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In summary, reducing the use of chemical fertilizers and pesticides and increasing the use of organic fertilizers
In summary, reducing the use of chemical fertilizers and pesticides and increasing the use of organic fertilizers, the humic acid method can be used to further increase the organic fertilizer industry.
In recent years, the concept of green agricultural development has gradually evolved into a profound revolution in the concept of agricultural development. At the same time, it has also become the main direction of structural reform on the supply side of agriculture. With the introduction of the “zero-growth” chemical fertilizers, weight gains and efficiency, and replacement of fertilizers with organic fertilizers, it has also triggered a transitional storm of “scientific fertilizer and green development” in the field of agricultural resources. Under the green revolutionary storm, the mineral source fulvic acid was spawned. The source of fulvic acid in the end there is a magical place, the following we introduce in depth.
First, fulvic acid
Fulvic acid is a short carbon chain small molecule structural material extracted from natural humic acid. It is the water soluble part of humic acid with the smallest molecular weight and the highest active group content and is widely found in nature. Among them, soil contains the highest proportion of fulvic acid, which is mainly composed of natural, low molecular weight, yellow to dark brown, amorphous, colloidal, organic polyelectrolytes with fat and aromaticity, and cannot use a single chemical structure. Indicated.
Second, the role of ore fulvic acid:
1. Improved soil: Fulvic acid is the food of microorganisms
Affected by the action of fulvic acid, the soil pellet structure can be changed. Fulvic acid contains a large number of functional groups that interact with soil particles to form granules of various sizes in the soil and have a stable structure. Its molecular exchange capacity is between 400-600me/100g, and common soil ion exchange capacity is only between 10-20me/100g. "This means that after the soil is applied with fulvic acid, its surface activity can absorb the fertilizers exchange-complexed, and it also converts the solidified part of the soil, which can be converted into crops that can not be absorbed by crops. In order to increase nutrient utilization, this is a different place from ordinary compound fertilizers."
In addition, fulvic acid is also a food of microorganisms. In the soil where humic acid forms a granule structure, microbial activity is strong, biological activity is high, nutrient supply is adequate, and the conservation and supply of soil nutrients can be better coordinated, thereby increasing soil fertility; and after soil microorganisms multiply, it will The effective nutrients that have been solidified in the soil are released and absorbed by crops.
In addition, fulvic acid can also repair heavy metal pollution in the soil, and fulvic acid complexes heavy metals, especially hexavalent chrome into trivalent chrome, making it passivated and changing from toxic to non-toxic. Normally treated soils can be used for planting in the year, the proper amount is used to increase production efficiency, and the planted crop is more ecological.
In addition, fulvic acid can also regulate the pH of the soil and balance the pH of the soil. The ore source fulvic acid has a bidirectional effect on the regulation of the soil. When the acid is acidified, the alkali is adjusted to the alkali, which means that the soil can be adjusted to a pH suitable for the growth of the crop. Also the source of fulvic acid can eliminate soil compaction.
2. Improve fertilizer utilization, save costs, reduce pollution with fertilizers
Fulvic acid can greatly improve fertilizer efficiency. Nitrogen, phosphorus, potash fertilizers and trace element fertilizers can be used as sustained-release fertilizers for nitrogen fertilizers, activators for phosphate fertilizers, quick-acting agents for potash fertilizers, and chelating agents for trace fertilizers.
The slow-release fertilizer for nitrogen fertilizer, fulvic acid, has inhibitory effects on ureolytic enzymes and nitrite enzymes in soil. “As we all know, the compound fertilizer and compound fertilizer raw materials mainly use urea as nitrogen fertilizer, and urea is amide nitrogen. After being applied to soil, it must be converted to ammonium nitrogen or nitrate nitrogen by urease to be absorbed and utilized by crops. Fulvic acid has an inhibitory effect on urease and also has an inhibitory effect on nitase, thus increasing the utilization rate of amide nitrogen.The inhibitory effect of ore fulvic acid on the enzyme can last for about 100 days. It can inhibit the decomposition of urea, thus reducing the volatilization of urea, which proves that fulvic acid has a sustained release effect.In the middle and later stages of crop growth, as the crop absorbs fulvic acid, its inhibitory effect on urease weakens and urea is released. The amount gradually increased to meet the large demand for nitrogen during the vigorous development of crops.In addition, fulvic acid can also inhibit the activity of nitase, increase the utilization of urea, while increasing the stability of ammonia.
Phosphorus activator, and the direct cause of the increase in phosphate fertilizer efficiency of fulvic acid is: fulvic acid will form fulvic acid-metal-phosphate complexes with phosphate fertilizers, such as iron fulvic acid, aluminum fulcatter, yellow rot Phosphorus, thus forming a complex, can not only prevent the fixation of phosphorus in the soil, but also make the crop easily absorbed, thereby increasing the utilization rate of phosphate fertilizer, and the utilization rate is increased from the original 10%-20% to 28%-39%. "In the soil, the application of phosphate fertilizer is generally monoammonium phosphate and diammonium phosphate, they are easily fixed in the soil, so the utilization rate is low, after adding fulvic acid, the formation of three yuan stable structure, so that phosphorus, iron, calcium, Magnesium, aluminum, etc. form a ternary complex or chelate, thereby increasing the utilization of phosphorus.Relevant studies have shown that the combination of ore fulvic acid and phosphate fertilizer, phosphorus efficiency is 14.6% higher than the application of phosphate fertilizer alone, inhibition The fixation rate of phosphorus increased by 8.4 times.
Potash fast-acting agents, studies have shown that fulvic acid can promote the release of poorly soluble potassium, increase the release of soil available potassium, especially water-soluble potassium, but also can reduce the fixation of potassium fertilizer. When humic acid is combined with potassium ions, the part of the potassium that is solidified in the soil is released and converted from crops that cannot be absorbed and utilized by crops into crops that can be used by crops. This greatly improves potassium utilization and reduces potassium. With water loss and fixed by the soil.
Micronutrient chelating agents, micronutrients currently include series of sulfates, zinc sulfate, iron sulfate, copper sulfate, and keto acids, but this part of micro-fertilizer can easily be solidified by soil and change from soluble to insoluble. It is difficult to be absorbed and utilized by crops, thus losing the effectiveness of trace fertilizers. After a group of zinc sulphate and zinc fulcatter experiments, the zinc content in zinc sulfate was about 30%, and the zinc content in zinc fulvic acid was 5%. The zinc content in the plants was measured by the follow-up test method. The content is 30% higher than that of zinc sulfate, which indicates why fulvic acid increases the utilization of trace fertilizer and puts fulvic acid into the soil due to a large number of active groups (carboxyl, phenylhydroxyl, Methoxy) complexes with trace elements in the soil, and the part that has been solidified by the soil cannot be absorbed and utilized by the crop and can be absorbed and utilized, thereby greatly improving the utilization of trace elements. "After the experiment, it was found that ferrous acids in the ore source and chelates such as iron and zinc can undergo chelation reactions to produce fulvic acid trace element chelates with good solubility and being easily absorbed by plants, which is beneficial to the absorption of crop roots and foliage. , And can promote the operation of trace elements from the root to the ground. Among them, iron fulvic acid enters the plants from the root more than the amount of ferrous sulfate about 32%, the number of movement in the leaves is also more than the ferrous sulfate 1 At times, the chlorophyll content increased by about 15 to 45%, which effectively solved the problem of yellow leaf disease caused by iron deficiency, and its effect was similar to that of organic iron fertilizer used abroad, but the price was much lower.
The source of fulvic acid reduces the input of fertilizer, saves a lot of fertilizer costs and labor costs, and also solves the problems of soil pollution caused by excessive fertilization.
3. Strengthen crop resistance: ability to resist drought, resist cold and disease, increase crop yield, and improve crop quality
(1) To increase resistance, the ore source fulvic acid can reduce the stomatal opening intensity of the leaves of plants and reduce the transpiration of leaves, thus reducing the water consumption, improving the water condition of the plants, ensuring the normal growth and development of the crop under drought conditions, and enhancing drought resistance. Sex. Humic acid is mostly amphoteric colloid, which has large surface activity and inhibits fungi. It can enhance the coldness of crops, be easily adsorbed by cell membranes, change cell membrane permeability, promote the absorption of inorganic nutrients, prevent rot, root rot, and reduce pests and diseases. .
(2) It is to promote crop breathing. When fulvic acid and humic acid are applied, the root system can be developed and secondary roots can be increased on the crop. China Academy of Agricultural Sciences uses ammonium sulfate and ammonium humate as comparative tests. The data shows that ammonium humate can increase the respiratory intensity of rice by 18.2%, and light and intensity increase by 12.2%.