On the basis of applying basic fertilizer, cultivating strong seedlings, and timely transplanting, the following measures shall be taken in focus:
Miao Dingmiao. To early seedlings, dilute seedlings. The principle of mastering is to stay thin and thin, stay weak and strong, and adjust the distance between the plants to maintain uniformity. Usually two sub-seedlings, the first time when the first true leaf appears after the seedlings, the leaves do not overlap between the leaves; the second time the seedlings in the second true leaf occurs. At the third leaf stage, the seedlings were planted. The density of seedlings was determined according to the late sowing of the rapeseed, the length of the seedlings, and the growth condition of the seedlings. Generally, the seedling distance was kept 7 to 10 cm. A small amount of seed can be planted only once.
Early application, Shizuo Miao. Tests have shown that 15 days of nitrogen deficiency at seedling stage or 25 days of phosphorus deficiency will reduce the yield of rapeseed by 27.4% and 27.1%, respectively. After 5 days of transplanting, top dressing will increase yield by 24.3% per acre over 20 days after transplanting. In dry areas and years, fertilization should be carried out in combination with watering, that is, top dressing with water and fertilizer with water. The amount of fertilizer used at the seedling stage should account for about 40% of the total amount of fertilizer. On the basis of applying base fertilizer, topdressing nitrogen fertilizer such as urea twice. For transplanting rapeseed, in addition to topdressing nitrogen fertilizer twice, topdressing with wax fertilizer should also be followed. For live rapeseed, the fertilizer should be top-dressed once during the first time and after the first seedlings. In addition to topdressing N fertilizers, it is also necessary to pay attention to topdressing phosphate fertilizers. Phosphorus deficiency can affect flower bud differentiation and root development. In addition, attention should be paid to the supply of boron fertilizer during the seedling stage.
Drought resistant drainage. The winter rains in China's rapeseed production areas are especially in the Huang-Huai District and the middle reaches of the Yangtze River. Autumn and winter are more arid. When the relative humidity of the soil (maximum water holding capacity in the field) is less than 70%, the lower leaves of the rape are red, the whole plant is dull green, or the noon leaves are wilting, and irrigation should be carried out immediately to promote early drought resistance. When the drought is light, it can be combined with straw seedlings and watered to resist drought. When the drought is severe, furrow irrigation can be carried out. The number of waterings should be based on the seedling condition and the soil texture. It also depends on regional conditions, such as Huanghuai rape production area, in the autumn and winter and return to green water 5 to 6 times. When flooding, avoid flood irrigation, so as to avoid flooding rape, soil compaction, affecting the development of the roots, the formation of stiff seedlings does not occur. In areas with a lot of autumn rain, it is necessary to pay attention to the drainage of drains and reduce the water table.
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