Biochar-based nutrition controlled release bar

Abstract

The utility model belongs to the field of slow-release fertilizer production devices, and relates to a biochar-based nutrition controlled-release rod which comprises a composite carbon rod main body, the composite carbon rod main body comprises a biochar layer and a carbon fiber layer, the outer side of the biochar layer is wrapped with the carbon fiber layer, and the outer wall of the carbon fiber layer is wrapped with a filter layer. The nutrient controlled-release rod provided by the utility model is simple in structure, easy to produce and capable of continuously and stably releasing, reducing nutrient loss and promoting growth and development of crops; meanwhile, the size and raw materials of the nutrition controlled-release rod can be flexibly applied according to actual conditions, the application scene is wide, and operability is high.

Description

Technical Field

[0001] The utility model relates to the field of slow-release fertilizer production devices, in particular to a biochar-based nutrient controlled-release rod. Background Art

[0002] Agricultural non-point source pollution caused by excessive fertilizer use, and the resulting problems of soil acidification and compaction, groundwater contamination, and eutrophication, pose a serious threat to the safety of agricultural ecosystems and human health. Soil testing and formula fertilization, or more advanced precision fertilization based on real-time soil-plant monitoring, which delivers targeted, controlled release of specific nutrients based on crop growth and development needs, is one of the effective measures to mitigate agricultural non-point source pollution at its source.

[0003] Currently, there are three main known technologies for controlled-release fertilizers: chemical fertilizers, organic fertilizers, and microbial fertilizers. However, most fertilizers are water-soluble. For example, chemical fertilizers are mostly powdered, easily soluble in water, and have small particle sizes. Therefore, they are often fast-acting fertilizers and can cause soil acidification or salinization. Therefore, there is an urgent need for a biochar-based controlled-release nutrient rod. Utility Model Content

[0004] To develop a porous carbon rod capable of sustained and stable nutrient release, reducing nutrient loss and promoting crop growth and development, this utility model provides a biochar-based nutrient controlled-release rod. This rod ensures that plants receive a continuous and appropriate supply of nutrients throughout their growth cycle, achieving high-value utilization of nutrients and promoting crop growth and development.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A biochar-based nutrient controlled-release rod comprises a composite carbon rod body, wherein the composite carbon rod body comprises a biochar layer and a carbon fiber layer, the outer side of the biochar layer is wrapped with a carbon fiber layer, and the outer wall of the carbon fiber layer is wrapped with a filter layer.

[0007] Furthermore, the biochar layer and the carbon fiber layer are fixedly bonded by hot melt adhesive, and the carbon fiber layer and the filter layer are fixedly bonded by hot melt adhesive.

[0008] Furthermore, the hot melt adhesive is EVA hot melt adhesive.

[0009] Furthermore, the biochar layer is a composite layer of any one or more of a straw biochar layer, a forest waste biochar layer and a fruit shell biochar layer.

[0010] Furthermore, the diameter of the biochar layer is 3 mm to 9 mm.

[0011] Furthermore, the thickness of the carbon fiber layer is 1 mm to 2 mm.

[0012] Furthermore, the composite carbon rod body has a diameter of 5 mm to 10 mm and a length of 60 mm to 70 mm.

[0013] Furthermore, the filter layer is a filter cloth with a thickness of 0.25 mm to 0.55 mm.

[0014] Furthermore, the specification of the filter layer is 150mm×150mm~200mm×200mm.

[0015] Furthermore, the filter layer is a fine-pored nylon cloth, and the pore size of the fine-pored nylon cloth is 20 meshes to 100 meshes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The nutrient controlled-release rod provided by the present invention has a simple structure and is cylindrical in shape. In agricultural production, the diameter and length of the rod can be changed according to different crop types and characteristics. It can also be made into a single carbon rod or a set of multiple carbon rods, which is highly maneuverable. The nutrient controlled-release rod has a three-layer composite structure, each layer performs different functions, the outer layer is a filter layer, which can prevent the carbon rod from directly contacting the outside world and reduce losses. The middle biochar layer uses bio-based materials, and its rich pores can effectively adsorb and store the nutrients required for crop growth and development. After entering the soil, it can achieve long-term slow release, effectively improving fertilizer utilization efficiency. The internal carbon fiber layer can significantly improve the overall structural strength and stability of the slow-release rod. Therefore, the nutrient controlled-release rod provided by the present invention can ensure that plants obtain a continuous and stable supply of nutrients during the growth cycle, realize high-value utilization of nutrients, and promote the growth and development of crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a diagram of a biochar-based nutrient controlled-release rod of the utility model.

[0020] Figure 2 This is a schematic structural diagram of a biochar-based nutrient controlled-release rod of the utility model.

[0021] Figure 3 This is a cross-sectional view of a biochar-based nutrient controlled-release rod of the utility model.

[0022] Explanation of the accompanying symbols: 1. Filter layer; 2. Carbon fiber layer; 3. Biochar layer; 4. Composite carbon rod body. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Since most fertilizers currently available are quick-acting fertilizers, their action time is limited and they cannot provide long-term and stable nutrient supply to plants, the utility model provides a nutrient porous carbon rod that continuously and stably releases nutrients and can promote crop growth and development.

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] The utility model provides a nutrient slow-release rod, comprising a composite carbon rod body 4, wherein the composite carbon rod body 4 comprises a biochar layer 3 and a carbon fiber layer 2, wherein the outer side of the biochar layer 3 is wrapped with the carbon fiber layer 2, and the outer wall of the carbon fiber layer 2 is covered with a filter layer 1.

[0027] When in use, the nutrient controlled-release rod is placed in the nutrient solution. The nutrient solution is adsorbed in the composite carbon rod 4 through the filter layer 1, carbon fiber layer 2 and biochar layer 3. After adsorption is completed, it is inserted into the soil. The porous carbon rod can slowly release nutrients, thereby achieving long-term slow release.

[0028] The nutritional sustained-release rod described in this embodiment includes a filter layer 1, which is a fine-pore nylon cloth with a specific pore size of preferably 20 mesh to 100 mesh, more preferably 30 mesh to 80 mesh; the thickness of the filter layer 1 is 0.25 to 0.55 mm, more preferably 0.35 mm to 0.45 mm; the filter layer 1 serves as a leak-proof coating, which can prevent the carbon rod from direct contact with the outside world and reduce loss.

[0029] The specifications of the filter layer 1 are 150mm×150mm~200mm×200mm, more preferably 170mm×170mm~190mm×190mm; the filter layer 1 has various specifications, and nutritional sustained-release rods of corresponding specifications can be prepared based on actual conditions, which has strong practical applications.

[0030] The biochar layer 3 and the carbon fiber layer 2 are fixedly bonded by hot melt adhesive, and the carbon fiber layer 2 and the filter layer 1 are fixedly bonded by hot melt adhesive; the hot melt adhesive is an EVA hot melt adhesive; EVA hot melt adhesive does not contain solvents or harmful volatiles, does not generate pollution during use, and is both environmentally friendly and safe; EVA hot melt adhesive only needs to be heated and melted when used, and the operation is simple, fast and efficient; EVA hot melt adhesive has good weather resistance, can resist the erosion of environmental factors such as ultraviolet rays and moisture, maintains stable bonding properties, and has a wide range of applications.

[0031] The present invention has no special limitation on the source of the hot melt adhesive material, and commercially available products known to those skilled in the art can be used.

[0032] In this embodiment, the carbon fiber layer 2 is wrapped around the outside of the biochar layer 3, including the cross sections at both ends; the thickness of the carbon fiber layer 2 is preferably 1 mm to 2 mm, more preferably 1.2 mm to 1.7 mm.

[0033] The material of the carbon fiber layer 2 is preferably acrylic fiber and viscose fiber. The utility model has no special limitation on the source of the material of the carbon fiber layer 2, and commercial products well known to those skilled in the art can be used.

[0034] This embodiment also includes a biochar layer 3 of a composite carbon rod body 4; the biochar layer 3 of the composite carbon rod body 4 serves as a fertilizer slow-release matrix. By utilizing its abundant pores and huge specific surface area, it can absorb and store a large amount of nutrient elements required for crop growth and development, and can achieve long-term slow release after entering the soil, thereby effectively improving fertilizer utilization efficiency.

[0035] The raw material for the biochar layer 3 preferably includes at least one of straw biochar, forest waste biochar, and fruit shell biochar. The diameter of the biochar layer 3 is preferably 3 mm to 9 mm, more preferably 4 mm to 8 mm. The present invention does not specifically limit the source of the raw material for the biochar layer 3; commercially available products known to those skilled in the art can be used.

[0036] In this embodiment, the raw materials of the biochar layer 3 are further added with desulfurized gypsum powder; the mass ratio of the biochar powder to the desulfurized gypsum powder is preferably 4 to 5:1.

[0037] Desulfurized gypsum powder is primarily used as a soil conditioner, effectively replacing adsorbed salt ions with calcium ions. This improves soil structure, increases soil air permeability and water retention, and promotes crop growth. Furthermore, desulfurized gypsum powder can regulate soil pH, which is beneficial to the development of plant roots. In some cases, desulfurized gypsum powder is also used to treat soil pollution because it reacts with harmful substances in the soil, reducing their activity and toxicity. The utility model does not specifically limit the source of the desulfurized gypsum powder; commercially available products familiar to those skilled in the art may be used.

[0038] The biochar rods are made by mixing the raw materials in the aforementioned mass ratios and adding an appropriate amount of water to form a uniform mixture. The mixture is then poured into a mold, compression-molded, and dried. The dried blank is then subjected to a high-temperature heat treatment, typically under an inert atmosphere, to carbonize the organic matter and form a carbon material. The carbonized porous carbon rods are then surface treated, such as by acid washing or activation, to increase their surface activity and chemical stability. This results in a biochar rod.

[0039] The nutrient controlled-release rod provided by the utility model can be applied to various planting occasions. The diameter and length of the rod body can be changed according to different crop types and characteristics. It can also be made into a single carbon rod or a set of multiple rods. It can be used not only in home gardening, but also in large fields. It is low-priced and has broad market prospects.

[0040] The nutrient controlled-release stick provided by the utility model can not only realize point-type precise fertilization according to soil fertility conditions and crop growth and development stages in agricultural production, but also realize the recovery and recycling of biochar, giving full play to the characteristics of biochar adsorption, slow release and stable structure, and solving the problems of complex slow-release and controlled-release processes, poor controlled-release effects, and inability to recycle and recycle controlled-release materials in the current situation.

[0041] The nutrient controlled-release stick provided by this utility model is directly inserted into the soil near the crop root system. Due to the slow-release effect of the biochar, it can also provide a slow-release fertilizer. The controlled-release stick can be regularly removed from the soil without cleaning. After drying for 30 to 60 minutes, it can be immersed in a specific nutrient solution for re-adsorption and then reinserted into the original position. This not only reduces the amount of farmland work but also enables the recycling of the controlled-release stick. The purpose of drying the controlled-release stick provided by the utility model is to promote the rapid adsorption of nutrients.

[0042] The nutrient controlled-release stick provided by the utility model is mainly applied to dryland crops. For drought-prone areas, moisture can be regularly added to the root zone during use to promote the release of nutrient elements and their migration and absorption in the soil.

[0043] The controlled-release rod provided by the utility model can be reused multiple times, and whether to replace the carbon rod can be determined based on the degree of damage to the carbon rod during its service life.

[0044] The above description is only a preferred specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A biochar-based nutrient controlled-release stick, characterized in that: The composite carbon rod body (4) comprises a biochar layer (3) and a carbon fiber layer (2), the carbon fiber layer (2) is wrapped around the outer side of the biochar layer (3), and the outer wall of the carbon fiber layer (2) is covered with a filter layer (1).

2. The biochar-based nutrient controlled-release stick according to claim 1, characterized in that: The biochar layer (3) and the carbon fiber layer (2) are fixedly bonded together by hot melt adhesive, and the carbon fiber layer (2) and the filter layer (1) are fixedly bonded together by hot melt adhesive.

3. The biochar-based nutrient controlled-release stick according to claim 2, characterized in that: The hot melt adhesive is an EVA hot melt adhesive.

4. The biochar-based nutrient controlled-release rod according to claim 1, characterized in that: The biochar layer (3) is a composite layer of any one or more of a straw biochar layer, a forest waste biochar layer, and a fruit shell biochar layer.

5. The biochar-based nutrient controlled-release stick according to claim 1, characterized in that: The diameter of the biochar layer (3) is 3 mm to 9 mm.

6. The biochar-based nutrient controlled-release rod according to claim 1, characterized in that: The thickness of the carbon fiber layer (2) is 1 mm to 2 mm.

7. The biochar-based nutrient controlled-release stick according to claim 1, characterized in that: The composite carbon rod body (4) has a diameter of 5 mm to 10 mm and a length of 60 mm to 70 mm.

8. The biochar-based nutrient controlled-release stick according to claim 1, characterized in that: The filter layer (1) is a filter cloth with a thickness of 0.25 mm to 0.55 mm.

9. The biochar-based nutrient controlled-release rod according to claim 7, characterized in that: The specification of the filter layer (1) is 150mm×150mm~200mm×200mm.

10. The biochar-based nutrient controlled-release rod according to claim 7, characterized in that: The filter layer (1) is a fine-pored nylon cloth, and the pore size of the fine-pored nylon cloth is 20 meshes to 100 meshes.

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