Compound fertilizers increase production and income than single fertilizers, which has long been recognized by farmers. However, how to purchase high-quality compound fertilizer to achieve the purpose of increasing production and saving money has not yet been mastered by the majority of farmers. Therefore, how to purchase high-quality compound fertilizer according to soil characteristics, fertilizer characteristics, agricultural production status, etc. is what farmers need to know and master.
First, scientific selection of compound fertilizer according to soil properties
For soils with slightly alkaline and low organic matter content (the soil pH is generally around 8.0) and effective nitrogen and phosphorus deficiency, acidic compound fertilizers such as monoammonium phosphate or humic acid NPK fertilizers and nitrogen and phosphorus should generally be used. Compound fertilizer is appropriate. However, for a small number of red clay or acid brown loam, alkaline compound fertilizers such as diammonium phosphate should be used.
Second, scientific selection of compound fertilizer according to crop varieties
Generally, the field crops use NPK compound fertilizer, wheat high-yield fields should use NPK ternary compound fertilizer; wheat, rice, millet and other close crops, suitable for powder compound fertilizer; thin planting crops such as corn should use granular Compound fertilizer; vegetables, especially fruit and vegetables, root vegetables and fruit trees, etc. need more cash crops, should use NPK compound fertilizer with higher potassium and low nitrogen.
Third, according to the nature of fertilizer, scientific selection of compound fertilizer
At present, a considerable portion of the marketed compound fertilizers do not meet the national GB15063-94 standard. National standards stipulate that the effective nutrient content of compound fertilizer (composite fertilizer), the total concentration of high-concentration NPK ≥40%, the low concentration of NPK ≥25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%, the water molecule content is less than 5%; the particle size is 1-4.75 mm. Therefore, in addition to looking at the trademark and nutrient content when purchasing compound fertilizer, it is also necessary to pay attention to the manufacturer and the place of origin. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Potassium chloride contains chlorine, which is not suitable for chlorine-free crops. Where there is no "S" symbol on the composite fertilizer bag, the potassium is potassium chloride, and the chlorine crops such as grapes, potatoes, tobacco, beets, etc. must not be applied. The fertilizer bag must be marked with the "S" symbol. Compound fertilizer, a compound fertilizer composed of potassium sulfate.
4. Selecting compound fertilizer scientifically according to fertilization method
In order to improve the fertilizer efficiency of the compound fertilizer, different application methods should be selected for different dosage forms of compound fertilizer. Granular compound fertilizer must be used as base fertilizer, and the higher the hardness of the pellet, the better, such as the highest hardness of the six countries, the longest fertilizer. Moreover, the compound fertilizer composed of ammonium nitrogen in the compound fertilizer is selected to improve the utilization rate of nitrogen. For topdressing application, powdered compound fertilizer should be used, and it should be noted that the water-soluble phosphorus content in the compound fertilizer should be greater than 40%, and the nitrogen compound is combined with NH4-N and NO3-N. should. Generally, the effect of humic acid compound fertilizer is better than the effect of topdressing.
First, scientific selection of compound fertilizer according to soil properties
For soils with slightly alkaline and low organic matter content (the soil pH is generally around 8.0) and effective nitrogen and phosphorus deficiency, acidic compound fertilizers such as monoammonium phosphate or humic acid NPK fertilizers and nitrogen and phosphorus should generally be used. Compound fertilizer is appropriate. However, for a small number of red clay or acid brown loam, alkaline compound fertilizers such as diammonium phosphate should be used.
Second, scientific selection of compound fertilizer according to crop varieties
Generally, the field crops use NPK compound fertilizer, wheat high-yield fields should use NPK ternary compound fertilizer; wheat, rice, millet and other close crops, suitable for powder compound fertilizer; thin planting crops such as corn should use granular Compound fertilizer; vegetables, especially fruit and vegetables, root vegetables and fruit trees, etc. need more cash crops, should use NPK compound fertilizer with higher potassium and low nitrogen.
Third, according to the nature of fertilizer, scientific selection of compound fertilizer
At present, a considerable portion of the marketed compound fertilizers do not meet the national GB15063-94 standard. National standards stipulate that the effective nutrient content of compound fertilizer (composite fertilizer), the total concentration of high-concentration NPK ≥40%, the low concentration of NPK ≥25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%, the water molecule content is less than 5%; the particle size is 1-4.75 mm. Therefore, in addition to looking at the trademark and nutrient content when purchasing compound fertilizer, it is also necessary to pay attention to the manufacturer and the place of origin. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Potassium chloride contains chlorine, which is not suitable for chlorine-free crops. Where there is no "S" symbol on the composite fertilizer bag, the potassium is potassium chloride, and the chlorine crops such as grapes, potatoes, tobacco, beets, etc. must not be applied. The fertilizer bag must be marked with the "S" symbol. Compound fertilizer, a compound fertilizer composed of potassium sulfate.
4. Selecting compound fertilizer scientifically according to fertilization method
In order to improve the fertilizer efficiency of the compound fertilizer, different application methods should be selected for different dosage forms of compound fertilizer. Granular compound fertilizer must be used as base fertilizer, and the higher the hardness of the pellet, the better, such as the highest hardness of the six countries, the longest fertilizer. Moreover, the compound fertilizer composed of ammonium nitrogen in the compound fertilizer is selected to improve the utilization rate of nitrogen. For topdressing application, powdered compound fertilizer should be used, and it should be noted that the water-soluble phosphorus content in the compound fertilizer should be greater than 40%, and the nitrogen compound is combined with NH4-N and NO3-N. should. Generally, the effect of humic acid compound fertilizer is better than the effect of topdressing.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Shear Beam Load Cells are widely used where operators need to measure compressive forces. The core component of a shear beam load cell is a spring element. This element is a piece of metal that is elastically deformed under load and recovers the moment the load is removed.
The (single-ended) shear beam is designed for low profile scale and process applications. The shear beam capacities are from 100kg to 50t. One end of the shear beam contains the mounting holes while the opposite end is where the cell is loaded. The load cell should be mounted on a flat smooth surface with high-strength hardened bolts. The larger shear beam cells have more than two mounting holes to accommodate extra bolts to keep the hardware from stretching under stress load.
Shear beams are available of nickel-plated alloy steel or stainless steel for use in harsh environments.Load Cell Central,Shear Beam Load Cells,Larger Shear Beam Cells,Load Cell Measure Compressive Forces
Zhejiang Nanhua Electronic Technology Co., Ltd , https://www.hyloadcell.com