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. Early seedlings, uniform seedlings, timely Dingmiao to prevent rape "high feet seedlings" and "Qujing seedlings" to improve the quality of rapeseed seedlings, when the rape leaf appears 1-2 leaves, to master the principles of five to five stay seedlings, that is, "to the dense Stay sparse, stay small and stay strong, stay weak and stay strong, go to the sick, stay healthy, and stay pure." The three-leaf stage will be set in time and seedlings will be planted with 5-6 million seedlings per acre seedbed, and 1 mu seedbed will be planted with 5 mu of Daejeon. As early as the Miao Miao Qimiao combined with thinning seedlings, Dingmiao, topdressing thin manure, keeping the seedbed moist, to meet the needs of fertilizer and water at the seedling stage, with urea 4.5 kg per mu, 400-500 kg of water applied, promote vigorously leaf pumping The topdressing is applied 5-7 days before transplanting to germinate new roots, ensure survival after transplanting, and shorten the period of seedlings in Daejeon. 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. Dwarf treatment, adding boron fertilizer: 15 g per acre with 15% paclobutrazol (if the use of 25% high-efficiency azole can be halved), 75 kg of water spray, with a solid dwarfed plant shape, under control to 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, one or two sprays of 0.1%-0.2% borax aqueous solution must be applied after seedling and before transplanting (can be carried out simultaneously with the dwarfing treatment, but it must be followed with mixing). After 4 leaves, seedlings and hardening seedlings are used to prevent excessive nitrogen fertilizer. Timely prevention and control of pests and diseases in rape seedlings mainly includes downy mildew, cabbage caterpillar, aphid, beetle beetle and diamondback moth. Mu 40% carbendazim 100 grams 100 pounds of water spray to prevent downy mildew. Use 100 grams of omethoate or 50 milliliters of deltamethrin or 50 milliliters of the insecticide or 80 milliliters of enemies to spray 100 pounds of water, and control cabbage caterpillars, aphids, beetles, and diamondback moths. The chemical weed seedling bed is small, except for manual extraction. Before the first and second year weeds are used for 2-6 leaves, we can use 10.8% of the effective herbicides, 25 ml per mu, or 5 ml of the 50 ml fine grass, or Steady and stable to kill 50 ml, respectively 40-50 kg of water directed spray. Disposable Surgical Mask For Children
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