Rapid Seedling raising technique of Metasequoia glyptostroboides

1. Make a bed by preparing the ground

It is required to raise seedlings with conventional small seeds. Bed width 100cm, high 20cm, slightly suppressed after leveling, sprinkled with 3G per square meter to control underground pests and @ # @ 254kg / m2. The nursery bed for raising seedlings will be ready before the middle of February. Every 500g seeds will be sown in the 20m2 seedbed and can be used for field transplanting in the future. The field transplanting seedbed will be ready by late March.

two。 Sowing at the right time

Sowing time is the key. Temperature had a great effect on the underground part of seedlings, and lower air temperature could inhibit the growth of main roots and promote the germination of lateral roots. Under the condition of Tongxiang, Zhejiang, the suitable sowing time for Metasequoia glyptostroboides seeds is from late February to early March. Proper early sowing can not only increase the seedling emergence rate and seedling growth rate, but also prolong the growth period and make the roots of seedlings basically lignified before the arrival of hot summer, thus improving the ability of sunburn resistance, drought resistance and disease resistance, which is beneficial to the improvement of seedling quality. it can also alleviate the contradiction of labor struggle with agriculture and is conducive to the reasonable arrangement of agriculture.

The seeds were soaked in 0.5-1% copper sulfate solution for four hours before sowing, then rinsed with clean water after being taken out, and then sowed in the seedbed after slightly drying. The sowing rate is 25g/m2, which requires uniform sowing so that each seedling has a certain nutritional area.

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After sowing, Metasequoia glyptostroboides is covered with screened and moist Qingshui river sand (avoid sea sand), which is about 0.5cm thick, and then covered with a new plastic film on top of the river sand, which is not removed until the seedlings break the soil and emerge, so as to keep moisture and keep warm. In order to be more conducive to the growth of seedlings, each seedling bed should also set up an arched shed with high 60cm, covered with new polyethylene film, and covered with straw slices tonight, which is conducive to heat preservation. The transparency of the new film is good, which plays a significant role in improving the temperature and humidity in the shed. However, when the seedlings are unearthed, it is necessary to replace the new film on the scaffolding with the old film to reduce the transparency and avoid the burns of the newly unearthed seedlings caused by excessive light. The temperature in the greenhouse should generally be kept at 30-35 ℃, which should be adjusted by uncovering and covering the film. Especially at noon, we should pay attention to observation when the sun is strong, so as to avoid the loss of burning seedlings. At the same time, attention should be paid to keeping the seedbed moist, and the soil should be rehydrated in time when the soil is dry, so as to facilitate the emergence and growth of seedlings. When the seedlings have 2-3 pairs of true leaves, gradually remove the film, refine the seedlings, and prepare for transplanting.

4. Disease prevention and cure

It is the main harm of Metasequoia glyptostroboides seedlings. When the seed shell comes out of the soil, the whole bed is sprayed with 80-1000 times of carbendazim solution, so that the seedlings go through a medicine bath, which can not only prevent disease, but also supply water, and get two things with one stone. When the true leaves are sprayed again as in the previous method, the harm of blight can be prevented and controlled in the seedling stage.

5. Meticulous seedling transfer

In late March or early April, when the seedlings have 2-3 pairs of true leaves, after several days of seedling refining, use a small crowbar to pry up the seedlings slowly, and take a small piece of soil at the base as far as possible, try not to hurt the roots and leaves, and transplant one by one, with row spacing of 20cm × 25cm, 12-18 plants per square meter, which must be completed in the first ten days of April. After the temperature continues to rise, evaporation increases, which is not conducive to survival, so it can not be transplanted. Generally speaking, each person can plant 1500 plants, pry seedlings, transplant at the same time, and pour through the fixed root water in time, the survival rate can reach more than 90%. Other management measures are the same as conventional seedling raising.