How long is the live sowing rape suitable for sowing? The live rapeseed is simply that there is no need to go through the nursery stage when planting rapeseed, which has the advantages of labor saving and fast progress, and is also conducive to mechanized sowing. However, the rapeseed live broadcast requires high soil, and because the seeding rate is often too large, it is easy to cause seedlings and seedlings, which is very unfavorable for the harvest of rapeseed, so it is necessary to strengthen the field management.
1, to ensure timely early sowing, appropriate amount of sowing: live rapeseed suitable for sowing period is October 15-22, generally per acre of field seeding is 0.25-0.3kg. The field used for planting in the first 3 to 5 days before rice harvesting, due to the loss caused by mechanical operations such as rice harvesting and machine ditching, the rapeseed seeding rate can be appropriately increased to 0.3-0.4 kg per mu, and the seeding amount of rapeseed in late field is planted. It can be appropriately increased to 0.4kg per mu, while ensuring the density of rapeseed per acre is between 2.5 and 35,000.
2. When planting rapeseed, the seedling time (4 leaf stage) can be appropriately delayed according to the growth of rapeseed to prevent the winter from suffering from freezing damage. For the early broadcast of vigorous live rapeseed, the paclobutrazol control seedlings are generally used when the green leaves of rapeseed reach 4 leaves.
3, timely ditch, do a good job in the ditch system: the depth of the ditch is more than 30 cm, the depth of the ditch is more than 40 cm, the depth of the ditch is more than 60 cm, and the ditch cleaning should be strengthened to ensure smooth drainage.
4. Effective control of weed damage: For weeds, it is generally necessary to remove three times. The first pass is divided by monocotyledonous weeds, and the rice is used after harvesting. The second pass is divided by dicotyledonous weeds. The focus is on the cold-tailed cold head, and the rapeseed is carried out in the 4~5 leaf stage; the third time, the single-dimension and the double-leaf weed are taken into consideration, and the average daily temperature is higher than 5 °C after the spring of the next year.
5. Scientific operation of fertilizer: 15 to 16 kg of pure nitrogen per acre, and N:P:K ratio 1:0.34:0.39. Before and after the cold weather, the fertilizer is applied 7.5~10 kg per mu. The fertilizer is 7.5~10 kg per mu in advance to the bud stage.
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