Watermelon is a cross-pollination crop that can only sit on melon after pollination by pollinators such as insects and wind power. The watermelon planted in the greenhouse is in the harsh winter and early spring seasons. The temperature inside the shed is low, there is no wind, and there are few insects inside. Therefore, artificial pollination is needed to promote sitting. In recent years, with the rapid expansion of the cultivated area of ​​watermelons in greenhouses, some novice farmers have been unable to control the cultivation techniques of the greenhouses, and they often appear to be incapable of eating melons (commonly known as “melonized cucumbersâ€). Summary In recent years, experimental studies and practices have shown that as long as the following measures are taken, the rate of sitting can be greatly improved.
Seizing the best time for pollination pollination artificial pollination quality is the key to determining the level of sitting rate. Watermelon in the sunny conditions, the opening of the morning pollen's vitality, sustainable for about 3 hours. After 10 a.m., the greenhouse temperature rose rapidly. With the increase of temperature, pollen vigor gradually decreased. Before and after noon, the temperature was too high, resulting in complete loss of pollen vitality. Before 8 o'clock in the morning, the temperature was low and pollen had not been released, so it was not appropriate to pollinate. The optimum temperature for pollination of watermelon is 25°C~28°C. The temperature can be adjusted by opening and closing the vents. If the temperature of the greenhouse exceeds 30°C, ventilation should be used to reduce the temperature. The appropriate time for pollination is from 8 to 10 o'clock in the sunny morning. At this point, most of the pollen has been evacuated, and the temperature is appropriate. This is a good opportunity for pollination and pollination should be completed within this period of time. The author found that many melon farmers are often busy with greenhouse warming, and then conduct pollination, resulting in near noon when pollination, missed the best pollination time, resulting in greatly reduced pollination.
Raising the quality of pollination The right choice of flowers is the key to ensuring the quality of pollination. Male flowers used for pollination require large and bright flowers, anthers developed, pollen and more female flowers; female flowers are ovary hypertrophy, surface hair dense, stalks long and curved, located in the upper part of the main stem, 10 to 15 cm from the top of the second female flower. When pollination, remove the petals of the selected male flowers with tweezers and expose the stamens. Then, gently hold the pedestal of the female flower to expose the stigma. Place the stamen on the stigma of the pistil and rub it gently to make the stigma stained with pollen. You can. After pollination, the pollination node is marked to determine the maturity of the watermelon. On the afternoon of the second day after pollination, if the female flower handle sag and grow, the front end of the ovary starts to touch the ground, indicating that the pollination is successful; if the pedicel of the female flower is still upward or still straight forward, pollination is generally unsuccessful and needs to be renewed. pollination.
Control of prolonged anti-chemical melons appear when the melon vines grow fast and fat, long internodes, thin and large leaves, young melons can not sit or sit and grow slowly, that is, the performance of long plants. At this time, we must do a good job in controlling fertilizer and water while doing a good job. Method of pinching the vine: In the upper part of the young larvae, gently pinch the vines from the leaves of 2 to 3 leaves of the young larvae (pinch and flatten), which can be used as a “click and ring for three daysâ€. effect. Pruning vines can reduce the transfer of nutrients to the stalk growth point, increase nutrient delivery to young larvae, promote the growth of young larvae, and prevent the detachment of the squashed larvae.
Stalks of vines must be adapted to local conditions. Many melon farmers saw the larvae grow to the size of their fists. However, for plants that are growing vigorously, picking up at this time often results in melons, and the time for picking the heart should be delayed until the size of the larvae grows and the color of the rind becomes dark. Prosperous plants are often caught too early and can easily lead to cracking melons.
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