How to grow asparagus in plastic greenhouse

First, the varieties suitable for planting in our province are big chicken yellow, big bone green, sword leaf, silk silk, big chicken green and so on.

Second, during the sowing period, greenhouse cultivation can basically be produced and supplied every year. In order to obtain higher economic benefits, sowing should be arranged from October to December and listed from December to March of the following year.

Third, the growth rate of asparagus is fast, the branching ability is strong, and it needs more fertilizer and water, so it is appropriate to apply sufficient basic fertilizer. Generally, 1500ml 2000 kg of mature organic fertilizer and 100 kg of plant ash are applied per mu, which is fully mixed with the soil to form a border (bag ditch) with a height of 20 cm and a width of 130 cm.

Fourth, the seed coat of seed soaking to accelerate germination is thick and hard, if sowed directly, it will germinate slowly due to low temperature, and if it is exposed to a long period of low temperature, overcast and rainy weather, it will cause seed rot, so it is appropriate to accelerate germination. Soak the seeds in warm water of about 30 ℃ for 20 hours, and then wrap them in a 30 ℃ germination box to accelerate germination. When the seeds are 50%, 60% white, sowing can be carried out.

Fifth, sowing hollow cabbage can be sown or strip sowed, the amount of seeds used per mu is 1.5ml 2.0kg, and after sowing, it is covered with fine soil, which is about 1cm thick. Strip sowing can draw a shallow trench 2mi 3cm deep on the border surface, with a distance of 15cm, then spread the seeds evenly in the ditch, cover it with fine soil, and then cover the border with a sunshade net, then sprinkle water, and after emergence, you can uncover the sunshade net.

VI. Management in the greenhouse

1. Management of temperature and humidity in greenhouse cultivation of asparagus in winter, the temperature is low, the humidity is high, and the continuous low temperature, overcast and rainy weather lasts for a long time, which is extremely disadvantageous to the growth of temperature-loving asparagus, so heat preservation and cold prevention is the key to out-of-season cultivation. After sowing, the greenhouse should be sealed in time to ensure that the temperature in the greenhouse is higher than 10 ℃, otherwise it will cause freezing damage. At the same time, when the sun is sufficient and the temperature is high, ventilation and moisture drainage should be strengthened to avoid the temperature in the greenhouse above 35 ℃ as far as possible to prevent plant diseases so as to maintain the exuberant growth of plants and increase yield. The relative temperature of the air in the greenhouse may reach 100% in high humidity and rainy days, so the thin films at both ends or around the greenhouse must be opened in time for ventilation.

2. Water and fertilizer management asparagus is a crop harvested many times, so in addition to applying sufficient basic fertilizer, it is necessary to carry out many stages of topdressing in order to achieve high yield. at seedling stage, it can be applied with 10% rarefied manure and 15% rarefied manure and urine, and the dosage per mu is 1000 May. when the seedlings have 4 true leaves, they should be mixed with 1520 kg compound fertilizer and 4 kg urea. 8kg (per mu) of compound fertilizer was used for each harvest in the harvest period. Asparagus needs a lot of water and should be watered frequently to keep the soil moist.

3. The main diseases of pest control are seedling quenching disease and stem rot disease, which are caused by low temperature and high relative humidity. The occurrence of the disease can be reduced by reducing humidity, and it can be controlled by 700 times of Ruidushi or 800 times of carbendazim.

The main insect pests are mites and red spiders, which can be sprayed 1000 times or 1500 times with propargite.

4. Generally, it should be harvested in time when the plant of asparagus grows to 35 cm high after 35 minutes of sowing.