of red blood cells are used to identify the type of anemia.
(1) The average hemoglobin content of red blood cells: increased in megaloblastic anemia, decreased in iron deficiency anemia, chronic blood loss anemia, uremia, chronic inflammation.
(2) Mean volume of red blood cells: increase in hemolytic anemia and megaloblastic anemia; decrease in severe iron deficiency anemia and hereditary spherocytosis.
(3) The average red blood cell hemoglobin concentration: decrease in chronic blood loss anemia, iron deficiency anemia; various diseases can be in the normal range. In megaloblastic anemia, the mean red blood cell volume increases, the mean red blood cell hemoglobin amount increases, the mean red blood cell hemoglobin concentration is normal, and the red blood cell distribution width increases.
5. Average platelet volume: the average volume of each platelet, the size of platelets is related to its function.
(1) Increased: seen in patients with idiopathic thrombocytopenic purpura, edema and proteinuria in late pregnancy.
(2) Decreased: seen in non-immune platelet destruction, aplastic anemia, thrombocytopenia repeated infection syndrome, chronic myeloid leukemia, etc.
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