The planting technology of three-film potato in greenhouse in winter has high yield, early listing and good benefit.

Construction shed: the loose soil land is selected for the construction of large arch shed and small arch shed. Fertilization of cultivated land: deep ploughing and reasonable fertilization before planting. Varieties: precocious varieties with short dormancy period should be selected. Seed selection and soaking: it is appropriate to choose small potatoes or large potatoes cut into pieces, soak and sprout before sowing, wait for buds to grow before planting. Sowing: about 5000 plants per mu were planted in late December to complete three-film mulching. Field management: pay attention to temperature and humidity, fertilization, watering and pest control.

Winter greenhouse three film refers to the big arch greenhouse, small arch shed and plastic film. Winter greenhouse three film potatoes generally sprout and sow in December, and can be harvested at the end of March of the second year. The yield per mu can be as high as 7000-8000 jin. The time on the market will be about a month earlier than the planting method of plastic film mulching potatoes in early spring, and the economic benefits are considerable. The following introduces the specific winter greenhouse three-film potato planting technology.

I. specifications for site selection and construction of shed

Firstly, the land with loose soil, sufficient water and good drainage and irrigation is selected to build the shed. The length, width and height of the big arch shed are about 60m, 6m and 2-2.5m, respectively. Two small arch sheds with a height of about 0.8m-1.2m and a width of about 2.40m are built in the big arch shed. The distance between the small arch shed and the big arch shed is 35cm, and the distance between the two small arch sheds is 50cm, which can be used as a walkway and convenient for later management.

II. Planting specifications

The area is delineated in each small arch shed, and each planting area is about 2.4 meters. The cultivated land can be planted in four ridges.

III. Fertilization of cultivated land

The greenhouse plot is generally ploughed deeply about 20-25cm, and the soil is leveled and raked fine, and combined with land preparation, about 4000 jin of mature organic fertilizer, 40 jin of diammonium phosphate and 400-500jin of plant ash are applied per mu.

IV. Selection of varieties

In the selection of varieties of potatoes planted with three-film in greenhouse in winter, it is suitable to choose early-maturing varieties with short dormancy period, early fruit and strong rot resistance. For example: Kexin 13, Luyin 1 and other varieties.

5. Seed selection and soaking

1, seed selection: sowing is suitable to choose about 100 jin of small potatoes, so that after sowing will not be easy to rot, and the growth is more exuberant, you can also choose large potato pieces for sowing.

2. Soaking: about 15-20 days before sowing, the potatoes to be sowed are placed in 0.01% gibberellin solution, soaked for about 3-5 minutes, then fished out and dried and placed in a 15-18 ℃ hotbed to accelerate sprouting, maintaining 60% of 70% air humidity, and the buds grow to 1-1.5cm after 20 days.

VI. Sowing at the right time

1, sowing time: winter three-film planting potatoes can be carried out in late December, after the sowing potatoes sprouted, choose sunny and windless weather to sow.

2. Sowing density: because most of the potatoes are planted with three-film mulching in winter, about 5000 plants can be planted per mu, and the row spacing is between 60cm × 18-20cm.

3. Sowing method: when sowing, the soil is leveled and raked fine, and each border is ditched according to the row spacing 60cm, and the ditch depth is about 3cm. After opening the ditch, pour a small amount of water in the ditch, then sow according to the plant spacing of 18-20cm, ridge and cover the 8cm soil after sowing, and then cover it with plastic film, and finally cover the small arch shed, so that the three-film mulching is completed.

VII. Field management

1. Temperature and humidity: as the weather is relatively cold when sowing, the temperature in the shed should be kept at about 18-20 ℃ during the day and 10-15 ℃ at night, which is conducive to potato emergence. In case of cold and snowy weather, a small amount of grass can be covered outside the small arch shed to maintain the greenhouse temperature.

2. Fertilization: if there is a lack of fertilizer during the growth period, it can be combined with watering and apply about 10 jin of urea per mu.

3. Watering: during the growth period, the soil should be moist, and sufficient water should be ensured after the growth stage, which is beneficial to the growth of stems and leaves. When the soil is dry, furrow irrigation can be used to water in time. Due to the use of plastic film to cover potatoes, generally in the seedling top soil, it is necessary to timely cut the plastic film to promote potato emergence. When potatoes show buds, the buds should be removed and watered in time, which is beneficial to the growth and development of potatoes.

VIII. Control of diseases and insect pests

1. Early blight: 64% alum wettable powder 500 times solution can be used to control the disease, or Bordeaux solution 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

2. Late blight: 72% Kelou wettable powder 700-800 times can be used for prevention and control.

3. Aphids or other diseases: 50% omethoate 600 times solution can be used to control.

IX. Timely harvest

But in late March, the plant leaves have been basically yellowed, and potatoes have been completely expanded, depending on the market situation for timely harvest, generally high-yield potatoes per mu about 7000-8000 jin.