The cultivars in Tibet are mainly cabbage (also known as canola). In recent years, Lhasa, Shannan, Nyingchi, Qamdo, and other areas of the valley have raised the cultivation of high-quality spring rape of cabbage type, and the development rate is faster. The varieties are mainly Cangyou No. 5, Shanyou No. 2 and some imported varieties and other low-grade varieties. rape. The cultivation method is different from that of ordinary rapeseed and should be paid attention to in production.

Environmental conditions: We choose a low-altitude rapeseed production base with the advantages of flat terrain, convenient irrigation, relatively centralized production, and regional planting advantages, and implement contiguous planting. In order to prevent pollinator contamination and excessive erucic acid and glucosinolates, it must be isolated from “double high” rape and other cruciferous crops.

Rotational cropping: Two-year cropping system is practiced. Breeding with crucifer crops is prohibited. This will not only reduce the number of diseases, insects and grasses, but also increase the purity and yield of double-low rapeseed. For the double-low rapeseed, it is best to use leguminous or wheat crops to avoid sowing canola crops within a three-year period when the high-yield canola or cruciferous vegetables are left in the fields.

Land selection and fine soil preparation: Planting farmland should be characterized by loose texture, fertile soil and heavy sand masses. Alkaline soils and excessive dryness and humidity are not conducive to the improvement of the emergence rate. Before the spring plowing, sow planting water. When the soil moisture content is suitable, farmland will be cultivated and cultivated to facilitate emergence.

Scientific fertilization: Generally, 1,000 to 2,000 kilograms of organic fertilizer such as Mushi sheep and cow dung, 10 to 15 kilograms of compound fertilizer, and 3 kilograms of urea are used as base fertilizers. At the same time, early application of Miaofei, that is, in the second seedlings, clover seedlings topdressing 7 to 10 kg of urea, and budding bolting topdressing the same amount of urea (7 to 10 kg).

Early time sowing: Appropriate early sowing, prolong the growth period, in order to facilitate the formation of strong seedlings, lay a good foundation for high yield. Therefore, the double-low Brassica napus in the main river valley in our district is suitable for sowing date between April 1 and April 15. It is unfavorable for the normal growth of rapeseed, too early and too late, and has a great impact on the yield.

Planting methods: At present, in the absence of a special planter for rapeseed, a seven-row or five-row planter for wheat is planted. The specific method is to sow the planter to block one line and leave one line at a row spacing of 30 centimeters. The sowing volume is 0.7 to 1 kilogram. At the same time, the seeds and urea are mixed evenly and then drilled so that the effect of applying seed fertilizer can be achieved on the basis of uniform sowing, thereby laying a good foundation for high yield.

Reasonable dense planting: generally grow 2 to 3 true leaves in rape and time seedlings, Dingmiao. Between the plexus seedlings, tall seedlings, weak seedlings, row spacing is generally about 30 cm, plant spacing is generally about 10 to 15 cm, the number of acres is generally 1.5 to 25,000, so that the groups and individuals to coordinate with each other, is conducive to high yields.

Reasonable irrigation: The demand for spring oilseed rape is generally less in the early period, more in the medium period and less in the later period. Therefore, it is required that there be less irrigation at the seedling stage, and the irrigation period should be increased to the full length of water from the bolting period to the full bloom, and the number of irrigations and the amount of irrigation should be reduced.

Field Management: Grasping early soil weeding, early seedlings and seedlings, and early top dressing are the core of field technology. Generally, weeding and weeding begin when the seedlings are present, which can reduce the damage of weeds, loosen the soil, increase the temperature of the ground, and promote the release of nutrients, creating favorable conditions for the cultivation of strong seedlings. The depth of cultivating and weeding is based on the principle of shallow depth first.

Prevention of pests and diseases: Insect pests in spring rape are severe and the disease is light, mainly due to aphid damage. Aphids begin to occur at the seedling stage, and flowering results in serious damage. The use of rapid extinguishment to kill or make a great effort to spray 1 to 2 times the effect is significant.

Timely harvest: The mature characteristics of spring rape are leaves wilting and detachment. The pods of stalks are yellow-green or purplish red. The seeds in the middle and upper pods harden. In order to reduce the cracking of fruit splits, when more than 80% of the fruits in the field turn yellow, they are harvested. The harvest time is harvested in the morning and evening when there is moisture, stacked 7 to 15 days after harvesting, and then dried and threshed, which is beneficial to increase production and income.

FFP2 Protective Half Mask

FFP2 Protective Half Mask,FFP2 Earloop Half Face Mask,Half Particulate Respirator,Disposable FFP2 Filtering Half Mask

Henan Aklly Filter Engineering Co., Ltd , https://www.akllyfilter.com