This technology was successfully researched by the Vegetable Research Institute of Nanjing Agricultural University in the early 1990s, and it is mainly applicable to the Jianghuai and southern temperate marginal areas. The main measures are to cultivate strong-rooted plants in autumn and harvest young stems in the early stage of spring germination. After the temperature rises and stabilizes in the first half of May, 2-3 stems are left as "mother stems" for them to grow to 70-80 cm in height to prevent lodging. Using the photosynthetic nutrition of the "mother stem", the bamboo picking period can be ended from June. The specific operation is as follows:

Clean countryside

From February 65438 to February of the following year, the residual plants were uprooted, the branches and leaves were swept away, the source of the disease was cut off, and the source of the disease was destroyed by centralized burning.

(2) Soil cultivation

From mid-late March to early April, when the daily average temperature reaches 10℃, the soil should be cultivated by stages in combination with intertillage and topdressing, for example, picking white asparagus to cultivate a ridge with a height of 30 cm, and picking green asparagus to cultivate a ridge with a height of 10 cm.

(3) Fertilization

Before cultivating the soil, we should apply germination accelerating fertilizer in March-April, and apply compound fertilizer of 25 kg, calcium superphosphate 10 ~ 15 kg, potassium chloride 15 kg, decomposed human manure 1000 kg or urea 15 kg. From April to July, bamboo shoots are harvested. According to the growth situation, the bamboo shoots are topdressing once every 3-4 weeks, and urea 10- 15 kg, potassium chloride 5- 10 kg and calcium superphosphate 5- 10 kg are applied at each point. After picking bamboo shoots in the middle and late July, level the high ridges, remove the stubble of tender stems and part of mother stems, remove weeds, dry the roots in the sun for a few days, apply topdressing on both sides of the ridges, apply 50 kilograms of cake fertilizer at 67㎡ and 2000 kilograms of decomposed compost to restore plant growth. When the new stems in autumn grow to 30 cm, all the mother stems left in spring and summer are cut and burned. Combined with Qingyuan's February 65438,667m2, 2,500kg of decomposed organic fertilizer, 20kg of calcium superphosphate, 200kg of plant ash and human excrement1500kg were applied.

(4) intertillage weeding, irrigation and drainage

Plough in time after the rain to keep the soil loose. Attention should be paid to drainage and intertillage weeding in high temperature season, and the soil should not be deprived of oxygen, so as not to affect the root activity. Keep enough water in the harvest period to make the tender stems grow fast and strong.

(5) topping and thinning

When the new stems grow to 1 ~ 1.2 meters in autumn, topping should be carried out to make the stems stout and prevent lodging. And thinning out excessive weak branches and diseased branches.

(6) selecting and retaining the mother stem

Because the first time the temperature is low, the growth is slow, and the stems are tender, they are usually removed. When the temperature of the second batch of tender stems is high after growth, it is generally from mid-March to early April in the south and from late February to early March in South China. A certain number of mother stems are selected in combination with garden cleaning work. The diameter of the remaining mother stem should be 1 ~ 1.2 cm, free from plant diseases and insect pests, straight and unbending. The number of female stems varies with the age of plants. The older the plant is, the more the underground stem branches, and there is a natural branching phenomenon. Therefore, there are more stems with female stems, and they should be evenly distributed in all directions. 2-3 annual plants, 3-4 annual plants and 4-5 annual plants are reserved for 65438+2. The remaining mother stems should be evenly spaced, with a certain interval in the middle, generally 7 ~ 10 cm. The older you get, the greater the interval, so as to ensure ventilation and light transmission and facilitate harvesting. Because the life of the mother stem is generally 100 ~ 120 days, it is necessary to replace the mother stem in time in about 4 months. Jiangsu and Zhejiang areas are generally replaced in July-early August.

(7) Field management of mother stem

After the mother stems are unearthed in early April, spraying 70% thiophanate methyl 700-800 times or using 40% carbendazim 500 times in time; Or spray the stems and leaves with120 200 times solution, or water the roots or coat the stems to prevent and control diseases such as stem blight, brown spot and Sclerotinia sclerotiorum. After the jia ye of the stem is unfolded, it should be piled up in time to prevent the stem from lodging. Generally, in early spring, a column with a height of 1.5 meters is erected every 2 meters, and thick lead wire is drawn at the height of 1 meter. Later, when the mother stem grew to the height of 1.2 meters, it was tied to the lead wire. Top the mother stem in time to dwarf the plant, promote the emergence of new branches and remove excessive side branches from the stem. If the stem is damaged, it should be saved in time to make up for it.