The growth period of asparagus in greenhouses planted with plastic film will be prolonged, and the production of asparagus in the greenhouse will be greatly increased by using the asparagus secondary retention stems for three times. Cultivation of asparagus in greenhouses can also reduce the occurrence of pests such as stem blight and Spodoptera litura, thereby reducing the amount of pesticides and achieving high yield, high quality, low pollution and high economic efficiency.

1. Winter growth of asparagus in greenhouse

In the late part of 1.1, the greenhouse was completely covered to prolong the growth period of the asparagus and increase the nutrient accumulation in the underground. After the plant is brown in late December, a thorough clearing will be carried out. After the second year of January, the mulch will be covered with water. The temperature in the greenhouse will be controlled at 28 - 32 °C before the germination, and the temperature will be 20 - 25 after the germination. °C, the nighttime insulation temperature is not lower than 5 °C.

2. Spring shoots

Asparagus in the greenhouse is generally in January, the temperature in the shed rises to 28 - 32 °C during the day, and the spring bamboo shoots begin to unearth when the night temperature is not lower than 5 °C. At this time, the temperature is higher during the day and the temperature is lower at night. Pay attention to the insulation at night. Asparagus shoots require a relatively high temperature for elongation. From germination to harvesting, it is 8 days at around 15 °C, and only 4 days at 20 °C. Therefore, the early low temperature production rises slowly, but in the case of not being affected by the freezing damage, the quality of the tender stem is high and the head is tightly packed and the sugar content is high. The peak of harvest occurs when the average daily temperature rises to 22 °C. In order to improve the quality, it is necessary to strengthen the management of ventilation and cooling, and to increase the number of harvesting per day. At the same time, the fine stalks, frostbite and other undesirable stems and side buds on the wreckage should be removed early.

Spring asparagus shoots can be harvested for 40-60 days depending on the previous year's growth. The yield per mu can reach 150-250 kg, and each plant can harvest 5-8. At this time, the price of asparagus during the New Year's Day and the Spring Festival is high.

3. Stop mining and keep the mother stem

When the average daily weight of the harvested asparagus stems is significantly reduced, the mother stems should be stopped in time. Excessive harvesting of asparagus in spring will affect the recovery of asparagus and even cause the death of asparagus plants. At the end of March and the beginning of April, the clearing garden will be carried out first, and the branches with a diameter of more than 1 cm will be selected and kept as the spring mother stems, usually 3-5 stems per plant. In the middle and late April, the application of fertilizer increased to promote the growth of mother stems. In late May, the temperature rises, and the greenhouse is only removed from the mask around the apical membrane. The insect-resistant net is used to ensure that the asparagus avoids rain and reduces the incidence of stem blight.

4. Take the mother stem and shoot the bamboo shoots

In the mother growing period, 10-15 kg of organic compound fertilizer should be applied every 15-20 days, and drip irrigation should be carried out in combination with fertilization. In about 30 days, the number of stems per plant reached 3-5, and the fertility index reached 1500-2000. At this time, the new shoots began to take the mother stems. According to the growth of asparagus, the bamboo shoots can last from the end of July to the middle of August.

July is the main occurrence period of pests and diseases. The attractants are used to trap pests to solve the problem of pesticide residues in asparagus, so as to achieve quality, safety and quality.

5. Summer Qingyuan change head

After 4 months of mother stem growth and mother stalk harvesting, most of the plants have begun to age, and some have already experienced a sharp decline in the viability of infected diseases. The growth period of the asparagus in the greenhouse can be more than 300 days. In order to vigorously grow the asparagus in the second half of the year, the summer clearing of the garden will be taken in the middle of August, and the yellow spring stalks will be cleared and thoroughly cleared. At the same time, carbendazim 200-300 times solution soil was used for disinfection, and organic fertilizer was added to fertilize for fertilization. After the new stems are unearthed, the stems are more than 0.8 cm thick and more than 1 m high. The evenly distributed branches are reserved for the autumn female stems, and the number of retained roots is 10-15 per plant.

6. Autumn shoots

The autumn compound stems should be re-applied with organic compound base fertilizer at the beginning of the period, and the foliar fertilizer should be sprayed every 7-10 days in the middle and late stages and watered. In autumn, pests and insects can be killed by insecticidal lamps and sex attractors. Beginning in mid-September, it will enter the harvest period of autumn bamboo shoots, and harvesting of autumn bamboo shoots can last for 30-40 days.

7. Winter before the Qingyuan

The asparagus, which has been vegetatively grown in summer and autumn, enters the dormant period in the middle and late November. After the asparagus leaves are yellow, it is poured through the water. After removing the straw from the ground, the soil is thoroughly disinfected with carbendazim 200-300 times, and the organic fertilizer is added. The film shed is insulated.

The use of asparagus secondary retention stems for three times to collect bamboo shoots to balance the growth of asparagus and extend the harvest period, so as to achieve high yield, high quality and economic benefits.

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