A water-soluble fertilizer containing alginic acid and chitooligosaccharide

Abstract

The present application relates to a kind of water-soluble fertilizer containing alginic acid and chitooligosaccharide, which is composed of the following components in mass fraction: 40-50 parts of alginic acid, 10-20 parts of chitooligosaccharide, 15-25 parts of humic acid, 3-5 parts of vitamin and trace element mixture, 3-5 parts of urea, 5-8 parts of K2O and 300-500 parts of water. The fertilizer of the present application can effectively promote crop growth, enhance crop stress resistance, and maintain crop nutrient balance. The vitamin and trace element mixture is preferably a liquid extract of kelp, which not only makes full use of kelp resources, but also ensures the balanced ratio of vitamins and trace elements in the fertilizer. In addition, the addition of chitooligosaccharide in the fertilizer can induce the plant to produce immune response, inhibit the growth of pathogenic bacteria, and significantly improve the resistance of crops to fungal, bacterial and viral diseases. Further, the addition of water extract of traditional Chinese medicinal materials with insecticidal effect in the fertilizer for foliar spraying can effectively reduce the occurrence of leaf diseases and insect pests.

Description

Technical Field

[0001] This invention belongs to the field of marine material application technology, specifically relating to a water-soluble fertilizer containing alginic acid and chitosan oligosaccharides. Background Technology

[0002] As a major agricultural country, my country's agricultural output and income increase heavily rely on chemical fertilizers. However, while long-term application of chemical fertilizers can improve crop yields, it has also led to a series of problems such as soil compaction and harmful substance residues. Currently, chemical fertilizers remain the primary method of soil fertilization in my country, but due to excessive and unreasonable application, fertilizer utilization has not improved; in fact, it is declining. In contrast, while farmyard manure can alleviate soil compaction and chemical residue problems, its yield is limited and cannot meet the needs of large-scale agricultural production. Furthermore, if traditional farmyard manure is not thoroughly fermented, it can easily lead to the spread of pathogenic microorganisms and parasites (eggs), accompanied by nitrogen loss. Therefore, the development of new bio-organic fertilizers that can partially or completely replace chemical fertilizers while also possessing the soil-improving effects of farmyard manure is of significant practical importance.

[0003] Alginic acid, a natural polysaccharide extracted from brown algae, promotes crop root development, enhances stress resistance, and improves soil structure. Chitosan oligosaccharides, degradation products of chitosan, are characterized by high water solubility and bioactivity. They can induce systemic disease resistance in plants, inhibit pathogen infection, and simultaneously promote root growth and nutrient absorption. Currently, there is a lack of water-soluble fertilizer products on the market that scientifically combine alginic acid and chitosan oligosaccharides. The synergistic use of both is expected to enhance crop stress resistance, improve soil microecology, and reduce the application of chemical pesticides and fertilizers while providing nutrition, demonstrating significant application value. Summary of the Invention

[0004] The purpose of this invention is to provide a water-soluble fertilizer containing alginic acid and chitosan oligosaccharides, thereby overcoming the shortcomings of the prior art.

[0005] The water-soluble fertilizer containing alginic acid and chitosan oligosaccharide of the present invention is composed of the following components in parts by weight: 40-50 parts alginic acid, 10-20 parts chitosan oligosaccharide, 15-25 parts humic acid, 3-5 parts a mixture of vitamins and trace elements, 3-5 parts urea, 5-8 parts K2O, and 300-500 parts water.

[0006] The above-mentioned mixture of vitamins and trace elements has the following composition by mass percentage: VA 0.43 × 10⁻⁶ 4 %, VD3 0.0025%, VE 0.006%, VB2 0.0003%, VB12 15×10⁻⁷%, niacin 0.0025%, folic acid 0.55×10⁻⁷ 4 %, Biotin 0.15×10- 4 %, pantothenic acid 0.1×10-4 %, Fe 0.008%, Mn 0.006%, Cu 0.0008%, Zn0.004%, Se 0.15×10- 4 %.

[0007] The above-mentioned mixture of vitamins and trace elements can also be kelp powder, which is prepared as follows: kelp is washed with water and then ground, and the ground product is dissolved in water and filtered; wherein the mass-volume ratio of the ground product to water is 10-20% (g / ml).

[0008] In order to make the prepared water-soluble fertilizer have an insect-repellent effect, traditional Chinese medicine powder is also added to the water-soluble fertilizer of the present invention, and the added amount is 5 to 10 parts by weight.

[0009] The herbal powder mentioned above is obtained by grinding Kunming Mountain crabapple, Eupatorium fortunei and Notopterygium incisum into powder, with the mass fractions of Kunming Mountain crabapple, Eupatorium fortunei and Notopterygium incisum being 10-30, 20-50 and 30-50 respectively.

[0010] The water-soluble fertilizer of this invention contains active ingredients such as alginic acid and chitosan oligosaccharides. Using this fertilizer can effectively promote crop growth rate, enhance crop stress resistance, and maintain crop nutrient balance. The addition of chitosan oligosaccharides can induce an immune response in plants, inhibit the growth of pathogens, and improve crop resistance to fungal, bacterial, and viral diseases. Furthermore, the water extract of traditional Chinese medicinal herbs with insecticidal effects added to the fertilizer can effectively reduce foliar pests and diseases when applied as a foliar spray. Simultaneously, the vitamin and trace element mixture of this invention uses kelp powder, which not only makes full use of kelp resources but also ensures a balanced ratio of vitamins and trace elements in the fertilizer. Detailed Implementation

[0011] The liquid fertilizer of this invention contains alginic acid, chitosan oligosaccharide, humic acid, vitamins and trace elements, urea, and K2O. Any agriculturally applicable product can be used as one of the above components. The vitamin and trace element mixture can also be commercially available fertilizer-grade compound vitamins and trace elements. The preferred molecular weight of the chitosan oligosaccharide is 1000-3000 Da, with a degree of deacetylation greater than 90%.

[0012] The fertilizer of the present invention will be described in detail below with reference to specific embodiments.

[0013] Example 1: Add 400g alginic acid, 100g chitosan oligosaccharide, 150g humic acid, 30g vitamin and trace element mixture, 30g urea, and 60g K2O to 3L (3000g) of water, mix well, and then package. The mass percentage of the vitamin and trace element mixture is: VA 0.43×10⁻⁶. 4%, VD3 0.0025%, VE 0.006%, VB2 0.0003%, VB12 15×10⁻⁷%, niacin 0.0025%, folic acid 0.55×10⁻⁷ 4 %, Biotin 0.15×10- 4 %, pantothenic acid 0.1×10- 4 %, Fe 0.008%, Mn0.006%, Cu 0.0008%, Zn 0.004%, Se 0.15×10- 4 However, you can also choose any vitamin and trace element products used in the fertilizer industry.

[0014] Example 2: Add 500g alginic acid, 200g chitosan oligosaccharide, 250g humic acid, 50g vitamin and trace element mixture, 40g urea, and 50g K2O to 5L of water, mix well, and then seal.

[0015] The vitamin and trace element mixture is prepared from kelp. The specific method is as follows: Wash 2 kg of kelp with water to remove as many surface impurities as possible, cut it into small pieces, and then grind it in a grinder. If using fresh kelp, grind it into a paste, take 1 kg of the paste and add it to 10 L of water, then filter to prepare the vitamin and trace element mixture. When using it, set 1 ml to 1 g.

[0016] Example 3: The specific formula is the same as in Example 2, but 50g of Chinese herbal medicine powder is added. This Chinese herbal medicine powder is obtained by grinding 100g of Kunming Mountain crabapple, 300g of Eupatorium fortunei and 300g of Notopterygium incisum into small pieces.

[0017] This invention relates to a fertilizer applied via foliar spraying. The prepared fertilizer is diluted 800-1500 times with water before spraying. Alternatively, it can be diluted 400-600 times and applied for seed dressing, root irrigation, or drip irrigation. It is suitable for economically important plants such as flowers, fruit trees, and vegetables. Results show that spraying during the seedling, flowering, young fruit enlargement, and when plant growth is poor accelerates growth, advances maturity, improves fruit color, and significantly increases yield. Simultaneously, it significantly reduces the incidence of plant diseases.

[0018] Applying the fertilizer prepared in Example 1 to tomatoes during the seedling stage through root irrigation, twice at 15-20 day intervals, can increase yield by more than 10%, and reduce the incidence of late blight by 30% compared to the control. Applying fertilizer during the flowering or young fruit stage can increase yield by 12-18%.

[0019] The fertilizer of this invention incorporates insect-repelling traditional Chinese medicine, which can be used to repel foliar pests on plants. When the fertilizer prepared in Example 3 was diluted 500 times and used as a foliar fertilizer for cucumbers, the number of pests on the plants was significantly reduced after application. Compared with the fertilizer prepared in Example 1, the number of detectable pest-infested plants was significantly reduced, effectively suppressing the occurrence of pests and diseases. The increase in cucumber growth rate was similar to that of Example 1, and it effectively reduced the amount and frequency of pesticide use.

Claims

1. A water-soluble fertilizer containing alginic acid and chitosan oligosaccharides, comprising the following components in parts by weight: 40-50 parts alginic acid, 10-20 parts chitosan oligosaccharide, 15-25 parts humic acid, 3-5 parts vitamin and trace element mixture, 3-5 parts urea, 5-8 parts K2O, and 300-500 parts water.

2. The fertilizer as described in claim 1, characterized in that... The vitamin and trace element mixture described herein has the following composition by mass percentage: VA 0.43 × 10⁻⁶ 4 %, VD3 0.0025%, VE 0.006%, VB2 0.0003%, VB12 15×10- 7 %, niacin 0.0025%, folic acid 0.55×10- 4 %, Biotin 0.15×10- 4 %, pantothenic acid 0.1×10-- 4 %, Fe 0.008%, Mn0.006%, Cu 0.0008%, Zn 0.004%, Se 0.15×10- 4 %.

3. The fertilizer as described in claim 1, characterized in that... The vitamin and trace element mixture is a kelp pulverized liquid, which is prepared by washing kelp with water, grinding it, dissolving the ground product in water, and then filtering it; wherein the mass-volume ratio of the ground product to water is 10-20% (g / mL).

4. The fertilizer according to claim 1, characterized in that, It also contains Chinese herbal medicine powder, in quantities of 5 to 10 parts by weight.

5. The fertilizer as described in claim 4, characterized in that... The herbal powder mentioned above is obtained by grinding Kunming mountain crabapple, agastache rugosa and notopterygium incisum.

6. The fertilizer as described in claim 5, characterized in that... The mass fractions of the aforementioned *Malus kunmingensis*, *Eupatorium fortunei*, and *Notopterygium incisum* are 10–30, 20–50, and 30–50, respectively.