The root system of Platycladus orientalis is well-developed, resistant to drought and barren, and has strong adaptability. It is the main planting tree species in the barren hills in northern China. Accelerate the speed of juniper seedlings and improve the quality of seedlings
It is the key to increase the efficiency of the nursery. After many years of practice, the author adopted the method of timely seed collection and early sowing to strengthen the management of the nursery, which can not only prolong
The growth period of Platycladus orientalis can effectively avoid the occurrence of blight.
1 Selection and Establishment of Nursery Land
111 The choice of nursery site is to choose an open, flat, well-irrigated place with good drainage. The soil p H value is 610-810, the irrigation water salt content is not more than 0,111%, not
Sandy loam, loam or light clay less than 50 cm thick can grow normally.
112 Establishment of a nursery
11211 Nursery preparation
In arid regions, in order to ensure the survival rate, the arborvitae afforestation generally uses container nursery. In order to reduce the gap between the nutrition bags and increase the density, the filling of the nutrition bag should be
20-30 days before sowing (around mid-August).
11212 Bed
In areas with low natural precipitation and high irrigation costs, low bed nursery is generally used to facilitate the management of seedlings at later stages. Bed width 90 to 120 cm, length according to soil
Flatness may be determined, 30 ~ 50 m is appropriate. Deeply dig 10-12 cm, pile up the topsoil, reserve ridges, soil ridge width 40 cm, compaction. The bed should be flat, with ridges and bed bottoms
The height difference should reach 18-20 cm.
11213 Nutrition bag filling
The provision of nutritious soil depends on local conditions. In areas with non-mucky soils, soil and farmyard fertilizers are mixed in a ratio of 3:1, and about 1% of phosphorus is mixed at the same time.
Fertilizer and 10-15 kg/667 m2 of ferrous sulfate are used for soil disinfection, and appropriate increments should be made for heavy-duty land.) Sticky and heavy soils should be mixed with appropriate amount of fine sand, and easy to form soil.
To increase the amount of farmyard fertilizer. Fill the mixed soil with a nutrient bag (the specifications of the nutrition bag depend on the purpose of cultivation;
10 cm 15 cm, closely and vertically arranged in the seedbed, can generally discharge 180 to 200 per square meter. When arranging to minimize the gap, the bag
The mouth should be level to facilitate the watering management of the later seedlings.
2 Seed collection and germination
The 211 seed collection of Platycladus orientalis was generally mature in mid-September (ie before and after white dew exposure). 4 to 5 days before the white dew, collect the yellow-colored arborvitae cones, dry for 3 to 4 days, and wait for more than half of the ball
If you break your mouth, you can shake off the seeds and promptly germination. In the year when the rain is normal, 1 kg of seeds per 12 kg of arborvitae cones can be obtained.
The amount of seedlings used is about 7 kg/667 m2. Based on this, the number of cones collected can be calculated.
212 Seed germination Pour warm water of 50-60 °C into the container of Sheng Sheng (water, species ratio is 3 : 1), continue stirring to ambient temperature, place for 24 h, remove the empty shell floating on the water surface.
And kind of species. Remove the seed that has settled under the container and place it on a ventilated wet pad in a warm place for germination. In order to ensure the germination effect, it must be maintained
The seed is moist (but there can be no accumulation of water) and a layer of wet cloth or film can be placed on the seed. Turning once a day, 4 to 5 days later, check that there are about 60% of the seeds
Dew can be sown.
3 sowing and filming 2 to 3 days in advance of watering 1 times. 3 to 4 seeds per bag. Cover soil (soil weight should be replaced with fine sand) Don't over-thick, just cover the seed, so
To ensure that the emergence of neat and tidy. Too thick is not conducive to seed germination and soil erosion, and even mildew. In order to maintain the soil moisture and extend the seedling growth time, the seedlings can be safely wintered
After sowing, it should be covered with film. Both sides of the mulch are laid on the ridges and the soil is used for cultivation. After one week of filming, the seeds started to sprout and half of the time
Can be out. In Shandong, before the onset of winter, the seedlings excavated generally have 40 to 50 days of growth and development time, and the seedling height energy reaches 5 to 8 cm. If weeds are found during the period
You can poke a small hole from the membrane to weed.
4 Field Management
411 Water and fertilization The annual precipitation in Shandong Province is generally 700 mm. It is unevenly distributed throughout the year. It is characterized by dry and windy springs, concentrated summer rainfall, and dry and dry rain in autumn and winter. According to this feature,
Mainly grasp the following aspects of watering management. In late March, the temperature returned, the seedlings began to turn green, and water was withdrawn early. Before watering, evenly spread the seedlings
A small amount of nitrogen fertilizer (urea 5 kg / 667 m2 or so). In late April, before the arrival of dry hot wind, pour 2nd groundwater (spray urea evenly before pouring 715 kg/
667 m2 and ferrous sulfate 10 kg/ 667 m2 ). In mid-late and late May, the seedlings will leave a strong seedling in each nutrient bag; if the seedbed is arid, it should be poured one more time (before pouring
Spread the urea 10 kg/ 667 m2 ). When afforested during the rainy season, the seedlings can reach a height of about 30 cm and can be planted out of a garden. To keep a garden nursery,
According to the weather forecast, before the heavy rain, urea can be evenly spread, not exceeding 715 kg each time, to prevent the seedling from being burned due to insufficient rainfall. At the end of the rainy season, stop fertilizing.
It is conducive to fully lignified seedlings. In September and October, if there is a long period of drought and no rain, one more pour of water is required. Before the soil is frozen, groundwater must be poured once. The average height of seedlings in the fall
The degree can reach about 70 cm.
412 Insect pest control generally occurs around May of each year. Affected by high temperature and dry weather, seedlings are prone to blight. The method of raising seedlings by the method and the conventional autumn sowing and spring seedling raising method
In contrast, the seedling base has already begun to lignify at this time, and the resistance is stronger; and the seedlings have two times watering and fertilizing, and the growth potential is strong, so that the ability to prevent the seedlings from causing the blight disease is better.
Enhanced. The pests that affect Platycladus orientalis are mainly pupa and pupa. The phoxim (50 % emulsion) 011 % to 01125 % solution can be uniformly sprayed in the seedbed.
The control effect is very good. This technology is very practical in areas with certain irrigation conditions where the cost is relatively high and it is windy and rainy in spring and the dry hot wind is more severe in the later period. Put
Holding three “early†characters (early seeding, early sowing, and early spring water and fertilizer management), can extend the growth period of nearly 2 months compared with conventional methods (autumn sowing or spring sowing)
It can also effectively prevent seedling blight (common disease) from occurring; it can make full use of the land in the growing season, reduce the cost of production management, and the economic benefits are significant.
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