At the moment, it is the golden season of rapeseed breeding. How to cultivate good seedlings and seedlings, the author introduced that the emergence of the following five types of seedlings must be prevented. The tall plantlets of tall feet are the most common and most easily formed abnormal seedlings in rapeseed beds. The main reason for the formation of tall seedlings is that the seeding volume is too large, the fertilizer and water are too much, and the seedling age is too long. As a result, the main stem has been elongated in the seedbed, and the early and mid-maturing varieties are particularly serious. This kind of seedlings is easy to fall after transplanting into the field, easy to leave the leaves and expose the neck. Once it encounters the cold current, the stems are easily frozen and cracked, which will lead to high branches and high yields. Therefore, there is a tendency to grow crops in due course. The seedlings are sprayed with paclobutrazol at the 3-leaf stage, generally using 15% paclobutrazol per acre for 50 grams, spraying 40-50 kilograms of water, which can prevent tall seedlings formed in the rape field. Too early to plant the seedlings too early after the temperature is too high, the leaf growth rate is fast, the seedlings are too long and vulnerable to cold damage due to winter; too late sowing, the temperature is low, the leaf speed is slow, unfavorable autumn and winter strong. Excessive seedlings occur when the available nitrogen fertilizer is applied excessively, the temperature is high and the humidity is relatively high, which easily leads to an overwhelming growth and the formation of leggy seedlings. As the growing trend is strong, the organization is tender, and the resistance is not strong. After transplanting into Daejeon, the leaves often wither a lot, turning green slowly, making seedlings late, and being susceptible to freezing, which is not conducive to strong winter spring hair. The prevention method is proper sowing and control. Fertilizer and time seedlings, Dingmiao. For seedlings with prosperous tendencies, a 50-100 ppm Chlorellas spray can be used for 4 leaves and 1 heart. The thin and thin seedlings are mainly caused by seedbed conditions. The seedbeds are crowded and shaded and the light is insufficient. The growth is thin, and the chlorophyll is less. The prevention method is to prepare enough seedbeds. Generally, the seedbed should occupy about 20% of the planting area, and the seedbed fertility should be selected, and the texture is loose. Drainage and irrigation are convenient. After emergence and time seedlings, seedlings can not emerge seedlings, seedlings can be set at the 3 leaf stage, once each seedlings, should be poured once the fertilizer and water to benefit strong seedlings. The dwarf plantlet is also called stiff seedling, mainly due to the slim soil on the seedbed, the insufficient supply of fertilizer and water, or the long-term waterlogging of the seedbed, poor root development, or late sowing. The seedling growth in the seedbed is insufficient and is also caused by the low temperature of the cold wave. The seedlings have short stems, fine roots and necks, few leaves, small and short leaves, and low chlorophyll content. As a result, photosynthesis is weak, growth is stagnant, and the leaf color is red. After transplanting, it is difficult to turn blue hair, and it does not reach winter. Strong spring production requires high yields and low yields. The prevention method is suitable for seedling age, and 35-40 days is appropriate for seedlings of early and mid-maturing varieties to prevent drought and prevent flooding. This prevents the development of seedlings from being impeded by drought and prevents the development of seedlings, resulting in the formation of sterile seedlings, insufficient seed bed base fertilizer and seedbed growth. In the period of severe shortage of fertilizer and water supply, it is necessary to promptly spray fertilizer on the leaves or topdressing the soil in order to make up for lack of land and promote rapid growth. Canned Tuna,Fresh Canned Tuna,Frozen Canned Tuna,Canned Skipjack Chunk ZHEJIANG RETRONX FOODSTUFF INDUSTRY CO.,LTD , https://www.retronxfoods.com