Recently, most of the strawberry production in Beijing has entered the budding period, and most growers have completed agricultural operations such as shed film, quilting, and mulch film. At present, there are problems such as weak plant growth, more dead seedlings, powdery mildew induced, leaf mites and twill moth larvae in some plots. In order to ensure the healthy growth of plants and smoothly enter the flowering and fruit setting period, experts from Beijing Agricultural Technology Extension Station put forward the following technical guidance for the reference of production units.
Reasonable control of temperature and humidity
Recently, the outside temperature has the characteristics of high daytime and low day and night, the temperature change in the shed is large, and the growth of strawberries is easily affected by high temperature, causing diseases and insect pests. The suitable temperature and humidity conditions for the strawberry budding period are: the daytime temperature is 25~28°C, the night temperature is 8~12°C, and the humidity is 60%~70%. In the morning and noon, you can open the down air outlet to strengthen ventilation, to prevent the temperature in the shed from being too high, causing the plant to grow, and after the temperature is reduced, the air outlet should be closed in time to cover the quilt to ensure the temperature in the shed at night.
Adjust the mulch film
After laying the mulch film, it should be adjusted in time, the mulch film cover is uneven, the ground fit is not good, it is not conducive to thermal insulation and moisturizing, and the inflorescence is easy to grow under the membrane, affecting the flowering and fruit setting. It can be properly irrigated, and after the soil is moistened, the mulch film is in full contact with the ridge surface, so that the membrane surface is stretched and not wrinkled, and then the surrounding area is compacted with stones or soil blocks to prevent the wind from lifting the mulch.
Fill in at the right time
After laying the mulch film, the ground temperature rises, and the water should be replenished in time to prevent the plant from wilting. Ridge surface double row colonization, drip irrigation equipment to lay two lines of appropriate. Irrigation should be carried out in the morning, once every 3 to 5 days, to keep the soil sticky but not dry, and the relative moisture content of the soil during the budding period should be maintained at 70% to 80%. Elevated cultivation depends on the substrate water retention, which can increase the number of watering and make the water evenly diffused.
Give fertilizer in an appropriate amount
Entering the flowering period of the buds, the demand for nutrients has also been further improved. Before flowering, you can apply nitrogen, phosphorus and potassium balanced water-soluble fertilizer (20-20-20) once, 1 to 2 kg per mu each time, pay attention to control fertilizer, to avoid excessive fertilizer water burning seedlings. Boron fertilizer calcium fertilizer and potassium dihydrogen phosphate fertilizer can be sprayed on the foliar surface, about once every 7 days.
Timely replenishment
Seedlings with disease enter this stage, the nutrients in the early body are exhausted, a large number of dead seedlings will appear, the diseased seedlings and dead seedlings should be pulled out in time, and the 98% xanthocyllox wettable powder 2000 times liquid is used for irrigation, leaving the strong plant creeping stem seedlings to replenish the seedlings in time. It is advisable to retain 5 to 8 leaves per plant during the budding stage, but too few leaves are not conducive to the absorption and accumulation of nutrients by photosynthesis.
Pests and diseases are mainly prevention
Before flowering, we must pay attention to the control of diseases and insect pests, and should be prevented by drugs 1 to 2 times, which can reduce the impact of flowering drugs on flowering and fruit setting, and give priority to the use of smoke method and dust method. Powdery mildew that occurs during the budding period is mainly harmful to strawberry leaves, focusing on spraying the back of the leaf with a chemical, once in 5 to 7 days, 2 to 3 times in a row, and spraying in all corners of the greenhouse. Red spiders release predatory mites for control at the beginning of the occurrence, and when a large number occurs, they first use drugs to control 2 to 3 times to reduce the number of insect mouths of red spiders, and then release predatory mites for biological control. Twill nocturnal moth must be detected early, early spraying, you can use 1 billion virions / ml twill nocturnal moth nuclear polyhedral virus suspension or 1.8% avermectin emulsion 2000 times night control, the use of old mature larvae diurnal nocturnal characteristics, choose the evening for medication, the dosage should be sufficient, even spray foliar leaf back. (Conan Goose Ma Xin)
Source: Qianlong Network