Laboratory ovens are ovens for high-forced volume thermal convection applications. These ovens generally provide uniform temperatures throughout. Process applications for laboratory ovens can be for annealing, die-bond curing, drying, Polyimide baking, sterilizing, and other industrial laboratory functions. Typical sizes are from one cubic foot to 0.9 cubic metres (32 cu ft) with temperatures that can be over 340 degrees Celsius.
Laboratory ovens can be used in numerous different applications and configurations, including clean rooms, forced convection, horizontal airflow, inert atmosphere, natural convection, and pass through.
Some of the types of industries that typically use these laboratory ovens are the healthcare industry, technology industry, and transportation industry. Civil engineering laboratories uses ovens for drying asphalt, soil, rock, or concrete samples.
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1. Early maturing varieties of pumpkins, female flowers open first, no male pollination, that is, female and male flowering period is not encountered.
2. Early flowering, low temperature, poor female flower development, slow growth of pollen tubes, poor fertilization.
3. Excessive use of nitrogenous fertilizers and rain caused long-term greed for youth, stems, leaves, and main and lateral vines all grew stronger than fruit, and flowering resulted in insufficient nutrients, resulting in falling fruit and fruit.
4. Pumpkin is a cross-pollination plant of both male and female plants. When it blooms, it encounters rain and rain. Insect activity is hindered and artificial pollination cannot be achieved, resulting in failure of pollination.
5. The first fruit was not harvested in time, causing the second fruit to fall off. This mainly means eating pumpkin.
6. Keeping the seedlings too dense is not conducive to transparence and light transmission, and it is also the cause of falling flowers.
Prevent falling and falling fruits
1. Regulate the relationship between vegetative growth and reproductive growth. The vegetative growth is too prosperous. When the main vine grows to 12 knots, there is still no female flower. At this time, it is necessary to weaken the apical dominance and promote its vegetative growth to reproductive growth and transformation. The methods are: 1 Change head: When the main vine does not produce results, you can cut off the main vine before the main section of the main vine with the lowest number of vines. The vine is closer to the root and the main vine is better. Melon is a vine seed. 2 laps: circle the main vine and tie it with a rope. 3 Take: Sprain the main tip of the main vine so that the vascular sac route is frustrated. 4 Broken root: A deeper cultivator can be used to cut off a portion of the root.
2. Falling flowers and fruit caused by too much female flowers can remove some of the flowers and fruits.
3. Artificially assisted pollination: (1) It is most suitable at 8 to 10 o'clock in the morning when the pollen is ripe. Remove the strong male flower, remove the petals, and gently apply the anther to the head of the female flower. At this time, the stigma secretes mucus and the male flower pollen stick to. A male flower can give 2 to 3 female flowers in succession. After pollination, use a leaf or corolla cover to prevent rain from washing away pollen. Place the pollinating bees in the pumpkin flowering season and place 2 to 3 boxes per hectare.
4. Closely planted with reasonable density, 1.2 to 18 thousand plants per hectare are suitable, early-maturing varieties are easy to be dense, and late-maturing varieties are easy to thin, which is conducive to ventilation and light transmission, improves fruit setting rate, and can also prevent and control epidemics.
Prevent pumpkin falling flower fruit management technology
Causes of falling flowers
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