First, the farmyard manure should be decomposed: greenhouse vegetables should be fully decomposed when applying farmyard manure. Because there are no pathogens and eggs in the mature farmyard fertilizer, it is easy to spread the disease after being applied to the vegetables. In addition, if the farmyard manure is placed in a greenhouse and then decomposed, ammonia burning seedlings will be produced. Therefore, the farmyard manure should be fully decomposed and then applied. The farmer's fertilizer has complete nutrient content and long-lasting fertilizer effect. After application, it can not only improve the soil of vegetable fields, but also provide a variety of nutrients for vegetables. At least 3 square meters of farmyard manure per acre.
Second, the fertilization method should be scientific and reasonable: The bottom fertilizer should be applied a week before the vegetable is planted, and it should be evenly mixed with the soil. Topdressing can be applied at a distance of 7-10 cm from the plant or at a point. After topdressing, soil should be covered and watered. Do not spread the fertilizer directly on the ground or plants to prevent the fertilizer from volatilizing or burning vegetable seedlings. The top dressing should be carried out at the peak of the fertilizer required for vegetables and in the later stage of vegetable growth. It is best to choose it on a cloudy or evening day. Spray the fertilizer on the back of the new leaves and leaves as much as possible to facilitate the absorption of the vegetables.
Third, the application of chemical fertilizers should be appropriate: the fertilizer in the greenhouse is not easy to lose, excessive application of chemical fertilizers, can cause the increase of salt concentration in the soil, leading to soil salinization. To control nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer. In the management of greenhouse vegetables, increase the ventilation time and enhance the light intensity, which can reduce the nitrate content of vegetables. It is not advisable to apply chlorinated fertilizer, because chloride ion can reduce the starch content in vegetables, make the quality worse, and it is easy to cause soil compaction in the soil.
Fourth, the application of micro-fertilizer should be appropriate: Although the demand for trace element fertilizer in vegetables is small, its role in vegetable metabolism is very large, which can greatly improve the quality of vegetables. Currently used micro-fertilizers include boron, molybdenum, zinc, iron fertilizer, and the like. Micro-fertilizer is used as a base fertilizer, and can also be used for seed dressing, soaking seeds or top dressing. The range between the amount of micro-fertilizer and the excess is relatively narrow, so the dosage must be accurate to avoid causing damage.
5. Use plant growth regulators properly: Plant growth regulators (such as gibberellin, ethephon, 2,4-D, paclobutrazol, etc.) can promote the increase of vegetables if used reasonably, but each regulator is There are certain conditions and scopes for application. In particular, it is necessary to master the time and concentration of use. It should not be sloppy, otherwise it will not achieve the effect of increasing the yield of vegetables, and people's long-term consumption will also be detrimental to their health.
6. Apply vegetable-specific fertilizer as much as possible: Promote vegetable-specific compound fertilizer under the premise of formula fertilization. The special fertilizer is determined according to the fertilizer characteristics of different vegetables and the soil fertilization status. The nutrients are more complete, the nutrition is more scientific, the formula is more reasonable, and the pertinence is stronger. After application, the yield and quality of greenhouse vegetables can be significantly improved.
Huaxian Agricultural Technology Promotion Center Liu Xiuling
Abrasive Lapping film is a type of polishing material used for fine abrasive finishing and polishing of surfaces. It is often employed in applications where a high degree of precision and surface quality is required. The key characteristics and applications of abrasive lapping film:
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Composition: Abrasive Lapping film typically consists of a flexible backing material onto which abrasive particles are evenly coated. The abrasive particles can vary and may include materials like aluminum oxide, silicon carbide, diamond, cerium oxide, or other abrasives.
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Manufacturing Process: The film is manufactured using advanced coating technology, ensuring a uniform distribution of abrasive particles on the backing material. The film may undergo high-precision cutting technology to achieve specific sizes and forms.
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Grit Sizes: Similar to the Aluminum Lapping film mentioned earlier, abrasive lapping film comes in a range of grit sizes, from coarse to very fine. This allows for flexibility in addressing different levels of surface roughness and polishing requirements.
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Particle Sizes: The particle sizes of the abrasive material on the film can vary, typically ranging from larger micron-sized particles to smaller nano-sized particles, depending on the desired level of abrasiveness.
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Versatility: Abrasive lapping film is versatile and can be used on various materials, including metals, ceramics, plastics, and optical components. It is commonly utilized in precision machining, electronics, optics, and other industries where fine surface finishing is crucial.
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Adhesive Backing: Some lapping film come with a Pressure Sensitive Adhesive (PSA) backing, allowing for easy attachment to lapping plates or other polishing equipment.
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Applications:
- Precision lapping and polishing of metal and ceramic parts.
- Finishing of optical components, lenses, and mirrors.
- Polishing of semiconductor wafers and electronic components.
- Surface preparation for analysis and inspection.
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Uniform Dispersion: Similar to other precision lapping films, uniform dispersion of abrasive particles is critical for achieving consistent results in surface finishing. This ensures that the abrasive action is evenly applied across the entire surface.
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Customization: Like other lapping films, abrasive lapping films may be available in sheets, discs, or rolls, providing flexibility for different types of polishing equipment and applications. Customized products may also be available to meet specific customer needs.
Overall, abrasive lapping film is a valuable tool in industries where achieving a smooth and precise surface finish is essential. Its use is widespread in applications requiring fine polishing and finishing of various materials.
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