Cultivated broccoli in summer and autumn, the whole growth period is in a high temperature environment, it is required to pay attention to the selection of early-maturing varieties with heat resistance and disease resistance, mainly including: 60 days of Qingnong, 65 days of Qingnong, and 70 days of Qingnong.
Nursery
Preparation before seedling: It is necessary to choose a plot with high ground, cool and ventilated, capable of irrigating, and fertile soil. Deep-drying before planting. Break the clods, apply 100-150 kg of high-quality farmyard manure per sifting, 0.5 kg of ternary compound fertilizer, and mix well with the soil. It is about 1.3 meters wide and 6-7 meters long. Ditch 30 cm wide and 10-15 cm deep between the rafters and rafts are connected to the drainage ditch to facilitate drainage.
Seedling management: After planting, put on the shade shed in time, use the sunshade net and plastic film to make a small arch shed, prevent rainstorm and prevent exposure. However, the cover film should not be covered tightly, and it should be 20-30 cm away from the ground to facilitate ventilation and cooling to prevent baking. After emergence, the sunshade net should be uncovered on time, usually on a sunny day at around 10 am. It will be unveiled at around 4 pm, and it will not be covered on cloudy days. When the shower is raining, the film will be temporarily covered, and the time for shading will be gradually reduced. Until a few days before planting, it will not be covered at all. When the seedlings are watered, the humus fine soil is thinly covered 1-2 times in the rhizosphere of the seedlings to avoid the roots from being exposed and lodging, and the soil temperature can be lowered, and the microclimate can be adjusted. In the seedling stage, depending on the growth of the seedlings, the 1-2 times of thin human excrement or urea should be applied. If the fertilizer is topdressed with urea, the water should be poured immediately after the top dressing, and the fertilizer stained on the leaves should be washed away.
Field cultivation and management
Preparation before planting: Select the field where the soil is fertile and can be irrigated, and avoid planting or re-cultivating with cruciferous vegetables, otherwise the pests and diseases are heavier. According to the width of the furrow 20 cm, the ground is 1 m wide and 10 m long, and the planting hole is opened. The row spacing is about 40 cm and the plant spacing is 40 cm.
Colonization: Due to the early maturing varieties planted in the summer, the whole growth period is in a high temperature environment, the plants grow faster, it is easy to bloom early, and the seedling age should be strictly controlled in about 20 days. When the seedlings grow to 4-5 leaves, water the day before planting so that they can be pocketed when planting. In order to avoid the seedlings that have just been planted being damaged by noon glare and high temperature, it is suitable to colonize on cloudy or evening. When the seedlings are to be made, the soil will not be scattered, and the roots will not be damaged. Watering immediately after planting. It should be watered every day for 2-3 days after planting in the drought to reduce the seedlings.
Field management: After the seedlings are slowed down, the first topdressing is carried out, and 15 kg of ammonium sulfate or 10 kg of urea is applied per mu, and watering is carried out to promote the growth of rosette leaves. After pouring water twice, cultivate once. After about 7 days, the second top dressing is applied, 15-20 kg of compound fertilizer per acre (45% nitrogen, phosphorus, potassium compound fertilizer), followed by watering, and then apply 1-2 times of thin fertilizer depending on the growth of the plant.
Wear leaf protection: When the flower ball grows to 7-8 cm, use the leaf protection method to protect the flower ball, that is, stack the outer leaves, wear it with a bamboo stick, cover the flower ball, and ensure the flower ball. White color, improve the quality of the flower ball.
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