The screw system contains cortical screw, cancellous screw and Cannulated Screw. Torx and Hex pattern are available. The material is Alloy Titanium or Stainless Steel. The screw use asymmery thread to increase the holding force. Locking screw use four-thread design for quick screw fixing. The screw has self-taping and self-drilling features.
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Bone Screw Bone Screw,Orthopedic Bone Screws,Cortical Screws,Cannulated Screw Shandong Hangwei Orthopedics Medcial Instrument Co., Ltd. , https://www.hangweimedical.com
1, early seedlings, uniform seedlings, timely Dingmiao: In order to prevent rape "high feet seedlings" and "Qujing seedlings" and improve the quality of rape seedlings, when the rape leaf appears 1-2 leaves, to master the principle of five to five stay seedlings, namely "To stay in thin and thin, to stay small to stay strong, to stay weak and strong, to stay sick to stay healthy, to leave the pure." The three-leaf stage will be set in time, leaving 50,000-60,000 seedlings per acre seedbed, and a 1-mu seedbed planted with 5 mu of Daejeon.
2, early recovery Miao Fei: Qi Miao combined with thinning, Dingmiao, topdressing thin manure, keeping the seedbed moist, to meet the needs of fertilizer and water seedling period, with urea per acre 4.5 kg, 400 ~ 500 kg of water splash, promote The leaves were vigorously plucked; topdressing was conducted 5 to 7 days before transplanting to germinate new roots, ensure survival after transplanting, and shorten the period of seedlings in the field. In case of autumn and rain, it is necessary to strictly control the fertilizer and water, prevent the formation of blisters, and avoid freezing damage in winter.
3, dwarfing treatment, adding boron fertilizer: Dingzao with 15% paclobutrazol 15 g per mu (if the use of 25% high-efficiency azole can be reduced by half), water spray of 75 kg, in order to dwarf pier real plant shape, control Promote, enhance resistance. Late treatments of rape and three types of seedlings may not be carried out. Rape seedlings are more sensitive to boron, if the lack of boron not only affect the flower bud differentiation, resulting in "flowers but not real" after the year, and the application of boron fertilizer at bud stage, it is difficult to make up for the loss caused by boron deficiency at seedling stage. Therefore, after doubling seedlings and before transplanting, it must be sprayed with 0.1% to 0.2% borax aqueous solution one or two times (can be carried out in parallel with the dwarfing treatment, but it must be used with the mixture). After 4 leaves, seedlings and hardening seedlings are used to prevent excessive nitrogen fertilizer.
4, timely control of pests and diseases: Rape seedling pests and diseases mainly include downy mildew, cabbage caterpillars, aphids, beetles and diamondback moth. Mu 40% carbendazim 100 g watered 100 kg spray to prevent downy mildew. Mu with omethoate 100 grams or 50 milliliters of deltamethrin or 50 milliliters of the insecticidal king or enemy killed 80 milliliters of watered 100 pounds of spray, control of cabbage caterpillars, aphids, beetles and diamondback moth.
5, chemical weeding: oil seedling bed is small, except for manual extraction, before the first and second year of grass weeds 2 to 6 leaves, before each acre with 10.8% efficient cover grasshopper 25 ml, or 50% fine grass grass grams 50 Milliliters, or 50 milliliters of fine steadily killed, 40 to 50 kilograms of water directed spray.
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Seedling Management Techniques of Transplanting Rape Seedlings
Rapeseed is the main oil crop in Chongqing's Hanjiang District. The annual planting area is more than 100,000 mu and the total output is about 9.5 million kg. At present, from the field investigations, there are generally some problems in the management of nursery beds that are not properly handled. Now we have proposed the following specific measures on how to strengthen seedbed management.