1. Seed selection and time for autumn sowing
Except for seeds with small seeds and high water content, most seeds can be sown in autumn, especially deep dormant seeds, such as pewter, yellow jujube, peach, apricot, walnut, etc., suitable for autumn sowing, avoiding seed storage and Germination process. The disadvantage is that it is easily harmed by birds, rats and other animals after sowing. If unearthed early the following spring, it is easy to be damaged by night frost. In the windy weather in winter, many places are vulnerable to erosion and sand pressure. Autumn sowing should not be too early, usually in late October to before the soil freezes before November.
2. Seeding methods and technical points
1. Drilling: Drilling is the main method of uniformly sowing in the sowing ditch at a certain interval. The main advantage is that the seedlings have a certain row spacing, which is convenient for soil management and seedling cultivation, such as cultivation, weeding, fertilization, seedling thinning, pest control, etc.; good lighting and ventilation conditions, strong growth of seedlings and high quality; saving seeds and easy seedling cultivation. The width of the strips is generally 5-10cm, the row spacing with broadleaf trees is 20-30cm, and the row spacing with coniferous trees is 10-20cm.
2. Sowing: Spread the seeds evenly on the seedling bed. It has the advantage of high seedling yield and is mainly used for sowing very small seeds such as poplar, willow and larch. The amount of seeds is large. Tree species with insufficient provenance and precious species are not recommended.
3. On-demand sowing: The seeds are sown on the seedling bed according to a certain row spacing. They are generally used for large seeds such as walnuts, apricots, and walnuts. If transplanting is not required, the seedlings used as rootstocks are often sown on demand, such as jujube grafted with jujube, The shortcomings of apricot grafted peaches are low seedling production and labor intensive.
3. Seedling density and seeding rate
Sowing seedlings should choose the appropriate density. Suitable density refers to the density of seedlings with higher quality indicators, the highest yield of qualified seedlings, and the most economical benefits. The sowing amount refers to the weight of seeds sown per unit area or per unit length on the sowing line. Large seeds can be the number of seeds. The sowing amount directly determines the density of seedlings. A reasonable sowing amount can not only save seeds, but also eliminate unnecessary labor such as thinning. Make full use of land, reduce investment, increase income, and improve economic efficiency. According to relevant information and production experience, determine a reasonable seeding rate. The specific value of the same tree species in different environments may be different, which can be determined through experiments in different locations.
4. Planting land management
1. Covering: After sowing the seeds of conifers and broadleaf trees, it is necessary to cover some straw mats to adjust the surface temperature, prevent soil compaction, retain water and prevent bird damage. Covering materials can be obtained locally, using wheat, straw, branches, etc., but care should be taken not to carry weed seeds and pests. The straw should not be too thick, cover 3 to 5 cm, and not expose the seedbed. When the seeds germinate and emerge, the covering should be removed in time. At present, the effect of plastic film in production is the best. It can not only fully achieve the above-mentioned covering purpose, but also increase the surface temperature by 2°C to 4°C, which is conducive to seed germination and growth.
2. Irrigation: In plain irrigated areas, seedling farms are generally all watered in the first winter. When sowing in the next spring, the moisture content can fully meet the needs of seed germination. In dry and sandy areas, the bottom water must be irrigated before planting, and then planted. If the nursery is rain-filled, you can also irrigate after sowing. The soil moisture is suitable after spring sowing. Generally speaking, watering should be avoided as much as possible after sowing and before emergence. If the weather is dry and the soil moisture is poor, irrigation should be done in time. Irrigation before emergence is mainly suitable for small seeds such as poplar and willow. For example, poplar, willow, larch, etc., use sprinkler irrigation or artificial watering more often, and keep the bed surface moist. Generally, sandy land has poor water conditions, so it is necessary to irrigate before the seedlings emerge. There are also some tree species, such as flower sticks, which cannot be irrigated about 1 month after emergence, otherwise the seedlings will die.
3. Soil loosening and weeding: Before the seeds are unearthed, the nursery is easy to breed weeds, or the soil is compacted due to rainfall or irrigation, which requires loosening and weeding.
Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
Expanded Metal
Expanded metal also named diamond metal mesh, that uses the high quality low carbon steel plate, aluminium plate, stainless steel plate, galvanized steel plate, nickel plate, titanium plate, lead plate and so on be punched to mesh. Expanded metal mesh including: standard expanded metal, flattened expanded metal, architectural expanded metal, micro expanded metal, ribbon expanded metal, custom fabricated expanded metal.
The surface treatment of expanded metal sheet: PVC coated, galvanized, anodizing, antirust painted
The material: high quality low carbon steel plate, aluminium plate, stainless steel plate, galvanized steel plate, nickel plate, titanium plate, lead plate
The uses of expanded metal panel: Filter Mesh, Filter Cartridge, platforms, catwalks, walkways, decorative building, rail enclosures, conveyors, etc
The advantages of expanded metal:
beautiful, strong and durable
uniform mesh, smooth surface, high friction coefficient and strength
easy cutting and process
The mesh is firm
shockproof
resistant to high temperature
no deformation, no rust
non-toxic and tasteless
easy to use
Expanded Copper Mesh,Copper Expanded Mesh,Decorative Expanded Mesh,Stainless Steel Expanded Metal
ANPING COUNTY SHANGCHEN WIREMESH PRODUCTS CO.,LTD , https://www.scwiremesh.com