Green Asparagus Cultivation Technique in Greenhouse

Green asparagus is famous for its rich nutrition and medicinal value, and it is listed as one of the top ten famous dishes in the world. In recent years, Yifeng Agricultural Research Institute in Hejian City, Hebei Province conducted a pilot study on the high-yielding cultivation of Mount Munsun and obtained successful technical experience. The summary is as follows.

First, establish a high standard greenhouse

Choose leeward sunny, flat terrain, fertile soil, thick plough layer, convenient irrigation and drainage, well ventilated sandy soil plots to build a shed. The shed is best for lighting 5 degrees north and south. The greenhouses are 50 meters long and 8.2 meters long. The back wall is 2 meters high. The walls are 1.2 meters wide and low. The width of the top is 0.9 meters. The ridges are 3 meters high. The rear slope uses 20 cm thick corn stalks or wheat straw sandwiched between two membranes. Cover a 45 cm thick soil, cover the front slope with polyethylene without drip film, dig a 70 cm*70 cm cold ditch in front of the shed, fill with corn stalks or wheat straw.

Second, cultivation technology

1, species selection. Green asparagus should be selected cold-resistant, disease-resistant, scales cohesion, tender stem green and thicker and more uniform hybrids.

2, soaking in warm water. Before sowing, it can be soaked in warm water of 45-50°C for 30 minutes, then replaced with clear well water and soaked for 24 hours, then drained, rinsed once with warm water at 30°C, and placed on the temperature of 25-30°C for germination. Every morning and evening, rinse with warm water of 30°C once, and then wash away seed surface secretions to prevent mildew. When the seed germination rate reaches 15% (the germination is broken shell dew-white degree), it can be sown.

3, sowing. In early March, a small shed was used to raise seedlings. Seed beds per acre shed use 1.5 meters * 10 meters seedbed two each seedbed applied 2.5 kg of diammonium phosphate, 1.5 kg of potassium chloride, and then turned to 20 cm, the seedbed leveling, thinning. The first 10 cm row spacing ditch, ditch depth 5 cm, and then by 10 cm spacing from the plant, a seed per hole, about 3 cm soil cover, sprinkle 1605 with bed wheat bran bait, eliminate the underground pests. Then the small arch sheds are covered with a layer of plastic film, and the cover is tightly sealed. Generally no seedlings are released.

4, seedbed management. Because the asparagus seeds can germinate at temperatures above 10°C, the maximum temperature is 25-30°C. The greenhouse temperature is still low when the seedlings are planted. When 60% of seedlings grow in top soil, they should remove the mulch in time. After the seedlings are out, they are released. The air should be covered after 11:00 am and 2:00 pm. The air outlet is small to large. As the bamboo shoots grew up, they finally opened the film. The seedling temperature during the day is best controlled at 20 ~ 25 °C, at night to maintain about 18 °C appropriate.

5, planting. In early June, when the seedling height is 50 cm, 3 to 6 roots, and 3 shoots can be planted. The colonized bamboo shoots should be sorted and sorted according to size, and the sprouting surface of the asparagus root plate should be directed to the south during transplanting. Before planting, remove the fallen leaves of the former recommended crop to prevent the occurrence of diseases and insect pests in the shed. Applying basal fertilizer, generally more than 7500 kg of fertilizer per acre Shinong, 50 ~ 70 kg of compound fertilizer, 20 kg of urea, 30 kg of potassium chloride. And plough the soil 20 cm deep and level it. From the side of the greenhouse in accordance with the north and south to open the ditch, ditch depth of 10 cm, the ditch in the net and the ground fungus net bacteriophage net each 3 kilograms, dope dosing, you can follow the spacing of 90 cm * 30 cm colonization. After planting, it is required to cover the soil for 3 to 5 centimeters for the first time. It is advisable to wait for the second time after 7 to 8 days of easing seedlings to cover the same depth of soil as the original seedlings. After the first soil covering, it should be irrigated.

6. Management after planting. In the first month after planting, seedlings should be checked for seedlings in a timely manner, and the dead seedlings should be promptly planted in a timely manner. The replacement seedlings should be larger than the original seedlings. After the seedlings are planted, tender stems will be drawn out in 7-8 days. Because the seedlings are tender and tender, the resistance to diseases and insect pests and the regenerative power are very poor. It is necessary to check in time and find that stem blight is spraying 800 times 50% carbendazim in time and finds insect pests. Timely spraying control. One month after planting, the young shoots of the seedlings have been drawn 4 to 5 centimeters high. To promote its growth and development, sufficient water and nutrients must be given, and then quick-acting fertilizers can be pursued. Urea 10 to 15 kilograms per mu, or ternary compound Fertilizer 15-20 kg. Before and after August 25th, the asparagus entered the stage of autumn growth, and then ditched and chased farmyard manure 3000-4000 kg, 10 kg of diammonium phosphate, 15 kg of potassium chloride and 40 kg of ternary compound fertilizer. Before and after October 25, the asparagus stalks were cut off, and the fallen leaves were completely removed, brought out of the shed and burned. Then cultivating loose soil, chasing the ternary compound fertilizer 40 to 50 kg, 20 kg of urea. In mid-November, pour water once, combined with cultivator loose soil, net of ground insects and net of 4 kg of ground fungus, and turn the ridge into fish-like shape and cover with mulch. In mid-December, the evening grass is covered with grasshoppers, so that the temperature inside the shed is 20 to 28°C during the day and 18 to 20°C at night.

7, harvest. When the top of the soil is tender, timely break the film and put the seedlings. When the tender stem grows to a height of 20 cm, cut it with a sharp knife. The picked asparagus is put into the picking box. After harvesting, the tender stems are sorted, sorted and bundled, packed, and sold with a damp cloth. They can be temporarily stored in a cool place, and must not be soaked in water to avoid spoilage.

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