Kapok seeds can be harvested when they are mature from April to May. Due to the high oil content of the seed, it is easy to become bad and lose germination power, so it is generally required to sow in time in the year after harvest.
Seedbed seedlings are sown and sown in rows with a spacing of 20cm and a depth of 5cm. Seeds are required in the ditch. Covering soil with 2 cm, covering grass with topsoil, germinating in 6-7 days after sowing, and almost all germinating in 13-15 days. After the seedlings are unearthed, the soil shall be loosened in time for weeding, and the seedlings shall be intercropped properly for weeding, and the prevention and control of diseases and pests shall be paid attention to. When the height of seedlings is 4-5cm and there are more than two primary leaves, they can be transferred into the nutrition bag, and the height of seedlings is about 40cm, which can be transplanted to cultivate large seedlings. When the DBH of seedlings is 1-115 cm, they can be grafted.
Kapok should be grafted in February, March and June, July. From February to March, the temperature picked up quickly, and kapok began to sprout and shoot, at this time, the grafting survival rate was high. High temperature from April to may may may easily lead to dry scion. In June July, the rainy season is more concentrated in Panzhihua area, and the temperature is lower, so the grafting should avoid rainy days.
From the flowering kapok mother tree, the two-year growth of healthy, full, full bud, disease and pest free branches were selected as scions. The diameter of the scion should be 0.17-1.2cm and the distance between the eyes should be 1-2cm. Cut off the leaves immediately to reduce the water loss of the branches. Wrap the branches in a wet towel in a cool place. It's better to use them as you pick them. When the scion needs to be stored for several days, both ends of the scion can be sealed with paraffin and buried in the sand bed, covering the sand layer with a thickness of 4-6cm, and pay attention to moisture preservation and ventilation.
It was found that no matter how many buds were left in the scion, when the first bud sprouted, the other bud eye germination was inhibited.
When grafting, the scion should be cut first. The method is: select a full bud on the scion, cut a plane with a length of 1.5-2CM without xylem at 0.15cm at the lower end of the reverse side, cut a 45 ° oblique section at the reverse side, cut it at 1cm at the upper end of the bud, and the length of the scion is 4cm. For the rootstock seedlings, it is required to cut the anvil at a height of 15 cm from the ground, and cut a knife at the flat and smooth surface of the rootstock, with a length of 1.15-2 cm. It is better to insert the cut scion into the marriage interface, so that the formation layers on both sides are aligned and closely connected, and the upper end of the scion is exposed. Finally, the plastic film belt is used to bind tightly from bottom to top, and only one layer of grafting film is wrapped at the eye of scion bud, which is easy to break the film automatically after grafting.
Kapok leaves
[supplementary grafting] after grafting for 10-15 days, the survival condition can be checked. The bud is in fresh state, and if you touch the petiole lightly, it means survival; if the scion turns brown, the petiole is not easy to fall off, and if you pinch the scion and become soft, it means that the grafting is not survival, you should immediately make up the grafting.
After grafting, the scion bud will break the membrane automatically. The sprouting of grafted new shoots is slow. The first several new leaves are pink. After about 2-3 weeks, the leaves turn green and unfold. When the young leaves turn green and flatten completely, the wrapped plastic film can be loosened to avoid affecting the growth of new shoots. However, the union of the marriage interface could not be untied immediately to protect the scion from damage.
[sprout removal] for the grafted seedlings, the sprouts on the rootstock should be removed at any time so that the nutrients can be supplied to the grafted shoots.
[other management] timely middle ploughing and reasonable watering, emphasizing the application of thin fertilizer and heavy nitrogen fertilizer. The new shoots are mostly harmed by leaf beetles and foot moths, such as alder leaf beetles and Coptis foot moth larvae. When there is a small amount of harm, it can be killed manually. When the harm area is large, chemical control is used: 80% dichlorvos or 50% fenitrothion 800 times solution, 25% phosphine emulsion 800-1 & nbsp; 000 times solution, 80% Chlordimeform 1 & nbsp; 000 times solution, etc.
Seed collection: when the capsule is mature, it is easy to burst, and the seeds are scattered with the cotton, so it is necessary to collect before the fruit is cracked.
Sowing: it can be planted into the soil in March in spring.
