1 Select a well-drained field. The ripening period of the melon seeds coincides with the plum rain season in southern China. The phenomenon of rotten fruit is more serious. The use of high-pitched, ventilated plots to create deep trenches can reduce the rate of rotting and increase seed collection. the amount. At this time, the fruit enlargement period requires a large amount of water, and in case of drought, the seed field should be timely watered. 2 The sowing and planting of the male parent in Hangzhou area is 7-10 days earlier than that of the female parent. The sowing time of the early maturing variety is later than that of the late mature variety. The female parent is usually planted on March 5 and planted in the middle and mid-April. It is best to plant in the greenhouse. Avoid "hybrid" affect hybrid seed production and post-management. The female planting plant spacing is about 40cm, and the planting density is 2200 plants/667 square meters. The parental plant ratio is generally 1:5. The other management is the same as the cultivation of vegetables. 3 When the average temperature on the day of seed production rises to 20-25°C, it is suitable for seed production, and the Hangzhou region is in mid-May. In the period of time from when the first female flower appears in the plant to the beginning of the hybridization, the parental purity test should be performed according to the characteristics of the species, and different varieties and poorly growing plants should be removed to increase the purity of the hybrid seed. 4 Hybrid apparatus At present, the hybrid production of melons mainly uses manual hybridization. The main apparatus for the crossbreeding is 24# fine iron wire. This iron wire is made into a “U†ring with a circumference of about 4cm, which is used for card flower and hybrid markers. 5 Steps and methods of hybridization 5.1 Method One 5.1.1 Card flowering and collecting pollen The card is designed to prevent self- and non-purpose hybridization. The method is to open the female flower buds that will be opened the next day (select strong buds, and remove the first female flowers and the thin buds that will be opened), and use a thin wire to hold the crown in place, so that it cannot be left open. Unintended crosses or self-crosses by insects before unpollinated the following day. For each card, a thin wire is inserted on the leaf next to the flower bud for hybridization marking after the pollination is completed the next day. The pollen can be collected on the day before flowering and the parent buds of the next day's hybrids are caught in fine iron wire, taken off before flowering on the day of hybridization, used for pollination, and can be used to pollinate the male flower on the evening of the day before flowering. The buds are picked off, filled in a container for proper drying, pollinated the next day in an aquarium, and mixed with a brush to mix pollen for pollination. 5.1.2 When fertilizing and pollinating, remove the fine iron wire from the female flower's corolla, and use the male flower (extracted from the corolla) collected on the same day (or the previous day evening) to gently apply it on the stigma. Generally, a male flower grants 3-4 female flowers. , It can also be applied to the stigma by applying a mixture of pen powder and mixed pollen. After pollination, the original fine iron wire was still stuck in the corolla to prevent pollinators from entering pollens and reduce the purity of hybrid seeds. At the same time, the spare fine wire on the leaf next to the bud is placed on the stalk (not too tight) to show the hybridization mark. Pollination must use pollen that blooms on the same day. Pollination work is usually performed from 5:00 to 7:00 in the morning. 5.2 Method 2 The flowers of the melons are open at night, and pollen has a certain viability before opening. According to this feature, in the evening, buds are pollinated at the bud stage. This method saves pre-pollination work. That is, from 3:00 to 7:00 in the afternoon, when the male and female flower is in the bud, the male flower buds are taken off, the corolla is peeled off, or the mixed pollen is stained with a writing brush (collected on the evening of the previous day), and then the female flower buds are peeled off gently. Open and expose the stigma (don't peel off the petals) to pollinate. After pollination, the corolla was stuck with a thin wire and marked. 6 Adjustment of plants after pollination 6.1 Selection of preserved fruits and melons Leaves melons on the sun vines. It is advisable to leave 1-2 sticks for each plant. The reserved part is generally higher than lm to prevent melons from contacting the ground and rot. The site of implantation should be as consistent as possible. At the same time, at any time to check the fruit, timely removal of rotten fruit, fruit disease, dysplastic fruit. 6.2 After topping, pruning and fruit pollination, leave 2-3 leaves topping. The other invalid shoots were knocked out; old leaves and diseased leaves at the base of the plant were removed to enhance ventilation and light transmission; unfertilized flower buds and unhybridized fruits were removed, and were repeated every other day. This measure can not only prevent the results of unhybridized flowers, but also help the plants to fully supply nutrients to the hybrid fruit, promote the maturity of the melon, and increase the fullness of the seed. 7 Seed harvest When the seed rind becomes hard and the skin color becomes the inherent color of the old ripe melon, the melon can be harvested. The harvested melons should generally be placed in the room in accordance with their original conditions. After being cooked for a while, the cucurbits will be cut open with a blunt instrument (such as a kitchen knife), and the melon pods with the seeds will be placed in ceramic containers for fermentation. After 1-2 days of fermentation, the seeds can be washed out and stored dry. . Produce hybrid seeds 30-40kg/667 square meters. China Agricultural Network Editor
Disposable Suction And Irrigation Sets
A Disposable Suction Irrigator Kit is a medical device used during surgery to remove blood, debris, and other fluids from the surgical site. The kit usually includes a straw and rinse tube, both of which are disposable and designed to be used only once. Suction tubing is used to remove fluid from the surgical site, while irrigation tubing is used to introduce sterile saline or other solutions to the surgical site to help clean and irrigate the area. The single-use nature of the kit helps reduce the risk of infection and cross-contamination between patients.
Product features of disposable suction and irrigation equipment:
1. Dual functions of flushing and suction, one machine with multiple functions;
2. The flushing and suction functions are clearly distinguished, and the operation is simple, one-handed operation, convenient and fast;
3.Fully transparent pipeline design provides the best way for suction observation operation;
4.The front and rear ends are detachable, which facilitates the absorption of foreign bodies during the operation.
Disposable Suction And Irrigation Sets,Medical Suction And Irrigation System,Sterile Disposable Suction Sleeve,Medical Tube Suction Tube Set
Changzhou Weipu Medical Devices Co., Ltd. , https://www.cnweipumedical.com