(Taxodium ascndens Brongn)
Taxodium genus of Taxodium and Taxodium.
[Morphological characteristics]
Pond fir is a deciduous tree. Leaves conical, soft, spirally arranged. Flower buds are formed in July-August, and flowering occurs only in late March. The male ball is in a cone-shaped inflorescence. The female flower is solitary and occasional, and it is born on the top of a new branch. The cones are nearly spherical in shape from October to November and are dark brown.
[Customs]
Chisan is a fast-growing tree species that is strongly positive and native to the southeastern United States. Thermophilic hot water fertilizer has strong cold resistance, is extremely resistant to flooding, and is also resistant to drought. It is rich in fertile soil and grows fastest in loose and moist acidic soils. It often appears as a geniculate root around the lake and on both sides of the river.
[Cultivation Techniques]
Breeding: Propagation by sowing or cutting, in the same way as Metasequoia.
Management: Transplantation takes place in March. Seedlings up to 1.2 m in height can be transplanted with bare roots, and large seedlings 2 m in diameter should be fitted with mudballs.
Chisan is mainly responsible for the damage of the branches and leaves of the moth, and often suffers from biting damage to the roots during the seedling stage. The poisonous baits are generally used for killing.
[use]
The pond trunks are straight and their postures are beautiful. They are the most water-resistant ones in the trees. They should be planted on the banks of the floodplain and swamps.
Nursery technology
(1) Sowing and raising seedlings
1 Seed-collecting species: Chihshang flowers from late March to early April, and mature seeds on the middle and late October. Choose a strong mother tree that is more than 15 years old. When the cone changes from yellow-green to tan, and the seed coat turns from yellow brown to dark brown, the seed matures and can be harvested. The cones were dried indoors and when the cones cracked, the seeds were gently tapped. Per 100 kilograms of fresh cones can be obtained after net dry seed 10.5-16 kg. Seed grain weight 74-118 grams. Seeds can be mixed with wet sand, but also with fruit scales.
2 Seed treatment: soaking with cold water or 40-50°C warm water for 4-5 days before sowing. Change the water once a day, remove and drain water to sow. Can also be used 3% copper sulfate or 1% urea solution soaking, good for germination, soaking with methanol for 5 minutes can increase the germination rate and early germination. In recent years, some have also adopted long-term cold water soaking to obtain good results.
3 Seeding: Chisan is sensitive to soil pH. Neutral or slightly alkaline soil seedlings, seedlings often appear yellow phenomenon, poor growth. Therefore, the groundwater level should be higher, with a pH of 5-6.5. Wet and moist sandy loam seedlings. Winter sowing is better in December, and spring sowing should be carried out in mid-to late February. Since Chisan seeds are not easy to separate from the cones, most of the seeds are sown together with the fruit scales. Seeding methods are widely used wide measures, strip width 10-15 cm, 30 cm from the pitch, ditch depth 10 cm. Fill the basal fertilizer in the trench, fill in some fine soil, and insert the seeds. Seedlings of Ficus benjamina seedlings are weakly excavated, and the cover soil should not be too thick, and about 2 cm is appropriate. After covering the soil, a layer of straw or mulch is applied to protect the soil and prevent soil compaction. Thirty to fifty grains per m are sown, 120-150 kilograms per hectare, equivalent to 300-350 kilograms of shelled seeds.
4 tending management points: Chi Bin embryonic axis long and crisp, should pay attention to promptly remove the grass cover to prevent injury. Then according to the emergence of the seedlings, it will be meticulously filled up tomorrow to make the seedlings evenly distributed. Entering the seedling stage, seedlings are sensitive to water deficits, and water management is especially important, and the seedbeds should always be kept moist. Afterwards, topdressing should also be increased, but pay attention to a small amount of time (lower concentration), from late May to mid-August, catch fertilizer once every 2-4 weeks, with urea, fertilizer amount per hectare is 150-225 kg. In order to prevent yellow seedlings, proper amount of ferrous sulfate should also be applied in time. Every time after fertilization and irrigation, weeding should be done immediately. The seedlings of Taxodium chinensis were grown 0.8-1m in height and 0.8-1cm in diameter, producing 300,000-450000 plants per hectare.
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