Type: All-steel tube multi-span steel frame greenhouse. Materials: The vertical pole adopts hot-dip galvanized square pipe and cement column, and the horizontal pole and roof adopt hot-dip galvanized steel pipe. Specification: the height of the roof is 4.2-4.5m, the height of the side wall is 2.5-2.8m, the distance between the roof membrane and the crown is greater than 1m, and the arch distance of the greenhouse is 6m.

First, how to build a red citrus greenhouse?

1, greenhouse construction

(1) Type: all-steel pipe multi-span steel frame greenhouse.

(2) Material: the vertical pole adopts hot-dip galvanized square pipe and cement column, and the horizontal pole and roof adopt hot-dip galvanized steel pipe.

(3) Specification: the height of the greenhouse roof is 4.2-4.5m, the height of the side wall is 2.5-2.8m, the distance between the roof membrane and the crown should be kept above 1m, and the arch distance of the greenhouse is 6m.

2. Characteristics of all-steel tube multi-span steel greenhouse

(1) has few connecting clamps, good universality and interchangeability, and is beneficial to the convenient installation of steel frame greenhouses.

(2) The main components are treated by hot dip galvanizing, which prolongs the service life of the steel frame greenhouse.

(3) The shed shoulder is 3m high and the door is 1.2m wide, which can effectively improve the operation facilities in the shed and facilitate the mechanized operation in the shed.

(4) Simple structure and convenient operation, with a diaphragm mechanism and a film pressing line tensioning mechanism.

(5) Setting diagonal tie rods at both ends of the shed can improve the snow resistance of the shed.

Second, the cultivation techniques of red beauty citrus

1, cultivation techniques

(1) Orchard construction: The land should be fertile, the thickness of the soil layer should be above 50 cm, and the stone land should be avoided; Drainage should be smooth, and the groundwater level should not be higher than 60 cm; Water supply should be convenient and avoid low-lying land; Choose sunny south and winter south, and avoid in tuyere and strong wind plots; Avoid places that are easy to freeze; It must be a place where there is no history of ulcer, Huanglongbing, leaf pressing and atrophy.

(2) Improving the soil environment: when preparing the soil, apply sufficient base fertilizer with row spacing of 100 cm and depth of 70 cm, and turn weeds, compost, straws, sheep manure, microbial agents or bacterial fertilizers into the ditch, with an amount of15000-20000 kg per mu; Then cover the excavated soil for 90- 100 days, and then mix the soil with the matrix. When planting, dig a pit, and sprinkle lime or gypsum 200 kg per mu around the plug (gypsum is milder than quicklime).

(3) Selection of seedlings: virus-free seedlings with developed roots, strong growth and pure varieties are selected, virus-free container seedlings are the best, and virus-free or identified healthy parent trees are grafted with shoot tip micro-buds.

(4) Young tree planting: When planting, it should not be too deep or too shallow. Too deep will lead to the contact between soil and marriage interface, which will easily lead to the invasion of bacteria and root rot; Too shallow will lead to the root system can not fully contact the soil, can not quickly slow down the rooting of seedlings. When planting, it is best to mix the surrounding soil with sand to avoid damaging the root system when returning the soil.

2. Management technology

(1) shed room management

① Film mulching and film uncovering: Red Beauty citrus is not covered in summer, but only in winter and spring, and the time is generally 5438+ 10 in early June. In the early stage, only the top was covered with plastic film, and the side was covered with insect-proof net. When the cold air comes, it is completely covered. In case of severe low-temperature freezing injury, it is necessary to remove the side film or replace it with a sunshade net in time to prevent the rapid temperature rise in the greenhouse from causing secondary damage to the trees.

② Temperature control: In winter and spring, in case of extremely cold weather or continuous low temperature weather, heating equipment should be used to heat Dapeng to prevent frostbite; From flowering to young fruit, it is necessary to remove the top film to reduce the temperature and humidity of the tree and prevent the phenomenon of burning flowers and gray mold; Finally, the temperature difference should be increased during the discoloration period and the harvest period to promote the coloring of citrus fruits and improve the appearance and internal quality of fruits.

(2) Cultivation management

① Fertilization: Red Beauty Citrus is a hybrid variety of citrus, with good parthenocarpy and sustained high yield, so the demand for fertilizer and water is higher than that of conventional citrus. However, it is a contradiction that limited cultivation in protected land and excessive application of quick-acting fertilizer can easily lead to secondary salinization of soil, damage root system and aggravate tree decline. Therefore, in addition to topdressing as needed at key nodes such as spring shoot germination, fruit preservation in summer, fruit strengthening in autumn and fruit picking (medium and micro fertilizers are very important), compound microbial inoculum and organic fertilizer should be applied to combat the problem of soil degradation, and sea elf biostimulant should be sprayed at the peak of root growth to strengthen root activity and prevent premature aging.

② Moisture: Because there is no natural rainwater supply for greenhouse cultivation, it is necessary to maintain sufficient water supply during the growing period, and the water consumption will be significantly greater than that for open cultivation. It takes 3-5 days to spray water manually in summer. In the mature stage, soil is classified and managed according to its water-holding capacity. Orchards with good water retention capacity should be controlled 1.5 months before listing, and orchards with poor water retention capacity should be controlled 1 month before listing. Only when the leaves are curly and dry will the water be sprayed on the ground, and when the topsoil is wet, the water will stop.

3. Pruning, shaping and flower and fruit management

(1) When the crown of young trees does not reach more than 1.5m, comprehensive pruning and flower thinning should be combined with spring pruning to promote crown enlargement.

(2) The ratio of leaves to fruits should be controlled at 70-80: 1 in the early stage of production and at 50-60: 1 in the full fruit stage, so as to ensure the tree vigor and prevent the decline.

4, pest control

(1) Red Beauty Citrus has weak resistance to pests and diseases, and is prone to diseases such as seborrhea dermatosis, macular disease, brown rot, foot rot, gray mold, canker, anthracnose, soot disease, fruit sucking moth, scale insect, red spider, whitefly, liriomyza sativae and so on.

(2) During prevention and control, the interior of greenhouse facilities can be cleaned regularly, and the pruned branches and leaves of trees should be taken away from the park for centralized destruction.

(3) Control the facility environment in the greenhouse, ventilate and reduce humidity in flowering period, and reduce the occurrence of gray mold of Red Beauty citrus.

(4) Combining physical control or biological control, such as hanging yellow boards, using fly traps, placing artificial predatory mites, etc., can increase the control effect and effectively and reasonably reduce the use of pesticides.