What saplings are suitable for planting in the landfill, and the soil layer is 50cm thick, what is s

Considering your soil environment and soil thickness, it is recommended that the crown poplar can effectively improve the soil environment, and the natural resistance is strong, and a large area of natural economic forest can be formed, which is easy to maintain and has high market demand.

Osmanthus prefers a warm environment and should grow in a deep, well-drained, fertile, humus-rich acidic sandy soil. Not tolerant to drought and barrenness, in the shallow and barren soil, the growth is particularly slow, the branches and leaves are scarce, the leaves are thin, the leaf color is yellow, there is no flowering or very little flowering, and even there is a periodic withering phenomenon, and the whole osmanthus plant dies when it is serious.

The traditional method of potting soil is mainly composting. It is made by using garbage, leaves, weeds and other wastes that do not contain chemical pollution as the main raw materials, adding pigs, sheep and horse manure, adding water and soil. Before stacking, the stacking site should be leveled, the debris should be removed, a layer of fine sand should be laid, and then the above substances should be piled up in a cuboid or cone, and the wind and sun should be basked and mixed for 1 time, and the flower farmers should weigh the manure until all are decomposed.

Then according to 2000 2500 kilograms per mu, evenly sprinkled in the cultivation field, and then ploughed the cultivation land. The depth of ploughing should be determined according to the size of the seedlings, usually the small seedling stage should not be less than 30 cm, and the larger seedling should not be less than 35 cm. When the plant height is more than 5 meters, it should be applied according to the planting hole, and the pot is prepared with 40 garden soil, 30 fine sand soil and 30 compost.

This soil formulation is suitable for small plant applications. Whether it is necessary to change the soil depends on the soil density, high-density soil or soil with too many impurities need to be replaced with soil suitable for the growth of osmanthus flowers; ordinary garden soil or other loose, permeable and well-drained soil does not need to change the soil; it can be planted directly after fertilization.

Osmanthus bonsai cultivation requires suitable pots and soil in good conditions, and it is recommended to use loose, breathable, well-drained slightly acidic soil. The breeding environment needs to have sufficient light to promote the photosynthesis of plants. Regular watering keeps the potting soil moist, and fertilizing during the growing season is beneficial for growth and flowering.

There are many pathogenic microorganisms in garbage, and garbage is often a breeding ground for mosquitoes, flies, cockroaches and rats.

So growing crops here will inevitably be affected by garbage.

1. There are various uncertain factors such as fine bacteria and microorganisms in the landfill source field that affect human health.

2. The garbage is covered with soil after landfilling, and the garbage ferments and decomposes in it, resulting in the possibility of ground subsidence. So you can't build a house on it.

3. There are a large number of heavy metals in garbage, and crops will absorb harmful substances to humans in the soil, among which heavy metals are one of them.

2-3cm is almost enough, too thick affects transportation, too thin affects use, so about 2cm is just right.

Turf maintenance tips

1. As the temperature rises in summer, the watering frequency of the lawn must be adjusted in time to prevent the lawn from drying out and yellowing.

2. Proper watering and insufficient watering may weaken the resistance of the lawn, making the lawn susceptible to diseases and weeds.

3. Environmental protection fertilization: Lawn fertilization should pay attention to environmental protection.

4. Turf with poor pest control and lack of good maintenance is susceptible to insect attack, so the lawn's fertilization, irrigation and hoeing measures should be checked before using insecticides.

5. Decorate the lawn If you want to mow the lawn to resemble a professional baseball field"Bars"or"Blocky"patterned lawn that can be passed"Round-trip pruning"Implement.

200mm thick planting soil is completely sufficient. However, since the original design generally did not consider the terrace turf, the uniform load of this layer was not considered. Before you push the earth on the terrace, you should reinforce the terrace structure, and on the surface where the soil and the terrace are in contact, you must be equipped with a waterproof layer, because if the reinforced concrete that is not considered to work in a humid environment is not considered to be in a humid environment, it will cause steel rust for a long time, resulting in structural safety hazards.

Planting grass on the terrace (roof greening), you can use the planting soil for the garden, the physical and chemical properties of the planting soil are good, the structure is loose, aeration, water and fertilizer retention capacity is strong, and the bulk density is small, suitable for the growth of garden plants, as for the thickness of the soil, 50cm below is no problem.

20cm is about the same, too thick will have an impact on the load-bearing of the roof.

The thinnest point is 200 grading 6, organizing drainage.

1. Pinus tabuliformis is a positive tree species, deep-rooted, light-loving, barren-resistant, wind-resistant, and can grow on acidic, neutral or calcareous loess with deep soil layer and good drainage, and a temperature of -25. It likes dry and cold climate, is distributed in southern Jilin, Liaoning, Inner Mongolia and other provinces and regions, and is born at an altitude of 100-2600 meters, mostly composed of simple forests.

2. Pinus sylvestris.

Evergreen tree, 15-25 meters tall and up to 30 meters high, with an oval or conical crown. The trunk is straight, stiff, often slightly twisted, with a pointed apex. Monoecious, male flowers ovate, yellow, clustered in the lower part of the current year's branches; Female bulbs are spherical or ovate, purplish-brown.

The cones are long ovate.

It is produced in the mountains of Daxing'an Mountains, Heilongjiang Province, China at an altitude of 400-900 meters above sea level and the sand dunes west and south of Hailar. It can be used as a garden ornamental and greening tree. The forest tree grows quickly, has good material and strong adaptability, and can be used as a afforestation tree species in the mountainous area of the Daxing'an Mountains in Northeast China and the sand dunes in the west.

3. Red pine. Korean pine, gymnosperms, evergreen trees, up to 40 meters high. The twigs are densely pubescent brown. The leaves are 5 needles in a bunch, coarse and hard, with 3 resin tracts, and the leaf sheath falls early.

It is produced from Changbai Mountain to Xiaoxing'an Mountains in northeast China, and is often mixed with ichthyosis pine and red spruce. It is cold tolerant and prefers slightly acidic soil or neutral soil.

4. Birch. Deciduous tree with trunks up to 25 m high and 50 cm thick. The leaves of birch are single-leafed alternate, the leaf margins are serrate, the flowers are unisexual, monoecious, and the male inflorescence is soft and drooping. Born in the slopes or forests at an altitude of 400-4100 meters, it has great adaptability and wide distribution, and there are pure forests in the large and small Xing'an Mountains and Changbai Mountains in China, which are common tree species in the broad-leaved deciduous forests and coniferous broad-leaved mixed forests in Northeast China.

5. Hung Yen larch.

A deciduous tree of the Pinaceae family and the genus Larch. It grows mainly in northeast China. Born on gentle slopes, it often forms pure forests or is mixed with sandy spruce.

The wood grain is straight, the structure is fine, there is resin, and it is durable; The bark can be extracted from tannin gum; The trunk can be harvested and cut pine resin is the main forest tree species in the forest area of Northeast China, which is cold-tolerant and has a wide range of adaptability, and is distributed in the large and small Xing'an Mountains.

Trees such as wisteria, elm, torch tree, gold and silver wood, birch, etc., are suitable for growing in the Northeast, and these trees are hardy, which is explained as follows:

1. Wisteria. Leguminous wisteria, deciduous climbing winding vine, strong adaptability to climate and soil, more cold-tolerant, can tolerate moisture and barren soil, light-loving, more shade-tolerant. The flowering period is from April to May, and the fruit ripens from August to September. The taproot is deep, the lateral roots are shallow, and it is not resistant to transplanting.

It grows faster and has a long lifespan. It has a strong winding ability, and it has a strangling effect on other plants.

2. Elm. Light-loving, drought-tolerant, cold-tolerant, barren-tolerant, soil-free, and very adaptable. The root system is well developed, and the wind resistance and soil retention are strong. Strong germination and resistance to pruning.

Fast growth and long lifespan. It can tolerate dry and cold climates and moderate salinity, but not water and humidity (can withstand waterlogging in the rainy season). It has anti-pollution and strong foliar dust retention ability.

It is distributed in northeastern, northern, northwest and southwestern provinces and regions of China, as well as in North Korea, the former Soviet Union and Mongolia. Born on mountain slopes, valleys, rivers, hills and sand hills below 1000-2500 meters above sea level.

3. Torch tree.

Light-loving, cold-resistant, adaptable to soil, drought and barrenness, moisture-resistant, salt-alkali resistant. The root system is well developed, the tillering is strong, and 30 to 50 sprouting tillers can be germinated within four years. Shallow-rooted, fast-growing and short-lived.

It is distributed in the warm temperate deciduous broad-leaved forest areas of North China and the north of North China.

4. Gold and silver wood.

Honeysuckle is a deciduous shrub up to 6 m tall with a stem diameter of up to 10 cm; The flowering period is from May to June, and the fruit ripening period is from August to October, and the fruit does not fall in winter. Strong, light-loving, semi-shade-tolerant, drought-tolerant, cold-tolerant. Old piles can be used to make pots.

5. Birch. Born in the slopes or forests at an altitude of 400-4100 meters, it has great adaptability and wide distribution, especially prefers moist soil, and is the pioneer tree species of secondary forests. There are patches of pure forests in the Greater and Lesser Xing'an Mountains and Changbai Mountains in China, and they are also common tree species in broad-leaved deciduous forests and coniferous broad-leaved mixed forests in the mountainous areas of the North China Plain, the Loess Plateau, and the southwest mountains.

Loves light and is not tolerant of shade. Resistant to bitter cold. It has strong adaptability to soil, likes acidic soil, and can grow in swamps, dry sunny slopes and moist shady slopes.

It is deep-rooted, barren and thin, and is often mixed with Korean pine, larch, aspen, and Mongolian oak or becomes a pure forest. Natural renewal is good, grows faster, germinates strongly, and has a shorter lifespan.

The species of trees suitable for planting in the north are as follows:

1. Deciduous trees: Salix, Hebei poplar, Acacia, Acer truncatum, walnut, Begonia flower version, Peach, Eucommia, Elm, Tsubaki, Robinia pseudoacacia, Luan, Tung tree, Ginkgo, persimmon, white ash, small leaf Pu, etc.

2. Evergreen tree species: big-leaved privet, Pinus tabuliformis, juniper, oriental cypress, dragon cypress, cedar, whitebark pine, paving cypress, large-leaved boxwood, small-leaved boxwood, etc.

3. Deciduous shrubs:

Right gold and silver wood, brocade flower, begonia, pearl plum, sticky stem begonia, elm leaf plum, yellow thorn rose, modern moon season, rose, plum, lilac, spring, wood jin, crape myrtle, bauhinia, pomegranate, forsythia, red ruimu, Tianmu Qionghua, peony, hibiscus, meadowsweet, ligustrum, Haizhou Changshan, etc.