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Two stages of watermelon seedling raising technology
Two stages of watermelon seedling raising method, that is to say, seedling seedlings (with 2 undeveloped or freshly cotyledoned seedlings) are firstly concentrated in the matrix seedbed, and then the cotyledon seedlings are transplanted into the seedling shoots for the method of raising the seedlings. The advantages are: the bed seedbed keeps a high bed temperature at all times, ensures that the seeds have a higher seedling emergence rate, and can be transplanted in batches to the false value in the seedbed in accordance with the emergence, so that the size of each seedling seedling seedling is basically the same, and thus the seedbed Convenient management, good quality melon seedlings, high seedling rate. The main technical measures are summarized as follows: 1. Preparation of matrix and nutrient soil The matrix (ratio 1:2:1) is a mixture of ash or perlite, peat, vermiculite. The nutrient soil is made up of 90% paddy soil, 8%-10% composted pig manure, and a small amount of imported ternary compound fertilizer. 2. Construction of nursery beds Nursery beds are generally built in vegetable greenhouses or in bamboo sheds. Seedbed width is generally 1.2-1.5 meters, cloth hotline, line spacing of 7-8 cm. A layer of plastic film is laid on the surface of the bed after heating, and the nutrients or the substrate is discharged. 3. Seed treatment before sowing for 2 days and soaking in warm water at 55°C. When soaking, stir it with a small rod for 15 minutes, then soak it for 3-4 hours after cooling. 4. Sow 800-1000 seeds per square meter so as to cover a layer of dry and damp medium, with a thickness of 0.5-1 cm, lay a layer of plastic film and cover the two small rings, and turn on the power supply. 2 - Leaves seedlings for 3 days. 5, when the cotyledon seedlings height 2 cm when the seedlings can be transplanted and planted, after the imitation of a cotyledon seedlings should be thoroughly watered once, and cover 1-2 layers of small ring film insulation moisturizing, after the electricity heating Line warming. 6, the temperature management matrix seedbed temperature control: during the day 30-32 °C, no less than 15 °C at night, to promote seedlings, pay attention to cool at noon on the sunny day, control the emergence rate. The temperature of the artificial seedbed was: at the beginning of the planting, until the first leaf was unfolded, the temperature was 25-28°C during the day and 15-16°C during the night. After the first true leaf is unfolded until the third true leaf appears, it is 30-35°C during the day and 16-18°C at night. One week before transplanting, the bed temperature was gradually reduced and the bed temperature was gradually reduced from 16°C to 12°C to adapt to the field environment. 7. During the period of Other management and prosthesis, it is necessary to appropriately increase the number of ventilation, extend the lighting time, timely watering, and prevent the diseases at the seedling stage.
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