(1) The balcony must be ventilated. A closed balcony will not have a good planting effect. Besides sunlight, ventilation is also essential for the growth of plants. Poor ventilation makes it difficult for seedlings to grow and easy to get sick.
(2) When watermelon grows to a certain stage, the demand for nutrients and water is huge, and the relatively small flowerpot can't accommodate its roots and its demand for nutrients. The data showed that every 100 kg watermelon needed to absorb about 0. 19 kg nitrogen, 0. 092 kilograms of phosphorus and 0. 136 kg of potassium. However, there are obvious differences in nutrient absorption in different growth stages, and the germination stage accounts for 0.0 1%, 0. The seedling stage is 54%.
(3) Variety selection is also very important. At present, there are many watermelons on the market, so it is necessary to choose varieties suitable for balcony planting, such as early maturity, disease resistance, easy fruiting and beautiful varieties. At present, there is thumb watermelon, which is delicious, edible and ornamental. Of course, there are many varieties, such as green and red pulp, green and yellow pulp, yellow and red pulp, black and red pulp potted watermelon and so on.
(4) When the seedlings grow to a certain length, they must be put on the shelves, and the main vines 10- 15cm should be put on the shelves as scheduled. Be sure to fix it when you put it on the shelf, so that the melon will not fall off when it grows up.
(5) Watermelon pollination is also very important. The flowering period of watermelon mainly depends on insects such as bees. The balcony planting needs artificial pollination. Watermelon flowers are divided into male flowers and female flowers. There is a "small watermelon" and an oval ball under the petals of the female flower, but the male flower does not. After flowering, you can pick the male flowers and light them on the female flowers. Generally, pollination is better in the morning.
(6) Attention should be paid to aphid pests, such as blight, blight, virus disease, bacterial leaf spot and other diseases. If found, they should be sprayed as soon as possible.
(7) Be sure to water it moderately, not too much, otherwise it will easily rot the roots.
The above shared some precautions of potted watermelon, hoping to have reference value for netizens.