How to choose chemical fertilizer
The largest amount of plant needs is nitrogen, phosphorus and potassium. Nitrogen is the main nutrient element of crops. It is one of the components of proteins, nucleic acids and enzymes. It participates in the metabolism of plants, and its content directly affects the growth and development, yield and quality of crops. Phosphorus is an essential element for composing nucleic acids and various phosphate esters. Phosphorus plays a physiological regulating role in plants. The lack of phosphorus in crops often presents various symptoms such as smaller leaf shape, darker color, and thicker leaves. Potassium is an indispensable nutrient element for the growth and development of crops. It can promote a variety of metabolic reactions of crops and participate in various metabolic activities. Therefore, potassium deficiency will affect the growth and development of plants, thus affecting the yield and quality of crops.
According to whether the fertilizer contains three effective elements of nitrogen, phosphorus, and potassium, the fertilizer can be roughly divided into one-element fertilizer, binary fertilizer, and three-element fertilizer. One-element fertilizer is a single-element fertilizer containing only one active ingredient, and binary fertilizer is a fertilizer containing two active ingredients, and so on. In addition to nitrogen, phosphorus, potassium in addition to other trace elements in the fertilizer called multi-element fertilizer. Trace elements have a certain effect on the growth of crops, but they do not play a decisive role.
The price of fertilizers is determined by the content of three active ingredients: nitrogen, phosphorus and potassium. Trace elements also have no decisive effect on the price of fertilizers. At present, most of the trace elements in the multi-element fertilizer packaging label on the market have not been added or added in a very small amount. This will not achieve a real effect. It is only a promotional tool and should not be taken.
What to choose fertilizer
When purchasing chemical fertilizers, pay attention to the following points:
Look at the product identification. Each fertilizer bag should be marked with the product name, brand name, active ingredient content, net weight, standard number, production license number, manufacturer name, and site. No factory name, active ingredient, or product that implements the standard number can be purchased. Consumers must not be greedy and lose money.
Second, look at the test report. Whether it is imported fertilizer or domestic fertilizer should check the inspection report of fertilizer. The inspection report is preferably issued by the local quality and technical supervision department. The general inspection report includes the contents of nitrogen, phosphorus and potassium, total nutrient content, and grain size and moisture content of the chemical fertilizer. Total nutrients are the decisive factor for the price of fertilizers. It is better to have uniform particles and low water content. Then compare it with the label on the outer package, pay attention to the deviation of the nutrient between the test result and the label. The smaller the deviation, the better.
Three to see if chlorine is contained in chemical fertilizers. The new standard is classified according to the mass fraction of chloride ions, namely, products that do not contain “chlorine-containing†products, products that contain chlorine (low-chlorine), products that contain chlorine (chlorine-containing), and products that contain chlorine (high chlorine There are four types of products in the product, chlorine is too high, and it has adverse effects on some crops. For example, the application of chlorine-containing fertilizers to crops such as vegetables, oranges, and sweet potatoes will affect the quality of the crops, and reduce the yield and income.
The fourth is to select some well-resourced chemical fertilizer distributors to purchase chemical fertilizers. When buying, try to select some well-known brands or chemical fertilizers that have been used and have good effects.
Three principles of fertilization
The scientific application of fertilizers should grasp three basic principles:
The first is based on organic fertilizer and supplemented by fertilizer. Pay attention to the application of high-quality organic fertilizers, rational application of chemical fertilizers, the ratio of organic nitrogen to inorganic nitrogen is not less than 1:1, combined with land use.
The second is the principle of balanced fertilization. Based on the results of soil nutrient determination and crop manure requirements, the fertilizer application amount was determined according to the requirement of balanced fertilization. Although there are corresponding standards in each place, it will not exceed the following principle: The maximum inorganic nitrogen nutrient application limit is 225 kg/ha, while the inorganic phosphate fertilizer and potash fertilizer application rate will be determined according to the soil fertility status, so as to maintain the soil nutrient balance as quasi.
The third is the principle of nutritional diagnostic top dressing. According to the nutritional characteristics of crop growth and development and soil and plant nutrient diagnosis, topdressing can be performed to meet the needs of crops for nutrients.
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