Recently, the continuous haze weather has brought a lot of inconvenience to melon seedlings. When the nursery is raised, it is feared to encounter even cloudy days, especially melons, especially in the winter. Most of the melon farmers used to raise temperature in the greenhouse to raise seedlings, the temperature is more difficult to control, coupled with haze weather, it is easy to cause melon seedlings to appear "high foot seedlings."
The "high-legged seedlings" are also called long-necked shoots. The morphological manifestations are less roots, finer stems, thin leaves, light color, long internodes, and weakness (see figure). Such flower buds of seedlings have poor differentiation, poor resistance, low survival rate after planting, slow seedlings slowing, and poor disease resistance, so they cannot produce early and high yields. The emergence of melon “high-leaved seedlings†in greenhouses is directly related to high temperature, high humidity, weak light, low temperature difference between day and night in the greenhouse, especially at night and rainy days, high temperature and humidity, lack of light, will cause seedlings to appear overnight Actually, the rapid formation of "tall young seedlings."
In winter, haze weather occurs frequently, and the following measures can be taken to prevent melons from growing.
Regulates the temperature and humidity at the seedling stage. Adopt two-layer film to cover heat and raise the seedlings. The temperature should be maintained at 28°C～30°C before emergence. When 20%～30% of the seedlings are unearthed, the first layer of film shall be removed in time. After emergence, the temperature is controlled at 20°C to 25°C during the day and 15°C at night. Fog days, mainly through the heating furnace to control the temperature, in the absence of light, the 150-watt light bulbs can be hung, hang one for every 2 meters, add light to increase temperature, to prevent the emergence of leggy seedlings.
In terms of humidity, in principle, seedlings do not appear water-deficient and do not water. When it is found that the nutrient soil is relatively dry, it may be properly moistened. Before transplanting, rooting with a transplanting spirit or rattan. Cooling the seedlings for 3 days before transplanting.
Strictly controlling the use of fertilizers during nursery and the emergence of tall seedlings indicate that the temperature is high, nitrogen fertilizer is more, and moisture is sufficient. In controlling the temperature, fertilizers are strictly controlled, including foliar fertilizers. If the seedlings are found to be yellow, appropriate supplemental phosphorus and calcium supplements, and root-enhancing seedlings, spray low concentrations of potassium dihydrogen phosphate and rattan water-soluble fertilizer.
For the “high-stemmed seedlings†that have emerged, choose sunny weather, add 1 gram of paclobutrazol per 15 kg of water, spray the seedbed, and spray only once, and do not repeat the spraying back and forth.
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