Several measures to promote yield increase in shed cultivation

1. Shed type structures are plausible.Shed types should be rationally selected based on local climatic conditions, cultivation season, production level, and economic basis, and the tilt of the greenhouse shelter top surface to the floor should not be less than 25 ◦ C, which is one of the key measures to ensure a high yield of big shed vegetables.

2. Choose a superior vegetable variety.Big shed vegetable cultivation, for which the requirements for cultivars are relatively strict.Winter warm shelter cultivars cucumber, to be selected for a low-temperature, low light tolerant variety;Spring sheds for cultivation of winter stubble vegetables, we should select cultivars that are tolerant to low temperature, low light, early maturation and can adapt to the high temperature environment, disease resistance and abundance later in life;Sheds are delayed in cultivation, with cultivars selected for being pre heat, disease and post chilling tolerant, and for which results are more concentrated.

3. Choose a drop free mist film.A thin film without flowing droplets and excessive mist can reduce the light transmittance by 20% - 30%, in addition to making the crop inadequately exposed to light, but also dripping water beads and mist will increase the incidence of crop diseases and diseases, causing problems such as not sitting fruit, dead seedling, and greatly reducing the yield and quality of vegetables.

4. Use a scientific irrigation regime.Based on the construction characteristics of the shed, a microdrip irrigation regime can reduce the relative humidity of the air in the shed by about 20% and will effectively control the greenhouse in the shed, maintain the ground temperature, reduce the occurrence of crop diseases and pests and weed growth, provide a survival and growth environment for the shed crops and promote precocious crop abundance.

5. Maintaining light transmittance of the shed film.The film product with the better light transmission was chosen, and care was taken during use to routinely sweep the film shed and maintain the light transmission of the shed film.Guarantee sufficient light source for crop photosynthesis.

6. Hang counter screens.When stitched into 2 - μ m wide and 3 - μ m-long counter screens using polyester aluminized coatings, hung on the upper end of a plastic shelter rear post and hanging down to the floor, the floor was lightened by 40% - 43%, and the shed temperature was increased by 3-4 ° C and 1.8-2.9 ° C, respectively;20% - 25% yield in cucumber;Tomatoes yielded a yield of 41.8% - 58.1%, which was also improved in quality.

7. Multi layer coverage.Multi layer coverage is an effective measure to prevent freezing injury.Observation statistics the housing of small arch sheds in a plastic shelter, which increased the air temperature in the small arch shed by 2-4 ° C and the ground temperature by 1-2 ° C;Made into two tentacles from plastic film in the shelter, it was covered at night so that the air temperature and the ground temperature in the shed were on average 1-2 ° C, and one 1-2 ° C grass cover was covered at four weeks of the shelter.

8. Promote techniques for grafting nursery cultivation.Big shed vegetables employ graft ‐ based seedlings, which can overcome many problems of stubble cultivation and prevent root patho ‐ genesis, and can effectively promote root development and improve the ability of root systems to tolerate low temperatures, thereby enhancing plant disease resistance.According to statistics, the control effect of grafted seedlings on cucumber wilt disease was generally above 90%, and the total yield could be improved by more than 20% compared with that from root seedlings.

9. Application of stimulator.高通过药物剂细胞了谢药物和药放.Generally, it can increase the crop up to 10% - 15%.Methods used are seed dressing, moistening onto the roots of seedlings, spraying;The amounts of Mu were 10 g of wettable powder, 20-25 g, 10 g

10. Application of rare earths.Rare earths have the effect of promoting root germination, increasing chlorophyll content, promoting nutrient supply to fruit organs, and improving crop yield using: seed dressing with 2 g of rare earths per kg;0.03% - 0.05% solution immersion;Spray: 25-30 g / mu, add 50 L water, rice vinegar 75 g, spray 2 times.

11. Promote stereologic implant techniques.Plastic sheds are costly to construct and fully utilize the sheds space for Stereocultivation, which can significantly improve yield and benefits the sheds Stereocultivation can be carried out according to the growth and development characteristics of different vegetables, the early and late reproductive stages of stubble vegetables before and after the use, the poor space for plant height and short stature, the poor root distribution hierarchy and the different ecological requirements of vegetables for environmental conditions,Staggered cultivation and stratified cultivation were carried out, so that it cultivated multiple vegetables on a certain land area for a high-yield purpose.Such as hanging pot cucumber, multi bridged alliin seedlings, cucumber lariat pepper and so on.