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Natural breeding of silkworm
The natural breeding of silkworm is to build a simple silkworm house in the mulberry garden, allowing the silkworm to feed on the mulberry tree directly and grow and develop. Under good conditions of light, temperature, humidity and ventilation, the yield of mulberry leaves per acre is as high as 2000-2500 kg, and the yield is increased by 20%. The output of mulberry per acre is as high as 100-150 kg, and the yield is increased by 50%. The quality of cocoon also has Greatly improved. Build a simple greenhouse with steel, steel, multi-purpose longevity plastic film, plastic film, shade net, insect nets and other materials to build greenhouses and elevated shed. The plastic greenhouse is 6 meters wide, 30 meters long and 1.6-2 meters high on the shoulder. The roof is covered with plastic film and shade net. The shed is 4-5 meters high, 8-10 meters wide and 34-36 meters long. Put shade nets. The cultivation and management of mulberry trees selected mulberry mulberry varieties with early growth, multiple cultivars, straight shoots, dense internodes, and large fleshy leaves, according to a plant spacing of 50 cm and a row spacing of 67 cm per mu. The adoption of horizontal sticking of green branches and multiple methods of picking up the hearts of the mulberry tree quickly promoted the growth of mulberry trees and formed a high-yield group. The mulberry grows into a low-dry tree with a trunk height of 4-6 meters. According to different cutting and harvesting technical requirements, 2 cuttings per year will be made and 3 mulberry leaves will be harvested. The method of fertilization and pest control is the same as the conventional management of mulberry fields. In early March, the greenhouses were covered with multi-functional plastic films and removed to the end of the summer silkworm production. In mid-June to late August, high temperature conditions above 30°C occurred, and 1-2 layers of shade nets were placed above the elevated sheds. At the end of August and early September, plastic film and 2-6 shade nets were placed above the greenhouse to feed the young silkworms. From October to early March, we plant medium and high-grade vegetables in the shed. Digging wells outside the shed and installing pipes inside the shed to divert water and resist drought. In the shed, small silkworms were placed on the outside of the greenhouse and covered with insect-proof nets with a height of l-1.5 meters. The ground was completely covered with plastic film. According to the requirement of leaf quality for various ages of small silkworms, the silkworm frame (can move up and down) of bamboo and bamboo structure is placed between the mulberry strains, and the silkworm frame is fixed at both ends, and the frame is closely attached to the frame to form a three-dimensional silkworm silk table. Or silk seats. The silkworm box has a width of 49 cm and a length of 133 cm. The box covers 1-2 layers of silk nets. The silkworm eggs that have been soaked are retrieved five days before receiving the ants, and are distributed in six silkworm boxes (6 silkworm boxes per silkworm species) and heated to 24-25°C. After receiving the ants, the silkworm frame is placed in the mulberry strains. After the mulberry has been picked up, the new shoots are pushed down horizontally until the mulberry leaves cling to the silkworm frame and the new shoots are tied tight with a string, allowing the silkworms to climb onto the mulberry leaves for feeding. After the silkworm enters the 3rd age, the silkworm frame is moved down to 20-30 cm from the ground. During the rearing period, fumes, sprays, dusting, etc. are alternately used to disinfect and prevent diseases, and the temperature and humidity are properly adjusted. Ventilation and ventilation are performed at appropriate times, and the head density is adjusted. When the small silkworms 3 or before 3 sleeps, the mulberry leaves on the mulberry trees are basically eaten, and the small silkworms should be dispersed to the farmers to feed the silkworms in time. The silkworm reared in the shed is supported by saplings near the main frame, and two-dimensional serigraphy (or silkworm pedestal) with a width of 1.33 meters, a height of 0.3-0.4 meters, and a length of 30 meters are respectively set up. The upper layer of the silkworm platform is tilted to set a plastic film compartment to exclude silkworm feces. From the 4th day of the fifth instar silkworm, 40% of the silkworms were uniformly moved to the upper layer of silkworm rearing. Both the upper and lower layers are mulberry erected. The mulberry is 20-30 cm long and is sent back to Mulberry Sang all day. In the shed, the first cluster extracts 15%-20% of the mature silkworm larvae, then sprays ecdysone on the silkworm body, adds a layer of mulberry leaves, and then puts a cardboard grid cluster or pupa to allow the silkworm to automatically camp on the larvae. cocoon. Cluster management measures are the same as conventional. Silkworm rearing sheds are bred three times a year: from April 28 to May 25 in the spring silkworm, from June 25 to July 15 in the summer silkworm, and from September 5 to October 15 in the autumn silkworm.