Most vegetables require strong light conditions. However, in winter, especially in rainy and snowy weather, the light is weak. The lack of light in greenhouse vegetables is a common problem. Insufficient illumination not only fails to produce more vigorous photosynthetic activity, but also reduces transpiration. Plant growth is delicate and can not help but affect the yield and quality of vegetables. For example, tomato pollen dysfunction and infertility under low-light conditions; short-bloomed flowers appear in eggplants, affecting pollination; nutrient imbalances in vegetable plants such as gourd and watermelon, causing flowering and fruit drop. Some experts call these phenomena "light hunger." How to prevent "light hunger"? Use high-quality non-drop film and keep it clean. The quality of the non-drop film will affect the light intensity in the shed, the high-quality non-drop film has high light transmittance, and it is not easy to contaminate the dust; the poor quality non-drop film is easy to be aged, easily polluted, and the light transmittance is also reduced. The drop-free film transmittance also decreases with longer use time. According to measurements, within 13 days after the new high-quality non-drip film, the transmittance of the film at noon reached 93%. After 73 days, the light transmittance of the film was reduced to 81%. Therefore, economic cleaning of the shed film and keeping the shed film clean and smooth is one of the important measures for greenhouse vegetables against “light hungerâ€. The use of a shed film for one year generally reduces the light transmittance by 30% to 40%. For melons and vegetables other than cucumbers and wax gourds, greenhouse vegetables such as solanaceous vegetables, vegetables, beans, etc. have strict requirements for light intensity. Production, it is best to replace the new high-quality non-drip film. Cultivation measures improve lighting conditions. Some cultivation techniques can significantly improve lighting conditions in the shed. For example, vegetables are used in a north-south direction, with large row spacing and small row spacing, so that all rows can get better light conditions; melon vegetables, eggplant vegetables, etc., through the stalking , remove old leaves, vines in time and other measures, adjust the plant light conditions, stay to play a better "grace" use. Film cover. Plastic film coverage generally has better warming, water retention and soil consolidation effects, and has a better "lightening" effect. Due to the reflection of water droplets attached to the surface of the mulch and the mulch, the reflected light and scattered light near the ground can be enhanced by 50%-70%. For peppers, eggplants, tomatoes, etc., the lighting conditions can be improved, and the soil temperature can also be increased. . In the mulch, milky white and silver-gray films reflect more, the transparent film is centered, and the green and black films are less reflective. In the growing stage of greenhouse vegetables, the previous medium-term grace was obvious, and it was not obvious after sealing. Therefore, in the middle of the greenhouse vegetable combined with warming, can be covered with white or gray-white film or silver-gray film (as well as the role of flooding) or transparent film. Use a reflective screen in the booth. On the south side of the inner wall of the greenhouse or the rear pillar, a poly-aluminum-plated aluminum film is used as a light curtain, which can obviously “graceâ€. According to observations, the ground plane within 3 meters from the light curtain at 11 o'clock in the morning has an average increase in light intensity of 0.7 million lux over the shed without a light curtain, increasing the utilization rate of light energy by 25.2%; and measuring the light intensity at 1400 hours by 0.69 million lux. Increase the utilization of light energy by 23.4%. At the same time can increase the ground temperature 1 °C -2.5 °C. Specific use: In the first half of the first year of November, the curtain of light was opened and removed in mid-April of the following year. Hang the length as required, measure out two equal-length light curtains, and glue the two light curtains together with a transparent tape to form a 2-meter-wide banner. Pull the two east-west fine wires in the upper front of the column in the greenhouse. Wrap the upper and lower edges of the curtain back about 3 cm and fix it with a transparent tape or paper clip. The light curtain can also be directly fixed on the back wall (remaining vents must be left). Note: There must be a gap below the reflective screen to facilitate watering; places that are close to the light curtain should be properly watered, and the nursery should be nursed. The seedlings should be kept at a distance of 50 cm from the light curtain to prevent burning.
Dingmin Pharmaceutical supply Decitabine API and Decitabine Intermediates with high purity and best price. The main products CAS No are as follows: 3601-89-6, 2353-33-5, 931-86-2, 3601-90-9. Sample can be sent if you request.
Welcome to do business with us. Please email to us directly.
Decitabine Intermediates
Cas 2353-33-5,Decitabine Intermediates,5-Azacytosine
Shijiazhuang Dingmin pharmaceutical Sciences Co.,Ltd , http://www.dingminpharma.com