(1) Seedling.

①Sowing amount. White asparagus per 667 meters 2 sowing 50 to 100 grams, green asparagus for 100 to 150 grams.

②The land fertilization. Select loose soil, good fertilizer conditions, permeable loam or sandy loam. Deep turn over about 30 cm, every 667 m 2 to apply 2000 ~ 3000 kg of base fertilizer, fertilizer turned into the soil, leveling the ground, do east-west border, border length 10 ~ 15 m, border width 1.2 m, ridge height 20 cm, rake the border.

③Sowing time. 5 cm soil layer temperature reaches 10 ℃ or more can be sown, can be nursed in the protected area, the seedling age of about 70 days can be planted, depending on the stubble, from spring to fall can be sown.

④Seed treatment. Asparagus seed skin thick and hard, outside the wax water absorption difficulties, so before sowing must be soaked to germinate. The method is: first cool water to bleach seeds, remove deflated seeds and insect-infested seeds. Then soak in warm water at about 30 ℃ for 2 to 3 days, change the water 2 to 3 times a day, the seeds fully absorb water, the water will be filtered, into the pot, at 20 to 25 ℃ for germination, 1 to 2 times a day with water to prevent rotting the seeds, when the seeds have about 10% of the germination can be sown.

⑤Sowing. Before sowing the need to irrigate the bottom of the moisture water, until the water seeps down, according to the plant row spacing 10 cm straight line, will be good germination seed single seed sowing in the planting position, covered with sifted fine dry soil 2 cm thick.

6 mulching. Immediately after sowing, cover the film, can increase the ground temperature to maintain humidity, favorable to the emergence of seedlings, but flush seedlings should be removed in time.

⑦ Seedling growth period should pay attention to the control of underground pests and so on.

(2) planting.

①Cultivation site selection. The requirements for the cultivation site are the same as the seedling site.

②To prepare the ground, digging planting ditches, fertilization. After clearing the garden, deep tilling and leveling, according to the white asparagus 1.8 meters, green asparagus 1.5 meters line spacing to play a straight line, along the line of digging planting grooves, ditch depth of 30 ~ 40 cm, 40 ~ 50 cm wide. The bottom of the ditch fertilizer, every 667 m 2 5000 kg of farmyard manure, diammonium phosphate 20 kg, the top of the cover to the ground from 7 to 10 cm can be planted.

3 planting time. Planting should be carried out in the dormant period, spring planting in March to April.

④Starting seedlings. Asparagus seedlings can be planted when the above-ground stems reach more than 3, and the seedlings should be lifted with a heap of soil to prevent injury to the roots. According to the 30 cm spacing, planted in the ditch, so that the root plate of the seedlings below the surface of the ditch 12 to 15 cm, the end of the bearing scale buds group, along the ditch in the same direction, in order to facilitate the cultivation of soil later. After covering the soil about 5 cm, cover the root plate a little pressure, so that the root plate and soil close connection. Then watering, after slowing down the seedlings, combined with medium plowing, and then mulching 2 times, each time 3 ~ 5 cm, so that the root plate buried in the soil under 10 ~ 15 cm.

(3) Field management.

①Watering. After the asparagus is planted and slowed down, watering should be done at the right time according to the moisture condition.

②Fertilizer. In mid-July and mid-August every 667 m2 of compound fertilizer 30 kg, fertilizer should be timely watering.

③ After watering in mid to late October, cultivate the soil 10 to 15 cm, moisture retention, heat preservation, in order to facilitate the safe overwintering of seedlings.

④Cultivate the soil. White asparagus must be in the spring of the second year after planting, young stems before pumping soil, so that the young stems soften. Cultivation of soil should be 10 to 15 days before the start of harvesting, 10 cm soil temperature of 10 ℃ or more. Too early, because the soil temperature rises slowly out of the shoots late; too late, some of the young stems have come out of the soil, meet the light discoloration. Cultivation of soil should be selected on a sunny day when the soil is moderately dry and wet, cultivated into the width of the soil ridge should be large, the thickness of the underground stems to be buried in the soil under the 25 ~ 30 cm shall prevail.

Green asparagus does not need to cultivate the soil before harvesting, underground stems above the soil layer of 15 centimeters can be.

(4) Harvesting.

①The asparagus planted in the spring of the previous year can be harvested for about 40 days of spring asparagus, and then each plant is left 3 mother stems to grow, and then the shoots continue to be harvested for about 30 days of summer asparagus.

②The previous summer planting of asparagus, the next spring each plant to stay 3 to 4 mother stems, and then start harvesting bamboo shoots 50 to 60 days.

③Adult asparagus field, generally spring first harvest 60 days of spring asparagus, in mid-June each plant to stay 2 to 3 mother stems for growth, the rest of the shoots continue to be harvested until early August, stop harvesting.

④After the general harvesting is over, there should be a growing period of about 3 months in order to make enough nutrients for the second year's bamboo shoot harvesting. During the nutrient growth period, fertilization management and pest control should be strengthened.

⑤Harvesting method. White asparagus is harvested and cut once a day in the morning and evening, and when you find cracks or moist circles on the soil surface, you can locate and harvest the bamboo shoots, dig straight down and cut them at 17 to 18 centimeters without hurting the underground stems and bulbs, and then fill the holes with soil after harvesting. The products are immediately boxed, covered with moist black cloth to prevent the young shoots from turning green in the light.

Green asparagus is generally harvested in the morning, will be as high as 21 ~ 24 cm of young stems Qi soil surface or in the ground 1 ~ 2 cm cut off. When the temperature is high, harvested twice a day, to prevent the shoots loose, tissue aging.

(5) timely control of pests and diseases. The common diseases of asparagus are: stem blight, root rot, blight, botrytis, brown spot disease and so on. Pests are: aphids, thrips, underground pests and so on.