Early Spring Watermelon Seedling Notes

Early spring is a critical period for watermelon seedlings, and it is also a key period for melon farmers to harvest melons and watermelon varieties this year. Let's discuss the related issues of watermelon seedlings together:

I. Selection of good varieties It is advisable to select medium-fruit watermelon varieties suitable for planting in early spring greenhouses, including Zhengkang l, Zhengzhou 931, Zaojiao 3, Jingxin 3, and Jingxin IV.

Second, nursery management

1. Disinfect the seeds with 50°C-55°C: soak in warm water for 20 minutes or soak with 200 ml of neomycin or streptomycin for 2 hours.

2, soak germination to ensure that more than 90% of the emergence rate. Appropriate seed bed temperature, watering chemical fertilizer solution, can promote seedless watermelon seed development and seedling growth.

3, sowing nursery Choose the appropriate nursery containers, such as wooden boxes, etc., the bottom pad into the 6-8 cm thick wheat bran, which put about 10 cm thick sand, leveling drenched water. The cultivar will be promoted buds are 虻仄 虻仄 虻仄 谏趁嫔 谏趁嫔 俑 俑 俑 俑 俑 俑 俑 silkworms to eat dry .5 cm thick. After sowing seeds, keep them moist and keep warm at 25-30°C. To (top nose stage, spray water once with watering can, then spray water once every 2-3 days.

4. Watermelon nursery management In addition to rain and cold days, every day from 9 am to 3 pm, the grasshoppers are removed, the debris on the membrane and the water droplets on the back are removed, so that the film can transmit light well to facilitate the raising of the seedbed temperature. . Around 4 pm, grass cover insulation will be covered in time. After 4-5 days of mellow soil adoping, the film can be extracted from one end. Bed temperature before emergence should be controlled at about 30 °C. After 80% emergence, the vents of the film should be opened to ventilate and prevent leggy. Ventilation should be open from the leeward side, and the vents should be small to large. The time from short to long should not be suddenly and heavily ventilated to prevent the seedlings from "flashing." After emergence, before the first true leaf is unfolded, the seedlings are easy to grow and must strictly control the bed temperature, generally not exceeding 25°C. Ventilation should be increased 7-10 days before colonization. Gradually cooling seedlings. All plastic films were removed 3-5 days before transplanting. The seedbed was sprayed with 50% Thiothiophene EC 800 times and 40% Dimethoate 1500 times. Seedlings should be carefully watered and generally not watered before emergence. When the seedlings top soil and soil surface cracks, can be covered with fine soil to prevent evaporation of water. When the seedbed is dry, spray water can be used to spray warm water. The water spray should be carried out in the sunny morning. When the true leaves are unfolded, the amount of water spray can be increased and the water sprayed once every 3-5 days. Do not water the seedbeds 1-2 days before transplanting to prepare for seedlings. After careful management for about 30 days, when transplanting, the melon seedlings can reach the leaves with bright green color, thick leaves, short and thick hypocotyls, 6-7.5 cm, and 3-4 leaves can be planted in the standard of strong seedlings. .

5. Disease prevention and control The disease of seedlings of watermelon is mainly to disease, blight, anthracnose and so on. The seeds should be disinfected; the disease-free bed soil should be used, and the organic fertilizer should be fully decomposed; the scientific management of the seedbed should be done so that the suitable temperature and humidity in the seedbed can be maintained; the disease should be promptly treated with pesticides; Hydrochloride, metalaxyl, mycotoxin, Precore, chlorothalonil, thiophanate-methyl, antiviral agents, amidoxime, 100 grams, Shile, and other agents.

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