Key Cultivation Techniques of Green Bellflower

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1, fine preparation

Green stems planted in summer and early autumn are generally broadcast live, and green stems planted in autumn and winter are generally transplanted by nursery. Due to the small seeds of green stalks, seedbeds need to be intensively cultivated so that they can emerge neatly. In general, about 2000kg of farmyard manure with high quality and maturity is applied per acre seedbed, and no fertilizer is used as base fertilizer as much as possible, and no seedlings will be affected. After the application of base fertilizer, it can be used to make oysters. Normal summer and early autumn live seedbeds are used for 1m wide sorghum, while in autumn and winter, seedbeds can be arbitrarily determined according to the size of the plot.

2, sowing

In general, South China can sow four seasons, and in the middle and lower reaches of the Yangtze River, it is planted on the open ground from April to October. Green stems planted in the summer and early autumn seasons should be broadcast live. In order to save on seed use, on-demand methods can be used. The seedbeds were irrigated in the afternoon on the day before sowing, and a shallow ditch was lightly raked with bamboo rakes the next day. Each gap is about 15cm, and 2 to 3 seeds are sown every 15cm in the shallow trench, that is, the spacing of the rows is 15cm15cm. After sowing, the fine soil is covered, and the thickness is about 2 to 3 times the diameter of the seed. About 2 days to emerge. Due to the high temperature in the summer and the large amount of evaporation, timely watering should be done after the seedlings are raised to prevent water shortage. After 4 to 5 days, the leaves can be sprayed with 5% urea water. Every 5 to 7 days after the top dressing. In the autumn and winter, when the green stems are grown, the method of seedling transplanting is generally adopted, and the seedbeds are soaked with water before sowing, and sowing can be used for sowing. But to control the amount of seed, sowing should be uniform, so that there is sparse, cover fine soil after sowing, about 3 to 4 days after emergence. After emergence, the water should be treated with seedlings in a timely manner. After the true leaves are out, the leaves are sprayed with 5% urea water once every 7 to 10 days. After about 20 days, they can be transplanted. To prevent weeding, spray 72% of Dole herbicide 80 to 100 mL per 667 m2 after sowing.

3, colonization

Planted green stems in autumn and winter are usually planted at about 20 days old. The row spacing of the plant is 20cm20cm. After transplanting, the planting water is soaked. After about 1 week of easing, the root can be top-dressed once and then watered once again. The urea can be topdressed with about 20kg per mu.

3.1 Water Management

Seedling stage should be diligently watered to keep the soil moist, hot summer drought, cabbage root shallow, weak absorption capacity, during the growth should continue to supply fertilizer and water, to lightly poured, diligently pouring. Sunny day watering 1 or 2 times to keep the soil moist. According to "three cool" (day cool, cool, cool water) to determine the watering time, generally selected in the early morning and evening, the sooner in the morning the better, in the evening after pouring at 17:00, be careful when pouring watering So as not to knock down the seedlings.

3.2 Reasonable fertilization

Green stem must require large amounts of fertilizer, in addition to the use of basal fertilizer, it is necessary to make up the dressing in time, and topdressing nitrogenous fertilizer several times is an important measure to promote the growth of Chinese cabbage and ensure high yield; if nitrogen fertilizer is insufficient, the plant growth is slow, the leaves are few, and the base leaves are easy. Yellowish shedding. Fertilization can be carried out in combination with thinning and watering. After the first thinning, 10 to 15 kg of compound fertilizer is used for water per mu (350 to 409 compound fertilizer per 50 kg of water). After the seedling is set, 10 to 15 kg of compound fertilizer is used per mu. For the pouring of water, every time after pouring, the leaves should be washed with water, and the fertilizer should be poured in the early evening. In the middle and later periods, the fertilizer should be applied 1 to 2 times.

4, weeding weeding

Green stems live in summer and early autumn after emergence and time seedlings. 3 Leaves 1 seedlings are planted on the same time, and weeding and weeding are done in time. Prevent soil compaction. Eli seedlings grow rapidly. In the autumn and winter, when the green stems of Daejeon were moved into the fields, we must pay attention to timely cultivating and weeding and loosen the soil.

5. Pest control

5.1 Pest Control

The main pests are aphids, cabbage caterpillars, and diamondback moths. Control locusts. Can be used 25% ikashi 1000 times or 50% helium fog 2000 times liquid spray, or mu using 250 grams of scorpion smoke agent smoked, but also can be trapped with yellow armyworm board. Control cabbage Pieris, Plutella xylostella, can be sprayed with 2.5% vegetable Hi 1000 ~ 1500 times liquid or vegetable insects sweep light 1000 ~ 1500 times liquid.

5.2 Disease Prevention and Control

Focus on prevention of downy mildew, black spot, and anthrax. For downy mildew, biological control methods can be adopted, namely 250 g (juice) of water, 50 kg of water, pepper, ginger, and garlic, and 75% chlorothalonil wettable powder 600 times or 72.2% grammite. Ling wettable powder 600 times or 40% aluminum phosphate aluminum wettable powder 500 times liquid prevention; for black spot, the early onset can be used 50% carbendazim WP 600 times spray control. For anthracnose, it can be sprayed with 70% thiophanate-methyl WP 500-600 times or 80% anthraquinone dexamethasone 800 times.

5.3 Prevention of Adversity Injuries

The main cause of heat damage is heat damage. The symptom is that the leaves are malformed. The selection of heat-resistant varieties is an effective means to prevent heat damage. Secondly, in the hottest conditions, the spraying of water can reduce the temperature. Before and after noon, covering the shade net can also reduce the occurrence of heat damage.

6, timely harvest

The cabbage plants grow to a certain size and can be harvested at any time. The criteria for adult plant harvesting were as follows: the leaf color of the outer leaves began to fade, the outer leaves of the base yellowed, and the leafy stalks grew from strong growth to closed growth, and the heart leaves were elongated to be flush with the outer leaves. The summer harvesting period is generally 28 to 35 days. The best choice for harvesting is in the early morning or early evening in cool weather. The harvest should be covered in time to prevent dehydration and wilting and affect quality.

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