Current strawberry production management opinions

There have been many sunny days in recent days. Except for anthracnose and rhizome pitting disease, which caused serious shortage of trees in some greenhouses, the strawberry growth was generally smooth, and the first inflorescence mature picking period was about 10 days earlier than in previous years. At present, the first strawberry inflorescence fruit will be harvested, the second inflorescence fruit will expand and mature, and the third inflorescence will be budding. The occurrence of diseases and insect pests is relatively light, but a small amount of gray mold has occurred. Localities should reasonably arrange production and management according to weather changes and plant conditions, and pay particular attention to green ecological prevention and control of diseases and insect pests to ensure strawberry quality and safety. The following measures are recommended from January to February:

Greenhouse management

1. Scientifically manage the temperature and humidity of the greenhouse. In order to promote leaf photosynthesis and increase fruit quality and yield, it is required to maintain the day temperature in the shed at 15℃-27℃ and the night temperature at 5℃-8℃. During the third inflorescence flowering period, the shed temperature can be appropriately increased to promote pollination and fertilization. . Refurbish the surrounding ditches in time to prevent rainwater from ingress and accumulation of water in borders, strengthen drainage and ventilation, reduce humidity in the shed, and reduce disease conditions. Try to control the relative humidity in the shed below 60%. Under normal circumstances, humidity control is the priority in rainy days and ventilation is the priority; in sunny and cold weather, the temperature in the shed is the priority.

2. Pay close attention to weather changes to prevent freezing damage. When the lowest night temperature in the shed is below 5℃, the inner membrane must be covered. When the temperature is below 0℃, multi-layer covering and insulation measures such as two-layer membrane and small arch shed should be adopted.

3. In the case that the second film in the shed is thick, it must be removed in the morning to improve the light conditions and avoid covering the inner film for a long time to increase the temperature in the shed, resulting in insufficient light in the shed, causing excessive plant growth and yield Adverse effects such as deterioration of quality.

Plant management

1. Clean up diseased fruits and leaves in time, and remove old leaves, diseased leaves, diseased fruits, etc. removed from the garden in time to prevent the spread of pathogens and insects and keep the garden clean.

2. Eliminate small-shaped flowers, short stalks, poorly enlarged and deformed fruits, and retain fruits according to local market demand. Generally, 3 to 7 fruits are retained for each inflorescence. In winter, when the temperature is low, the leaf emergence speed slows down. It is not advisable to over-remove the leaves and keep as many functional leaves as possible.

3. Pay attention to the concentrated flowering date of the third inflorescence, avoid medication during the full bloom period, appropriately increase the shed temperature, promote pollen germination, reduce deformed fruits, and check the bees. If the number of bees is insufficient, adjust and supplement in time.

Fertilizer management

Drip irrigation should be used for top dressing. Generally, high-potassium fertilizer is applied at noon in fine weather, and the concentration is controlled within 0.4%. A small amount of water and fertilizer are irrigated with drip irrigation pipes for several times. Combined with spraying, foliar fertilizer or 0.2% liquid fertilizer can be applied to supplement the micronutrient elements.

Fruit harvest

Insist on complete harvesting and use clean harvesting equipment. When harvesting, it is required that the fruit stalk is short, does not damage the sepals and the surface of the fruit, minimizes mechanical damage, has no diseases and insects, standardizes the classification and grading, packs in time to avoid secondary pollution, and pays attention to handling when transporting.

Green prevention and control of pests and diseases

1. In order to ensure the high yield and quality safety of strawberries, agronomic measures and biological control should be strengthened, and the use of chemical pesticides should be minimized.

2. In winter, almost no pests occurred. However, the temperature this season is more frequent than usual. When picking fruits or sorting plants, pay attention to the early occurrence of Tetranychus urticae, aphids, and powdery mildew. If necessary, spray pesticides on sunny days for prevention and control, and strictly control the safety interval. The main cause of gray mold is continuous rainy days. Ventilation and lower humidity in the shed should be emphasized in management to reduce the occurrence of the disease. To prevent and control Tetranychus urticae, predatory mites can be placed.

Precautions

1. Strawberry is continuously harvested berries. In the process of preventing and controlling diseases and insect pests, pesticides should be used scientifically and rationally to avoid phytotoxicity. Excessive concentration can cause rigid fruit and damage to leaves. Highly toxic and high-residue pesticides are strictly prohibited. Pesticide safety interval.

2. The specific management measures should be flexibly grasped according to the growth period of the strawberry, the nutritional status of the plant, the occurrence of diseases and insect pests and the weather conditions.

3. Pay attention to rural cleanliness and prevent fruit pollution. No growth regulators and hormone-containing foliar fertilizers are used to ensure fruit quality and better storage and transportation.

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Lower limb Locking Plate

Lower Limb Locking plate is a kind of implant fracture orthopedics with locking thread holes.

The lower limb locking plate allows the bone to bind to the plate more firmly, so that the reduced limb is more stable. Locking plates were first used in spine and maxillofacial surgery 20 years ago to stabilize fractures while reducing extensive dissection and damage to soft tissues. When the threaded hole in the locking plate is screwed in by a screw with a threaded head, the plate becomes an Angle fixing device. It can have both locking and non-locking holes for different screws to be screwed in. Any plate that can be screwed into an Angle fixed (stable) screw or bolt is essentially a locking plate.

Locking plate system does not rely on bone friction to achieve connection, but completely depends on the interlocking structure of the plate itself. A certain gap between the plate and the bone surface can be left, which can eliminate the adverse effect of heavy pressure contact between the plate and bone, and greatly improve the blood supply and the growth and recovery of the periosteum. The main biomechanical difference from conventional plates is that the latter relies on friction at the bone-plate interface to accomplish plate compression on bone. Stability is maintained by an angularly stable interface between the screw and the plate. Because the locking internal fixator has a stable integrity, the pull-out force of the locking screw is much higher than that of the ordinary screw. It is difficult for a single screw to be pulled out or broken unless all the surrounding screws are pulled out or broken.

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