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Water soluble fertilizer knowledge

Source of information: Time: 2020-02-21 02:25:05

Millennium Tongzhou vitality north stream

Compared with traditional superphosphate, granulated compound fertilizer and other varieties, water-soluble fertilizers have obvious advantages. It is a fast-acting fertilizer with good water solubility and no residue. It can be completely dissolved in water and can be directly absorbed and used by crop roots and leaves. However, water-soluble fertilizers are used with great care.
Water-soluble fertilizers are used in combination with micro-sprinkler irrigation and drip irrigation in facility agriculture. Water-band fertilizers are used to achieve water-fertilizer integration and achieve the efficiency of water, fertilizer, and labor. With the increasing shortage of water resources, the application of water-soluble fertilizers has become one of the measures to increase agricultural efficiency and increase farmers' income. The core technical points of water-soluble fertilizer application are described as follows:
1. Avoid direct flushing: take a second dilution of water-soluble fertilizers that have higher nutrient content than normal compound fertilizers, and the amount is relatively small. Direct flushing can easily cause burned seedlings to hurt roots and weak seedlings. Second dilution is not only good for fertilizer application. Uniformity can also improve fertilizer utilization.
2. Small and multiple applications: Due to the fast-acting nature of water-soluble fertilizers, it is difficult to persist in the soil for a long time. Small and multiple applications are the most important fertilization principles, which are consistent with the characteristics of plant roots' continuous absorption of nutrients, reducing leaching caused by large-scale fertilization at one time. loss. Generally, the dosage is 3-6 kg per mu.
3. Pay attention to nutrient balance: Water-soluble fertilizers are usually poured, sprayed, or mixed into water, and applied with irrigation (drip irrigation, spray irrigation). It should be reminded that when drip irrigation is used for fertilization, due to the dense root growth and large amount of crop roots, the dependence on nutrient supply to the soil is reduced, and it is more dependent on the nutrients provided by drip irrigation. If the water-soluble fertilizer formula is not balanced, it will affect crop growth. In addition, water-soluble fertilizers must not be applied with traditional irrigation methods such as flood irrigation or running water irrigation to avoid waste of fertilizer and uneven application.
4. Combined application: Water-soluble fertilizer is a fast-acting fertilizer, which can only be used as a topdressing fertilizer. Especially in conventional agricultural production, water-soluble fertilizers cannot replace other conventional fertilizers. It is necessary to combine base fertilizer with topdressing fertilizer, organic fertilizer with inorganic fertilizer, and water-soluble fertilizer with conventional fertilizer in order to reduce costs and give full play to the advantages of various fertilizers.
5. Try to use it alone or mixed with non-alkaline pesticides: When vegetables are deficient or root growth is poor, many farmers use spraying water to dissolve fertilizers to alleviate them. It is reminded that water-soluble fertilizers should be applied as far as possible alone or mixed with non-alkaline pesticides, so as to prevent metal ions from reacting to cause precipitation and causing leaf fats or pesticide damage.
6. Avoid excessive irrigation: When fertilizing is the main purpose of irrigation, the root layer can be moistened. The depth of the root layer of different crops is very different. You can dig the soil at any time with a shovel to know the specific depth of the root layer. Excessive irrigation not only wastes water, but also causes nutrients to leak below the root layer, which cannot be absorbed by the crop and wastes fertilizer. In particular, urea and nitrate nitrogen in water-soluble fertilizers (such as potassium nitrate, calcium ammonium nitrate, nitrophosphate, and water-soluble fertilizers containing nitrate nitrogen) are easily lost with water.
7. Prevent surface salt accumulation: Long-term use of drip irrigation and fertilization in greenhouses or greenhouses will cause surface salt accumulation and affect root growth. Subsurface drip irrigation can be used to inhibit salt migration to the surface.
How to distinguish between true and fake water-soluble fertilizers?
Water-soluble fertilizer is a kind of multi-component compound fertilizer that can be completely dissolved in water, which can be quickly dissolved in water. The absorption and utilization rate of crops is 2 ~ 3 times that of ordinary chemical fertilizers. It is improving fertilizer utilization rate, saving agricultural water, reducing ecological environment pollution, and improving Crop quality and reduced labor play an important role. At present, the general consumption areas are mainly concentrated in greenhouse vegetable production bases, fruit tree production bases, and some flowering areas.
Due to the simple production equipment and technology of water-soluble fertilizers, there are many small-scale production enterprises, and some enterprises do not have product inspection capabilities, backward production processes, and weak quality awareness, resulting in uneven quality of water-soluble fertilizers on the market. , Need to pay attention to the following points:
Look at the nutrient content of each element on the packaging bag
According to the standards for water-soluble fertilizers for a large number of elements, the single nutrient content of the three elements of nitrogen, phosphorus and potassium cannot be less than 4%, and the sum of the three must not be less than 50%. , Or the total of the three elements of nitrogen, phosphorus, potassium is less than 50%, indicating that such products are unqualified.
Large element + trace element type
The content of trace elements refers to the sum of the contents of copper, iron, manganese, zinc, boron, and molybdenum. The product should contain at least one trace element. The total content of trace elements cannot be less than 0.2%, and a single trace element with a content of not less than 0.05% should be included in the trace element content, and the content of molybdenum element should not be higher than 0.5%.
Large element + medium element type
The content of medium element refers to the sum of the content of calcium and magnesium. The product should contain at least one medium element. The total content of medium element must not be less than 1.0%, and a single medium element with a content of not less than 0.1% should be counted. Amount of element content. Look at the labeling of various specific nutrients on the packaging bag. The high-quality large-element water-soluble fertilizers have a clear labeling of the guaranteed ingredients (including large amounts of elements, medium elements, and trace elements), and they are all labeled in a single way. rest assured. The nutrient content of informal manufacturers generally appears as the sum of the content of nitrogen, phosphorus, and potassium ≥ a few percent. If so, the product is irregular.
Look at product recipes and register crops
A large amount of water-soluble fertilizer is a formula fertilizer. High-quality water-soluble fertilizers generally have several formulas. Suitable formulas can be found from the seedling stage to the harvesting stage. If the package clearly says that it is a special fertilizer for a certain crop, With 1-2 formulas, this kind of approach is not very reliable. Regular fertilizer registered crops are one or more crops. For unregistered crops, local experience in use is required.
See if there are product implementation standards
What needs to be explained here is that we usually talk about fully water-soluble flushing and drip irrigation fertilizers. In fact, the general name of its product is a large number of elemental water-soluble fertilizers. The general implementation standard is NY1107-2010. It shows that it is not a large amount of element water-soluble fertilizer.
The standards marked on the packaging of many large-element water-soluble fertilizers begin with GB, indicating that such products are unqualified. In addition, it also depends on whether it has a fertilizer registration certificate number. If the vegetable farmer has doubts about the product, he can check his fertilizer registration certificate number online. A qualified large number of elemental water-soluble fertilizers can be found on the fertilizer registration certificate number and the manufacturer. If not found, it means that the product is unqualified.
Look at the inspection report or the certificate of conformity. For all water-soluble fertilizers produced by regular manufacturers, the inspection report or certificate of conformity should be placed in the packaging box to clearly inform consumers of the product quality inspection results of this batch of fertilizer.
See if the content of heavy metals is marked
The heavy metal content and water-insoluble matter of a large number of elemental water-soluble fertilizers produced by regular manufacturers are lower than national standards, and there are obvious labels. If the fertilizer packaging bag is not marked with heavy metal content and water insoluble matter, use it with caution.
Dissolve a little fertilizer with an appropriate amount of water
High-quality large-element water-soluble fertilizers can dissolve quickly in water, the solution is clear, and there are no residues and sediments. If the fertilizer cannot be completely dissolved in water and there are residues, it indicates that the quality of the fertilizer is not very good.
Look at the particles of fertilizer
Good-quality water-soluble fertilizer products have uniform particles and are crystalline (the particle size is similar to that of salt particles). If the size of the water-soluble fertilizer is different, the large particles are similar to the size of compound fertilizer or urea, so it is best not to buy.
How to identify the authenticity of imported water-soluble fertilizers?
1. Smell, let's not talk about it, everyone knows it;
2. The appearance must be dyed (red, blue, green), because foreign fertilizers are designed for large farms. If it is colorless, adding it to the farmer does not know that it may be added more than once to cause excessive concentration;
3. There are black dots, green dots, etc. Those are trace elements and their distribution is relatively uniform (this is generally not possible in China), mainly due to equipment problems (horizontal and barrel mixing opportunities are about 10%) Dead angle, resulting in uneven mixing. Double spiral cone mixers are used abroad, and require 30 minutes of mixing);
4. Low water content, an open secret. In order to reduce costs in China, powdered urea (some are directly pulverized with granules) will be used. This is hygroscopic and the lowest. When urea reaches 30%, use You can find that it is very sticky by pinching, and it will stain on the hand when you take it off. The imported ones will not stain on the hand;
5, the use of effects, always use, you will find that good imported water-soluble fertilizer will be harvested for a period of time, just like people's living conditions will be longevity. Water-soluble fertilizers added with hormones will appear premature aging and get more sick, just like people who take drugs.
6. Price changes. In fact, the price is very high in many cases, but like imported pesticides, most of the money is spent on research and development. Water-soluble fertilizers are used for testing. For example, an imported water-soluble fertilizer that I was in contact with. In a test base around Wuhan, they rented 30 acres of land and spent a year to prove that the product is suitable for crops in the region. The first two years will be more expensive. From the third year, the price will not be expensive because the cost is recovered. They think that the product is already an old product and should not be too expensive.
Therefore, imported products start to be expensive and should not be expensive after three years. As far as I was concerned, at the beginning it was 15 pounds for retail, and then 12 pounds for new products. Some regions even launched promotions as low as 10 yuan per pound.
7. The product has characteristics, either it is a combination of phosphate and calcium, or it has a certain slow-release effect, or it is added with promoting ingredients, etc., but the domestic hype is high in content (high for fart, can not be absorbed), good hormones (No matter how good drugs are drugs, what kind of lipids are more expensive than the compound nitrate sodium, the effect is hidden.), Improve the soil, etc. (more mysterious, can also release the soil's fixed substances, you dare to make some precipitation to become ions State?)
Common points of imported water-soluble fertilizers and domestic water-soluble fertilizers:
1. Imported water-soluble fertilizers are basically the same as domestic water-soluble fertilizers. And all are fast-acting, water-soluble fertilizers, which can improve the crop's disease resistance, cold resistance, drought resistance, lodging resistance, and extend the fresh-keeping period and storage period of crops.
2. After use, the color of the fruits is even and bright, and the size is symmetrical, which can promote the early maturity of the crops and market in advance.
3. The methods of use are dilution, direct spraying on the page, flushing, drip irrigation, etc.
Differences between imported water-soluble fertilizers and domestic water-soluble fertilizers:
1. The price is different, the imported is more expensive than the domestic one, because the imported water-soluble fertilizer needs to increase the other costs, such as tariffs, so the sales price is more expensive. However, domestic water-soluble fertilizers do not have the various costs incurred by tariffs and compound intermediate links, so it is cheaper than imported water-soluble fertilizers of the same content.
2. In the market, when China ’s water-soluble fertilizers have not yet developed, imported water-soluble fertilizers have indeed occupied the high-end market of water-soluble fertilizers in our country. Breakthroughs and the gradual import of water-soluble fertilizers will gradually be driven out of the market in China.

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