Cultivation techniques of overwintering cauliflower

Growing cauliflower in winter is a popular way to grow cauliflower these days. Do you know how to grow cauliflower in winter?

1. Cultivation techniques of winter cauliflower

1. Select good varieties

Cold-resistant and disease-resistant varieties should be selected for overwintering cauliflower. Generally, under the low temperature condition of 4~-12℃, no protective measures are needed to overwinter safely. At present, the relatively excellent varieties in the market include Donghua 240, Donghua overwintering king, Aoxue No.1, etc.

2. Seeding at the right time

According to the local climatic conditions and variety characteristics, the suitable sowing time should be selected. The reference sowing time in Henan Province is from July 25 to August 5. In other areas, the introduction and trial planting should be carried out before large-scale planting according to different soil conditions and climatic types. 667㎡ seedling planting seed quantity 25~45g, need seedbed 30㎡.

3. Cultivate strong seedlings

Three days after emergence, a single shade net or watering can be used from 10:00 a.m. to 4:00 p.m. every day to prevent sunburn. When the cotyledons of the seedlings are unfolded, shade may not be applied.

Pay attention to thinning seedlings. When the seedlings are one leaf and one heart, carry out the first thinning, the seedling spacing is 4 cm. When the seedlings are three leaves and one heart, the seedlings can be fixed, and the seedling spacing is 10 cm square.

During seedling growth, if it does not rain, water once a week, watering is not easy to be too large, if it rains heavily, seedling beds should be drained immediately to prevent flooding; if the soil is hardened, loosen the soil once with a small hoe; pull out weeds in time; in addition, pay special attention to the prevention and control of pests and diseases, generally once a week.

4, fine soil preparation, reasonable planting at the right time

Select the plot where cruciferous vegetables have not been planted in that year and irrigation is convenient, generally apply decomposed high-quality organic fertility 4000 - 5000 kg, nitrogen, phosphorus and potassium ternary compound fertilizer 100 kg, boron fertilizer 2 kg per 667 square meters, deeply cultivate 26 cm, level and thoroughly harrow, make ridges according to 100 cm double row spacing, and plant 2 rows of cauliflower at 3/1 height on both sides of the ridge.

The optimum planting time in Huanghuai area is late August, seedling age is 25~30 days, seedlings can be planted when they grow to 4~6 true leaves, planting row spacing is 60 cm, plant spacing is 50 cm, planting about 1800 - 2200 plants per 667 square meters.

5. Field management

(1) Watering: water immediately after planting, and then water again after 3 days. Watering depends on soil moisture content during growth, keep soil dry and wet, control water properly before winter, squat seedlings, make leaves dark green, stems thick, and irrigate frozen water in mid and late November, and irrigate enough to irrigate thoroughly; During winter, if there is no snow, the plant wilts, the lower leaves turn yellow, can be watered in the morning when the soil and plants thaw, water can be finished before 3 p.m., so that the ridge surface does not store water, spring weather should be watered early, after the ball should be watered once a week to ensure the growth needs of the flower ball, such as water shortage during the growth of the flower ball, the flower ball early scattered, low yield.

(2) Fertilization: after planting and slowing down seedlings, apply fertilizer once, 15kg urea per mu; before ridge sealing, apply fertilizer once, apply 50kg ammonium bicarbonate or 30kg urea per mu; when the weather turns warm in spring, apply urea 20kg per mu in combination with watering; no additional fertilizer can be applied during flower bulb growth.

(3) Intertillage weeding: autumn rain more, weeds grow fast, so to frequently weeding. After the seedling is slowed down, the first time of intertillage and weeding is carried out; before the plant is sealed, the second time of intertillage and weeding is carried out, which can be combined with intertillage to cultivate soil, and can be protected in winter.

(4) Root freezing: After closing the ridge, no more cultivation can be carried out, but if there are weeds, they should be removed in time.

The field management before winter depends on the growth of plants, ensuring that there are 15-18 leaves before winter in mid-November. And stem stout, dark green leaves, so that plants can safely winter.