(1) The sowing date and seedling age of cauliflower have very close sowing dates and variety characteristics. At present, broccoli in the Yangtze River basin region has formed annual production due to reasonable varieties, but it is mainly in spring and autumn. The annual production sowing period is: early maturing species in mid-June, seedling age 25 days; medium-maturing species from late June to mid-July, seedling age 30-35 days; late-maturing seeds sown in July, seedling age 35-60 days (There are differences between different breeds). Spring cauliflower is sown from October to December. The seedling age varies with the variety, and the longest is 90 days. Hot summer and warm winter in South China, from July to November can be sown at any time. Spring planting early maturing varieties can be delayed until January to February sowing, seedling age about 35 days.
Before sowing in summer and autumn, the seeds can be immersed in cold water for about 1 hour, and then they can be removed and dried to promote the emergence of seedlings quickly and neatly.
(2) Seeding management spring sowing seedlings in the hotbed to raise seedbed temperature. Summer and autumn sowing requires seedlings under shade nets, trying to lower the temperature. Promote the use of rain seedlings.
1 temperature management. Appropriate emergence temperature of about 20 °C. After the emergence of the ground temperature dropped to below 18 °C, the daytime temperature of about 25 °C, night 8 ~ 10 °C, to prevent leggy. The seedling temperature during the seedling transfer period was raised to 18 to 20°C, and the temperature was restored to the standard before transplanting.
2 water and fertilizer management. After sowing, if the bottom of the soil is sufficient, no watering is required before emergence; otherwise, water shall be sprayed on the coverings such as straw curtains and shade nets. After emergence, depending on soil moisture watering. Should be carried out in the morning and early evening, and once foot pouring, cover the soil and protect it. After transferring the seedlings and living trees, lightly apply nitrogen fertilizer once, and then apply 4 times nitrogen fertilizer to 4 to 5 true leaves. Top dressing can be combined with watering.
15 to 20 days after sowing, when there are 3 to 4 true leaves, the seedlings are transferred by size of the seedlings (pseudo-planted early maturing species are transferred to the nutrient bowl, middle and late cooked species must be moved to the shade shed in summer and autumn, and the spacing is 7 to 10 cm. The time from transplanting seedlings to planting was as follows: 10 days for early maturing type, 5 to 6 true leaves for planting, 20 to 25 days for late-maturing varieties, and 7 to 8 true leaves for planting.
Seedlings between the seedlings are shorter, petioles are shorter, and the leaves are elliptical and larger. The leaves of the seedlings are disc-shaped and strong. The leaves are sparse, the stalk length, and the leaves are long and thin for leggy seedlings.
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