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Spring cultivation techniques of broccoli
1. Choose a good seed: Choose early-maturing or early-maturing varieties that are not sensitive to low temperatures in the early stages of growth. Such as the Green Ridge, Green Ridge and so on. 2. Timely sowing: The sowing date is determined according to the different cultivation forms. The cultivation of small arch sheds is sown from late December to mid-January, the seedling age is 50-60 days, the harvesting period is from late April to late May, and the mulching cultivation is in January. Sowing from late to early February, seedling age 45 days, harvesting from May to early June; open field cultivation from mid-February to early March, seedling age 30-40 days, harvest from early May to mid-June . 3. Cultivate strong seedlings: Use seedbed nursery or greenhouse insulation seedlings, 15-20 days after sowing, a true leaflet of the seedlings is spread and transferred to the seedlings. The night temperature is maintained above 12°C and the daytime temperature cannot exceed 30°C. 4. Colonization: before cultivating and cultivating before planting, apply sufficient basal fertilizer, apply 3,000 kg of fertilizer per mu and 30 kg of compound fertilizer. Made of 1.4 meters (even ditch) wide, deep ditch sorghum, 2-3 days before planting mulch to increase soil temperature. When the seedlings have 5-6 true leaves, they can be planted and planted in double rows with a spacing of 50 cm, a plant spacing of 40 cm and 3000 plants per acre. 5. Field management: (1) Temperature management, planted before the end of February, due to the low temperature at that time, it was necessary to cover a small shed to increase the temperature and promote the early growth of the plants; when the temperature rises, attention should be paid to ventilation, so that small The maximum temperature in the arch shed does not exceed 30°C. By late March and early April, when the plants are large, small arch shelters should be removed in time. (2) Dressing: Planting and pouring? Fertilizer, promote seedlings. During the budding period top dressing? Fertilizer, promote the development of buds, generally Urea 10-15 kilograms of urea, with 15 kg of compound fertilizer. For both top and side flower bulbs, after the top flower bulb is harvested, topdressing once again can use urea and apply about 15 kg of mu. (3) Pest control: The main disease is downy mildew, which can be sprayed with 75% chlorothalonil 1000 times or 70% thiophanate 800 times spray; the main insect pests are cabbage caterpillar, diamondback moth and aphid, and 20% fenvalerate can be used. Emulsion 2000 times or 2.5% of the enemy killing EC 2000-3000 spray control, aphids can be a net 1500 times liquid spray control. 6. Harvest: The harvest period of broccoli is short and must be harvested in time. When you touch the flower bulb with a flower bud to start? The sensation of moving, or the flower buds on the edge of the flower ball slightly? Scattered time is suitable for harvesting. The bulbs are usually cut together with 10-15 cm long fleshy stems with a sharp knife. For example, collect the flower bulbs and remove the plants after one harvest. If you want to harvest the side branch, take care to reduce the damage to the leaves.