In the winter, the township of rapeseeds in my town has a large area for planting, but some farmer households do not manage well and their seedlings are not balanced. According to a recent field survey, a handful of rapeseed were subjected to freezing, laying a good foundation for the rape harvest, and the following management measures were proposed:
1. Prevention and cure of rape damage
Mainly in the leaves, Lei Xue frozen, and even the roots were frozen, some appeared early moss phenomenon. After freezing, when the temperature rises and stabilizes, timely management of field management and top-dressing of the moss fertilizer will increase the number of branches and buds and make up for the effects of freezing. Due to the excessive application of nitrogenous fertilizer, rape grows green, mu is sprayed with 0.2-0.4% potassium dihydrogen phosphate solution + 0.2% boron fertilizer solution and sprayed twice, once for 7 days. For rape, which is relatively thin and weak, 0.5 to 1.5% of urea is used for spraying, spraying twice, once every 7 days.
2. Strengthen field management
(1) Do a good job of drainage work to reduce the humidity in the field.
(2) Remove the weeds from the fields, remove the diseased, old, yellow leaves from the plants and bring them out of the field for centralized treatment, so as to reduce the number of pathogenic and disease sources.
3. Pest control
(1) Locust: 20 acres of 2% pymetrozine and 30-40 kg of water were sprayed.
(2) Pieris rapae: Should be mastered in the larvae of 1-2 instar larvae, mu 20% avermectin 30-40 grams, watered 30-40 kg spray.
(3) Downy mildew: When the diseased strain rate reaches about 10%, 58% metalaxyl manganese zinc 100g to 150g per acre, watering 40 to 45 kg spray, 7 days once, and even spray twice.
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