The current winter and spring cucumber management grasp what

Sunlight greenhouse cucumber in winter and spring is a critical period of fruit growth in March and April. The output of this period accounts for more than 70% of the total output. Therefore, it is very important to do well in this period of management.

1. Temperature Management: The temperature control of the solar greenhouse mainly depends on the opening and closing of the vents and the uncovering of the grasshoppers. It requires 25°C to 30°C during the day and 13°C to 15°C during the night. The reason why the night temperature is low is because photosynthesis is not carried out at night, but photosynthetic substances need to be transported. At the same time, low temperature can reduce respiratory consumption. In addition, ultraviolet light is lacking at night, and high temperatures can cause plants to grow. Generally within 24 hours of a day, the average temperature can increase by 1.17 kg/sq.m. for every 1°C increase in temperature in the range of 15°C to 25°C. At this time the ground temperature should be controlled at 20 °C ~ 25 °C, according to the law of daily changes in the temperature of the greenhouse, and cucumber physiological activities at different times of the day combined with temperature management, the so-called "four-stage" management: 10 am For the strongest stage of photosynthesis, the temperature can be maintained at 26 °C ~ 30 °C; the afternoon light gradually weakens, and at the same time with the night temperature, temperature control at 20 °C ~ 24 °C; in the middle of the night in order to promote nutrient transport, temperature control in 15 °C ~ 19 °C; after the middle of the night to inhibit breathing, reduce nutrient consumption, temperature control at 10 °C ~ 14 °C, sunny days take the lower limit, cloudy days to take the upper limit. Debriefing in the morning should be at room temperature 8 °C ~ 10 °C, the afternoon room temperature dropped to 17 °C should be immediately covered.

2. Illumination management: Insufficient illumination of cucumber in winter and spring is one of the main factors limiting the yield. The following measures can be taken to remedy: (1) Absorb natural light as much as possible, often clean the surface of the shed film, and maintain a high light transmittance. Meanwhile, Under the premise of ensuring room temperature, as soon as possible to open up early, cover late; (2) in the wall hanging aluminum reflective film to improve indoor light intensity and distribution; (3) timely removal of side branches, diseased leaves, old leaves , And keep the surface of the mulch clean, improve the permeability between the lines and the lower part.

3. Humidity Management: The solar greenhouse is an artificially created closed environment. The humidity in the room is mainly controlled by air release and irrigation. In principle, after the watering, it is necessary to let off the air at the noon. If there is a low temperature and a cloudy day, only the top wind will be released. If the weather is sunny, the top wind and waist wind will be released at the same time.

4. Fertilizer and Water Management: Both the vegetative growth and reproductive growth of greenhouse cucumbers have entered a period of strong growth. The consumption of nutrients and water is large. Therefore, the supply of fertilizer and water should also be increased. Due to the large amount of organic fertilizers that have been applied during the site preparation, water supply has become the focus of management during this period. According to the different water retention properties of the soil, there is a difference in the number of days between watering. Under normal circumstances, the water is poured every 5 days, and it must be thoroughly drenched. After 3 to 4 days of watering, the mulching soil not covered by the mulch is used once to increase the permeability of the soil and facilitate the development of the root system. In terms of fertilizers, this period is mainly supplemented with easy-to-absorb full-price fertilization, and it is better not to apply nitrogen fertilizer alone. From the law of cucumber requirements for fertilizer, for every 1,000 kilograms of fruit produced, 2.8 kilograms of nitrogen, 0.9 kilograms of phosphorus pentoxide, and 3.9 kilograms of potassium oxide are needed, and the ratio is roughly 1:0.31:1.4. Therefore, it can be seen that potassium is important in the fruitful period. Sex. Foliar fertilizer can be sprayed with 40 g of potassium dihydrogen phosphate per acre and 15 g of urea.

5. Spraying plant growth regulators: As mentioned above, the result is a period of vigorous growth of vegetative growth. Regulating the relationship between the two to achieve a balanced development is one of the effective measures to achieve high yields. The author used 0.15% natural brassin on tomatoes, cucumbers, leafy vegetables, fruit trees and other crops, and all showed significant yield increase effects. The spraying concentration was 7500 times. There are three main roles of regulators: one is to increase the chlorophyll content, delay the senescence of green leaf tissue, thereby increase the photosynthetic efficiency, synthesize more carbohydrates, meet the needs of fruit and stem and leaf growth, and secondly, promote the development of roots and maintain the root system. Vitality, to promote the absorption of nutrients; The third is to promote the transport of nutrients to the fruit in the plant, making the proportion of fruit growth and stem and leaf growth tend to be reasonable, lay the foundation for high yield.

6. Timely fruit picking: picking too early, the fruit has a weak water-holding capacity, is prone to losing water, and has a short shelf life; the picking is too late, the fruit is aged, and the quality is poor, resulting in unnecessary consumption of nutrients and affecting subsequent production. Generally 1 to 2 days picking time, strong and strong to stay bigger, weak picking earlier, to grasp the melon strip length of 25 to 35 cm is appropriate.

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