Winter greenhouse watermelon cultivation technology

Properly growing seedlings in the greenhouse from January 15th to 20th, the watermelon seedlings are grafted to the gourds when they grow to two leaves to improve the disease resistance and low temperature resistance of the plants. The grafting method is based on the connection method when the watermelon grows to 4~5. When the leaves are really cold, they are ready for colonization.

Cultivation and management Re-fertilization, fine soil preparation, timely planting: Apply plantar fertilizer before planting, apply 2,000 kg of chicken manure per acre, 100 kg of compound fertilizer, and then deepen the soil. In the first half of March, when the watermelon grows to 5~6 true leaves, the row spacing is 1.5 meters and the distance between the rows is 0.7 meters. The mulch is covered with a small arch shed. At the time of colonization, the grafting interface must be left on the ground to prevent the occurrence of adventitious roots.

The management after planting is mainly the integrated management of temperature, humidity and top-dressing irrigation. After the planting, in order to speed up the seedlings, generally do not ventilate, maintain high temperature, during the day 28 °C ~ 32 °C, 12 °C at night.

After easing the seedlings to the flowering period, the shed temperature is not lower than 25°C and the ground temperature is above 15°C to increase the fruit setting rate. After extending the vines, the small arch shed was removed, the first top-dressing watering was conducted, and the Mu chase 30 kg of compound fertilizer.

After half an hour of flowering, the growth of fruits is accelerated. The insulation work should be done well, and the melon within 8 knots should be eliminated promptly, and the second or third normal developing melon should be selected. When the melon grows to a diameter of about 15 cm, it is combined with watering. For the second time dressing, mu compound fertilizer 15 to 20 kg.

Greenhouse soil moisture is high, stems and leaves easy to grow long, so irrigation should pay attention to less watering, sitting in the melon log water, enter the mature period after the control of water, in order to facilitate fruit coloring and increase fruit sugar content and speed up fruit ripening.

Plant adjustment and artificial pollination Watermelon branching strong, must be plant adjustments in order to seize high yield, including pruning, pressure vine, melon, melon and picking heart. The melons are generally selected to have the second or third female flower sitting on the vine, and the main vine can leave the cranberry on the melon when it is unretained. When the fruit is set for 20 days, the shape of the fruit is basically set. Every 3 to 5 days, the fruit can be picked in the sunny afternoon and the fruit is evenly distributed.

Cultivation of watermelons in greenhouses requires artificially assisted pollination, usually at 10:00 am. Large male flowers are selected to expose stamens. The female styule is gently touched to make the pollen evenly on the stigma, in case of low temperatures or poor weather conditions. The male flower was taken off the afternoon of the previous day, placed in a closed container, kept at room temperature at 25°C, pollinated after flowering in the morning, and marked the date of flowering after pollination in order to pick the melon in time.

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