Why is there such a big difference in price and effect for compound fertilizers with the same content?
Why do you and others apply compound fertilizers to the crops in the field, even the standard nutrient content on the outer packaging bag is the same, but why are the effects of the two applied to field crops so different?
There are many types of compound fertilizers on the market, and the mainstream varieties include chlorine-based, sulfur-based, nitro-based, and urea-based. So, what are the characteristics, advantages and disadvantages of these kinds of compound fertilizers, and what are the differences between them? How should farmer friends purchase flexibly according to their own land conditions and differences in crop types when choosing? When purchasing fertilizers, why should we not only compare the nutrient content and price of compound fertilizers, but also carefully compare the raw materials used in production?
Today, I will talk about this issue specifically, so as to help everyone better understand compound fertilizers and buy and use compound fertilizers more correctly.
First of all, let me explain that compound fertilizers such as chlorine-based, sulfur-based, urea-based, and nitro-based, the “base” here simply means the source of raw materials used in the production of compound fertilizers. Let’s look down for details!
1. About chlorine-based compound fertilizer
1. What is chlorine-based compound fertilizer? What fertilizer properties does it have?
The so-called chlorine-based compound fertilizer is simply a compound fertilizer containing more chlorine. It is a compound fertilizer produced using chlorine-containing raw materials. It mainly refers to the fact that the nitrogen element in chlorine-based compound fertilizers is mainly made of ammonium chloride, or the potassium element is mainly made of potassium chloride.
Everyone needs to pay attention, there are two kinds of chlorine-based compound fertilizers commonly seen on the market, one is single-chlorine compound fertilizer, which means that the potassium element in the fertilizer is provided by potassium chloride raw materials; the other is double-chlorine compound fertilizer Fertilizer means that the potassium element in the fertilizer is provided by the potassium chloride raw material, and the nitrogen element is provided by the ammonium chloride.
In addition, my country’s fertilizer registration standards require that chlorine-containing compound fertilizers must clearly indicate the chlorine content in the fertilizer on the outer packaging bag, generally marked with high chlorine, medium chlorine, and low chlorine. High-chlorine compound fertilizers refer to fertilizers with a chlorine content higher than 30%, medium-chlorine compound fertilizers refer to fertilizers with a chlorine content between 15% and 30%, and low-chlorine compound fertilizers refer to fertilizers with chlorine Compound fertilizer with a content of 3-15%.
Note: Fertilizers with a chlorine content of less than 3% are generally called chlorine-free compound fertilizers, which do not need to be marked on the outer packaging of the fertilizers.
2. Advantages and disadvantages
①Advantages: The biggest advantage is that the market price is very low, and the higher the chlorine content in the chlorine-based compound fertilizer, the cheaper the fertilizer price will be. It is very suitable for use on rice and other paddy field crops, and it is also very suitable for use on chlorine-loving or chlorine-resistant crops such as sorghum, millet, cotton, hemp, and spinach, and it is also more suitable for neutral chlorine-resistant crops such as corn and wheat. The use of field crops, especially on fiber crops such as cotton and hemp, can greatly improve the overall quality.
② Disadvantages: The biggest disadvantage is that more chlorine will affect the soil condition and crop quality, and it is also easy to cause crop burning or seedling burning. First, it is not suitable for long-term use on the same land, otherwise it will cause soil compaction, acidification, saline-alkali and other problems that affect crop growth, especially not suitable for using chlorine-based compound fertilizers on saline-alkali land. Second, try to avoid using it on chlorine-sensitive crops such as potatoes, watermelons, grapes, sweet potatoes, sugar beets, sugarcane, cabbage, tea, tobacco, otherwise the quality, appearance and grade will be greatly reduced. Third, because chlorine-based compound fertilizers contain a large amount of chloride ions, they are toxic to the seeds and roots of crops, and a large amount of them can easily cause crops to burn seeds or seedlings.
In addition, when we farmers use chlorine-based compound fertilizer, it is recommended to use it on neutral soil plots as base fertilizer and top dressing, but it is not recommended to be used as seed fertilizer and seedling fertilizer. and. When using chlorine-based compound fertilizer, it is best to mix it with organic fertilizer.
2. About sulfur-based compound fertilizer and disulfide-based compound fertilizer
1. What is sulfur-based/disulfide-based compound fertilizer?
The so-called sulfur-based compound fertilizer is simply a compound fertilizer produced using potassium sulfate as a raw material. That is, the potassium nutrient in the sulfur-based compound fertilizer is mainly provided by the potassium sulfate raw material. As for the disulfide-based compound fertilizer, simply speaking, potassium nutrition is provided by potassium sulfate raw material, while nitrogen nutrition is provided by ammonium sulfate raw material.
2. Features and advantages and disadvantages
Sulfur-based/disulfide-based compound fertilizers are fertilizers with a chlorine content of less than 3%, which can increase yield, improve quality and flavor, and improve appearance grades, and are suitable for use on most soils and most crops. It is especially suitable for use in crops such as fruit trees and vegetables, and can also be used as base fertilizer, topdressing fertilizer, and seed fertilizer. Using disulfide-based compound fertilizers on some sulfur-loving crops such as soybeans, leeks, garlic, and onions will achieve better fertilization effects than using sulfur-based compound fertilizers.
Disadvantages: The sulfur-based compound fertilizer has a high nutrient concentration, so when using the fertilizer, avoid direct contact with the seeds or large roots, otherwise it will affect the emergence rate, and in severe cases may cause burning of seedlings and root damage.
3. About Nitro Compound Fertilizer/Nitrosulfur Compound Fertilizer
1. What is nitro compound fertilizer?
The so-called nitro compound fertilizer is a general term, which is a compound fertilizer (nitrate nitrogen or potassium nitrate) containing nitrate ions. It is specifically divided into two types: nitro compound fertilizer and nitrosulfur compound fertilizer. The first type of nitro compound fertilizer is generally a compound fertilizer that uses ammonium nitrate as a raw material to provide nitrogen nutrients, and the second type of nitrosulfur-based compound fertilizer generally uses ammonium nitrate as a raw material to provide nitrogen nutrients and potassium sulfate to provide potassium nutrients. compound fertilizer.
2. Features and advantages and disadvantages
Nitro compound fertilizer is a chlorine-free compound fertilizer (chlorine content is less than 3%), so it can be widely used on various soils and various crops. The nitrate nitrogen in nitro compound fertilizer can be directly absorbed and utilized by crops, so it is one of the compound fertilizers with the fastest dissolution, fastest effect and highest absorption rate among all kinds of compound fertilizers.
But everyone needs to pay attention to: Compared with other kinds of compound fertilizers, nitro compound fertilizers have better fertilizer efficiency, but the price is much higher than other compound fertilizers. Sulfur-deficient (nitro-sulfur-based compound fertilizer) crops are also more suitable for use on saline-alkali soil, and there is basically no soil pollution problem after using nitro-based compound fertilizer. It can be used as base fertilizer or top dressing.
In addition, because the nitrogen in the nitro compound fertilizer is a nitrogen fertilizer nutrient that is easy to dissolve in water and is easy to be washed away by water, and the mobility of the nitrate salt nutrient is relatively good, and it is not easy to be absorbed and retained by the soil, so the nitro compound fertilizer It is not suitable for use in paddy fields, otherwise it will cause a large loss of nutrients in the nitro compound fertilizer, and the use of fertilization will be greatly reduced.
4. About urea-based compound fertilizer
1. What is urea-based compound fertilizer?
The so-called urea-based compound fertilizer is simply a compound fertilizer produced by using urea as a raw material to provide nitrogen nutrients. Urea is the nitrogen fertilizer with the highest nitrogen content, so generally urea-based compound fertilizers are high-nitrogen compound fertilizers with a nitrogen content of more than 20%.
2. What are the fertilizer characteristics and advantages and disadvantages of urea-based compound fertilizer?
First of all, the nitrogen in urea-based compound fertilizer belongs to amide nitrogen (organic nitrogen), and amide nitrogen needs to be decomposed and converted into ammonium carbonate, then ammonium bicarbonate and hydrogen after being applied to the soil through the action of urease. Ammonium oxide can only be absorbed and utilized by crops. Therefore, when using urea-based compound fertilizer, we must pay attention to applying it to the soil before the peak period of crop fertilizer demand, especially in areas with relatively low temperature (such as Northwest China) or seasons with relatively low temperature (such as winter and early spring). When using urea-based compound fertilizer, more attention should be paid to early fertilization to prevent missing the peak period of crop fertilizer demand.
Secondly, ammonium carbonate, ammonium bicarbonate, and ammonium hydroxide, which are decomposed from urea in urea-based compound fertilizers, are easy to emit and lose in the form of ammonia gas and reduce fertilizer efficiency. In the future, only about 20%-30% of the nitrogen nutrients in the fertilizer can be absorbed and retained by the soil, and the other 70-80% of the nitrogen nutrients will be volatilized and lost in vain. Therefore, when using urea-based compound fertilizers, we must not only pay attention to early application to promote decomposition and transformation, but also pay attention to deep burial and deep application in farmland.
Again, urea-based compound fertilizers will produce some biurets during the decomposition process after being applied to the soil, and biurets can easily cause crops to burn seeds, roots or seedlings. Therefore, everyone must pay attention to the hazards of biuret crops when using it. It is recommended that you do not use urea-based compound fertilizer as seed fertilizer, try to avoid using it in the seedling stage of crops, and do not use excessive fertilizer at the base of crops at one time, so as to prevent the biuret in urea-based compound fertilizer from burning the crops , burnt roots or burnt seedlings. In addition, urea-based compound fertilizers are not suitable for use on crops such as peanuts, soybeans, and mung beans.
Finally, two more points are added: one is that urea-based compound fertilizer is a high-nitrogen fertilizer that uses urea raw material as the source of nitrogen nutrition, and care should be taken to prevent moisture absorption and agglomeration during storage; the other is that urea-based compound fertilizer is neutral Fertilizers can generally be used on most soils and crops, but urea-based compound fertilizers are not suitable for use on alkaline soils, otherwise the nitrogen nutrient in the fertilizer will be volatilized and lost in the form of ammonia gas.
I have introduced so much to you. I believe that everyone has a certain understanding of various common compound fertilizers on the market. When purchasing and using compound fertilizers in the future, you must pay attention to flexible selection and correct use.