In order to promote the early emergence of strong seedlings for overwintering rapeseed, we must focus on the following measures based on the application of base fertilizer, cultivation of strong seedlings, and timely transplanting.
Miao Dingmiao. Asked for 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. In the three-leaf stage, the seedling density will be determined according to the late sowing of the rapeseed, the age of the seedlings, and the growth condition of the seedlings, generally keeping the seedling distance at 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. Autumn and winter more drought, when the relative humidity of the soil (maximum field water capacity) is less than 70%, the lower leaves of the rape are red, the whole plant dark green luster, or wilting leaves at noon, should be immediately irrigated, drought-promoting early-onset. 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 the regional conditions. In autumn and winter and after returning green, it should be watered 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.
Rilled soil. The cultivating loose soil should master the principles of early soil loosening and ground loosening, and should be matched with measures such as fertilizing and rooting. The time, number, and depth of cultivating loose soil should be based on the growth of rape, soil conditions, climate characteristics and weed growth. For live rapeseed, two or three true leaves appear after the whole seedlings, and the first cultivator is combined with the seedlings and the top dressing. When there are 4 to 5 true leaves, the second cultivator is combined with the fixed seedlings and the top dressing, and then at low temperatures. Cultivate again before coming. For transplanting rapeseed, the first cultivator should be used in combination with topdressing after the seedlings are returned to green, and then cultivating one or two times before winter. In addition, after each watering and rainfall, cultivator loosening should also be carried out in due course. The depth of the cultivator should be shallow and deep first, avoid excessive rooting, that is, the first cultivator shallow, the second, the third cultivator deep. Paddy field can be slightly cultivated in rapeseed, prosperous rape cultivator should also be properly deepened, in order to cut off part of the root system, control the growth of aboveground parts, so that seedlings become strong seedlings. However, in winter when it is cold, it is generally not suitable for deep cultivating in order to prevent freezing and moisturizing. When cultivating loose soil, it is necessary to pay attention to the roots of cultivated earth to enhance the cold resistance of rapeseed.
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