With the growing emphasis on the safety of agricultural products, organic fertilizers have become a favorite in agricultural production. However, some people also say that the effect of organic fertilizers is not so good. What is the truth? Recently, the reporter telephoned an interview with the senior agronomist Wan Fuping of Ningxia Hongchen Group's Agricultural Broadcasting School. He said that the organic fertilizer application effect is good, in addition to the production company's products themselves must meet the national standards, but also involves the distributors and manufacturers of the correct use of the user's guidance methods.
Reasons for poor use of organic fertilizers:
There are many reasons for this, which are divided into two major categories. The first category is the cause of fertilizers, and the second category is the use of reasons.
Category I: Causes of Fertilizer
1. Nutrients Due to the low nutrient content of the raw materials or the fermentation production process, some companies' organic fertilizers are fermented and their nutrients are not qualified. In addition, some factories do not even have laboratories, and a batch of products enter the market in this way.
2. pH value During the fermentation process, the pH changes greatly. If the fermentation process is not well controlled, there is a possibility that the pH will be above 8.5, or below 5.5. Especially over-acid products can cause crop growth to be blocked or die.
3. Chloride content Some manufacturers use ammonium chloride, a type of chlorinated fertilizer, added to organic fertilizers to increase nitrogen in total nutrients, which also leads to increased chloride levels and affect crop growth.
4. Salt content In general, the salinity of raw materials such as domestic sludge and kitchen waste is relatively high, and crops that are not salt-tolerant will have yellow leaves, fallen leaves, wilting, and death.
5. The amount of cation exchange without composting organic manure or even selling dried manure, the cation exchange capacity is extremely low, and it will not achieve the desired buffering effect. On the contrary, it will also harm the buffering effect of the soil itself and cause crop growth obstacles. .
6. Humic acid Fresh raw materials contain almost no humic acid, and humic acid is produced continuously during the fermentation process of organic fertilizers. It is particularly evident at high temperature (above 50°C). Humic acid can improve crop resistance, promote production and promote germination.
7. Small-Molecule Fatty Acids In general, small-molecule fatty acids are found in unrefined materials, such as fresh chicken manure. The harm it brings is: small-molecule fatty acids inhibit seed germination and inhibit root growth.
8. Heavy metal heavy metals accumulate in plants and eventually concentrate on people through the food chain, causing harm to people. At the same time, heavy metals can also cause damage to the growth of crops.
9. Harmful microorganisms During the organic manure production process of many manufacturers, due to the technological level, they failed to reach a certain temperature. Most locust eggs and coliform bacteria could not be killed, which affected the healthy growth of crops.
The second category: Reasons for using the method
1. As a top-dressing user The organic fertilizer is used as a fertilizer to top-dress fertilizer. It fails to cover the soil in time. The fertilizer is only on the surface of the soil and cannot be fully contacted with the soil. It does not have the effect of improving the soil. In addition to the sun and rain, beneficial microorganisms can not work, nutrients will be lost with water, organic fertilizer buffer capacity, loose soil, water permeability, thermal insulation and other functions are also not reflected. The best way to use organic fertilizers is to use inorganic fertilizers as basal fertilizers. It is best to mix them with the soil, but at least (organic fertilizers) must also be exposed on the surface of the soil, such as furrows and sulphides.
2. Direct Contact of Organic Fertilizer with Crops Some users are concerned that the fertilizer is not effective enough, or they want to be effective as soon as possible. When using the organic fertilizer, the organic fertilizer is in direct contact with the crop. This will cause the seedling to be severely dead.
3. Fresh feces The direct use of fresh feces contains a large number of pathogens and parasites that can harm fruit trees.
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