The more melon, in Guangdong, Guangxi and Taiwan, also known as white melon, is an annual creeping plant of Cucurbitaceae melon, is one of the major vegetables in summer and autumn in Guangdong. In recent years, the planting area of ​​Guangdong's white squash has been continuously expanding, and the demand for seeds has been continuously increasing. However, because of the special climate factors in South China, white melon seed collection often causes melon rot, which seriously affects the profitability of seed collection. Therefore, research has been conducted. A good solution to this problem is to introduce seed collection technology as follows. 1 Proper sowing, reasonable close planting of white melon is a warm temperature crop, poor cold resistance, generally in the local after frost, soil temperature 15 °C and the temperature of 20 °C above the season cultivation. In Guangdong, the suitable sowing date is from April to August. The spring-planted white melon usually broadcasts directly after the Ching Ming. The seeding is too early, and it is susceptible to frost damage. The seedling emergence is slow and irregular, affecting the growth and development of seeds and seed formation in the later period. Due to the large amount of rainfall in South China, many sorghum, deep drains, and mulching (or straw, fern, etc.) cultivation are used. In order to increase the seed yield, the farming fields should be planted closely. Usually single or dual line planting, single line spacing 18-20cm, spacing 130-150cm; double row spacing 40-60cm, spacing 150-200cm, 2-4 per hole, 667m2 planting 3000-3500 strains. 2 Strict isolation of seed collections to prevent the biological mixture of white melons is an insect-like flower plant of the same sex. It is prone to natural hybridization between varieties. It is required that no other varieties of melons within 1500 cm around the harvested field bloom at the same time. Under this isolation condition, insects can be freely pollinated and retained. In order to increase the yield, artificial pollination can be used to retain seed. When artificially assisted pollination, the female flower and male flower corolla on the same type of plant were clamped at the same time on the afternoon of the 1st day of the opening of the selected female flowers in the afternoon with a 3cm long aluminum wire code, and then they were moderately tight; then on the day of flowering, from 8 to 11 am. Collect the clipped male flowers, remove the petals, and lightly wiping the stigma of the female flowers with the male anthers. Hold the female corolla with the original aluminum thread code and label it. Usually a male flower can give 1-2 female flowers. Selection of 3 Strains and Seeds In order to ensure seed purity, selection of seed and seed must be performed. First of all, before the seedlings are sown, the seedlings with the same growth, no pest hazards, and no deformity are selected; secondly, when the fruit is set and blossomed, the plants with moderate growth potential, moderate female flower nodes, no abnormal performance and no pest damage are selected. After planting fruits and pollination, the fruits with normal growth were selected in stages as seed melons and tagged. Finally, when the melons were harvested, the fruits with normal melons, which accorded with the characteristics of varieties, and which were free of pests were selected. 4 In a timely manner, the top of the mango cultivar consists of side vines and vine vines. According to the habits of male and female flowers, the main vines, side vines and vine vines should be topped in time. The principle of topping is generally adopted the "535" system, in which the main vines, side vines, and sun vines are topped in five true leaves, and the side vines and the vine vines are preserved respectively in 5 and 3; specifically : When the main vines are 4-5 pieces of real leaves, they are topped with 4-5 pieces of lateral vines. The vines are spread evenly on the pods on both sides of the main vine; each side vine is left with 4-5. Leaves topping to promote the growth of Sun Man. Generally, each side of the vine leaves 2-3 vines, and Sun Man leaves 4-5 leaves to top. It no longer retains vines. Timely topping and cultivating is an important guarantee for ensuring fruit set and increasing seed production. Too many vines are left, the branches and leaves of the plants are too complex, causing running squatting, which inhibits reproductive growth and is not conducive to fruit setting. 5 Fertilizer Water Management and Pest Control The amount of nitrogen, phosphorus, and potassium fertilizers used in the field is different from that of production fields. Phosphorus and potassium fertilizers should be added to the base fertilizer to promote full development of the seed. Therefore, in the fertilization on the white melon farming should be based on their needs for nutrients, grasp the principles of multi-phosphorus, potash fertilizer. Before squatting, 667m2 applied farm manure such as pig manure 1500-2000kg and compound fertilizer 20kg; topdressing mainly inorganic fertilizer, including 667m2 nitrogen fertilizer 10-15kg, phosphate fertilizer 20kg and potassium fertilizer 10kg. A large amount of fertilizer is required for farming, but fertilizer and water should be properly controlled before fruit set, so as to prevent the melon from growing due to excessive plant growth. After sitting on the melon, start top dressing and watering to maintain the plant growth and promote fruit enlargement. After the fruit is shaped, the water should be properly controlled to promote full development of the seed. The pests and diseases that harm the white melon seed melon mainly include: cotton rot, anthrax, and leaf miner. Especially in the spring planting of white melons, due to the rain in late spring and early summer in southern China, the plants grow and grow in high temperature and humidity, side vines and fruits often come in contact with the ground, and are prone to pests and diseases. When anthrax occurs, the fruit begins with a small spot of light green water stains, and then expands into a brownish spot that is nearly round in the middle of the pit. Orange viscous material spills over the surface, causing the fruit to rot. At the beginning of the disease, 50% carbendazim WP can be sprayed 600 times or 65% zeinzine WP 500-800 times or 75% BBW WP 600-800 times. Cotton rot can be sprayed with 70% of dexamethasone 700 times in the result period. Without continuous cropping with melon crops can reduce the incidence of disease. Leafminer is a pest that severely harms melons and affects fruit development. In the flowering stage and the final flowering stage, spraying 1000 times liquid of Leshiben or 1000 times liquid of Haizheng Exterminator can achieve the purpose of prevention. 6 Properly harvested white melons are harvested for 25 to 35 days after flowering. At this point the flesh is soft, the fruit stems are easy to fall off, and the skin color turns yellow. In southern China during May-June, there are many hot and rainy days, and July-September is the typhoon season. Therefore, during the period of seed collection in June, the spring planting white guava should guarantee production quality, timely harvesting of melons, and prevention of rotten melons is the key; summer and autumn plants. When the white melons were harvested, it was during the typhoon season. Due to the poor resistance of the white melons, special attention should be paid to flood prevention and rowing so as not to pollinate the plants and cause serious pests and diseases. When the bitter water floods for more than 24 hours, the fruits are completely rotted. Harvest melons can be divided into 3-4 times according to the maturity of the melons. After the melons are harvested, put them in a cool, ventilated and dry place and ripen for 3-7 days. Take out the seeds and melons and place them in the wooden and tile pots for 12-24 hours. Rub them by hand to separate the seeds and the melons. After washing with clean water, put it in a dry and ventilated place to dry for 2-3 days, then dry it in the sun, and finally put it in a low-temperature dry place, which can be stored for 3-5 years. Generally, 2-4 seeds are collected per plant, and 667m2 can harvest seeds 20-30kg. Seeds oval, yellowish white, 1000-grain weight 16-17g. From: Changjiang vegetables
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