Waterlogging is also called "wet damage". Continued rainfall will cause stagnant water, especially when the water and drought are used as rape fields. In view of the characteristics of rapeseed waterlogging, the following technical measures for rapeseed waterlogging prevention and control were proposed:
Drain the ditch and dig the main ditch and the ditch, and improve the ditch system, and strive to make the main and branch ditch unobstructed. After the end of the rainy weather, it is necessary to timely drain and drain the water, so that the main ditch, the furrow, the trench and the ditch are connected, and the drainage is smooth, so that the rain can live in the field and reduce the humidity in the field. After the weather turns fine, it is necessary to carry out cultivating loose soil in time, control weeds, improve soil ventilation, and promote root development.
Replenishing quick-acting fertilizer damage will lead to the loss of soil nutrients, and the nutrient absorption capacity of roots will decrease. At this time, according to the growth of seedling stage, 4-6 kg of urea should be applied per acre to promote the growth before winter. On the basis of topdressing nitrogen fertilizer, it is necessary to apply appropriate amount of phosphorus and potassium fertilizer to increase plant resistance. Apply 3 to 4 kg of potassium chloride per mu or 0.2% potassium dihydrogen phosphate solution or 2% to 3% of roots. 50 kg of aqueous calcium phosphate solution. In addition, after the bud, the application of boron fertilizer once, that is, the use of 50% of 0.1% to 0.2% of the boron fertilizer solution for foliar spraying, to prevent "flowers and false."
The roots of the soil will prevent the development of the underground parts from being damaged after the waterlogging of the oily rape. In the middle and later stages, it may be “top-heavyâ€. Therefore, after the spring, it should be surrounded by the roots of the leaves, on the basis of cultivating the loose soil and cultivating the roots. After the plot with a prosperous trend, the growth regulator should be sprayed once in the flood season, usually with 15% paclobutrazol 50g plus 50kg per acre to improve the plant type and enhance the lodging resistance.
Prevention and treatment of secondary disasters should pay attention to prevent the occurrence of secondary diseases. In the field where waterlogging occurs, it is prone to downy mildew under low temperature and high humidity conditions, and is susceptible to sclerotial disease under high temperature and high humidity conditions, and has a clubroot disease. Wait. In this case, the yellow old diseased leaves at the bottom of the plant should be removed in time to reduce the bacterial source of Sclerotinia sclerotiorum; choose to spray 2-3 times more frequently on the sunny day, or kill the disease, or thiophanate, or mancozeb. prevention. For the field where the cabbage caterpillar is harmful, it can be controlled by alternating spraying of avermectin emulsifiable concentrate or kovufrin emulsifiable concentrate, and it can also be controlled by pyrethroid insecticides. For the field where the aphids are harmful, it can be controlled with a dimethoate emulsion or an imidacloprid wettable powder or an imidacloprid emulsifiable concentrate.
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