Management techniques of spring radish in May

First, the management of spring radish should seriously eliminate the stagnant water in the field and reduce the soil moisture. Spring radish generally does not need to be watered during its growth, but only when the soil in the furrow turns white. The water demand of radish in the period of fleshy root expansion is larger, so it is best to use drip irrigation according to soil moisture. If furrow irrigation is used, it should be carried out at noon on a sunny day, half of the ditch water should be irrigated and drained 2 hours after irrigation. In order to ensure sufficient nutrients in the middle and later stage of radish growth, there were two times of topdressing. For the first time, about 30 days after sowing, most of the radish showed its shoulders, and the root was irrigated with 25 kg of compound fertilizer into 0.5% liquid fertilizer per mu, and the second time was about 45 days after sowing, the dosage was the same as the first time. The soil moisture is high, and topdressing can be applied at a distance of 10 cm from the radish root. Second, disease and pest control pests are mainly aphids and cabbage insects. Imidacloprid, insecticide and dichlorvos can be sprayed on the back of leaves alternately. The main diseases are downy mildew and black rot, which can be prevented by crop rotation and strengthening ventilation. Such as the use of medicament to prevent the disease, Kesha and mancozeb can be sprayed alternately on downy mildew, and agricultural streptomycin and copper preparations can be used to fill the root of black rot.