Spring rape planting technology

The early sowing of rapeseed in the open season is very important, sowing early, affected by the external low temperature conditions, it is easy to cause cold damage, rooting, rot, twitching phenomenon. Sowing too late will result in delayed listing, poor product quality (mainly due to high temperatures), and reduced economic income. Open field production is generally planted in late March and all live broadcasts are used. First, choose good varieties to choose high-quality, disease-resistant, high-yield, broth-resistant varieties, such as small green, Arima, Beijing Green 2, and so on. Second, the application of basal fertilizer Under normal circumstances, Mu Shi quality fully decomposed farmyard fertilizer 3000 ~ 5000 kg, 20 ~ 25 kg of diammonium phosphate, potassium sulfate 10 ~ 15 kg or 45% of the three yuan compound fertilizer 40 ~ 50 kg. Third, seed treatment Seeding before sowing the seeds in a well-lit place to dry for 3 to 4 hours, and then soak the seed in warm water at 50 °C for 20 to 30 minutes, then soaking in water at 20 °C ~ 30 °C for 2 to 3 hours, After drying, it can be directly sowed; or placed under 15°C~20°C for germination and 24 hours for budding. Fourth, fine sowing is generally planted in late March, about 350 grams of planting acres. Prior to sowing, depending on soil moisture, water will be cultivated and sowed until the water seeps. When sowing, 1 meter wide open 5 trenches, 1.5 to 2 cm deep, the seeds are evenly sown in the ditch. V. Field protection When the two true leaves are unfolded (2 leaves and 1 heart), the first time the seedlings, seedlings from 3 to 4 cm; 4 leaves 1 heart when the second time the seedlings (dust seedlings), seedling distance 8 to 10 cm About 40,000 seedlings are planted per acre. Less water is needed during the seedling stage. Normally, no drought or water is needed. After the seedlings are completed, they are watered for 3 to 4 times during the growth period. The watering should be performed in the sunny morning. About 15 days before the harvest, chase 1 fertilizer. Mushi urea 20-25 kg or ammonium sulfate 20 kg. Six, prevention and control of pests 1. Prevention and control of diseases. The diseases that can occur in spring rape are mainly sclerotiorum, downy mildew and black rot. Disease prevention and control should be promptly removed old leaf disease leaves, where the diseased leaf rate reached more than 10% can be used for pesticide control. Commonly used pesticides are: carbendazim, chlorothalonil, thiophanate methyl and others. Per acre spraying liquid 50 to 75 kg, the general medication 2 times, each interval of 5 to 7 days. 2. Control pests. The pests of rape mainly include aphids and leaf miners. If locusts are found, they should be promptly sprayed with 20% extinction or 2000 pounds or 2.5% puppet 1800 times. In the onset of a larvae harmed by leaf-fly larvae, 90% crystals of trichlorfon used 50-70 grams per acre, and 60 kg of water was sprayed and prevented. Seven, timely harvest spring rape exposed rapeseed general broadcast about 60 days after harvest can be listed. In the morning, the city will affect the production, and too late will affect the product quality.

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