Sowing and propagation techniques of potted Catharanthus roseus

Catharanthus roseus has 750 seeds per gram, and the optimum temperature for germination is 18-24 ℃. It can be sowed in spring in April, and the mixed soil of rotten leaf soil, culture soil and fine sand can be disinfected by sowing Pansheng, and germinate 14-21 days after sowing. After emergence, at noon when the light is strong and the temperature is high, shade should be added for 2-3 hours. When the seedling is 5 cm tall and has 3 pairs of true leaves, it can be potted.

1. Seed collection time:

The ripening period of Catharanthus roseus fruit is different due to different flowering time, so the seeds should be picked along with ripening. After the fruit is ripe and the color turns black, the skin is easy to crack and lose the seeds, so it is necessary to collect seeds in time. When you see the pericarp yellowing and can vaguely reflect the black seeds inside, it should be harvested.

2. Sowing time:

The suitable temperature for seed germination is 20-25 ℃, which is usually sown and propagated from March to May, and is cultivated for more than one year. In order to bloom early, the seedlings can be sowed and raised in the greenhouse in early spring. Under the environment of 20 ℃, the warm spring can be moved to the open field for cultivation.

3. Seedbed preparation:

The nursery bed should choose a place with high and cool terrain, facing south to the sun and good drainage. The matrix is best prepared with peat + perlite according to 3 ∶ 1, or rotten leaf soil, poured thoroughly with 500 to 600 times carbendazim solution, slightly dried, loosened and leveled the land to make a 1.2m wide border surface.

4. Sowing technology:

Sow seeds with sowing method, about 1000 seeds per square meter. Cover the seeds with fine sand after sowing, do not make the seeds see the light directly, pour enough water with a fine spray pot, cover with a thin film or grass curtain to keep the soil moist, and the seedlings can emerge in 7 days and 10 days. Remove the film or grass curtain after emergence and gradually increase the light. The growth was slow in the seedling period and faster when the temperature increased. It takes time to grow. In order to prevent Catharanthus roseus quenching disease, 800 times chlorothalonil or methyl topiramate should be sprayed once a week for 2 to 3 weeks.

Time: 2019-06-11 Click: