When Baiyuchun radish is planted in the spring, if the technique is not proper, it will easily produce "black skin" and "black heart" phenomenon, which will cause the radish to lose part or all of its merchandise. Prevention and treatment of spring radish “black skin†and “black heart†is one of the important technologies for spring radish. First, the reasons for the first cause is the lack of boron in sandy loam, the second is the waterlogging or lack of oxygen in the soil, and the third is black rot. Second, the response measures take different prevention measures for the different causes. 1. Adding boron fertilizer to sandy loam. 667 square meters (1 mu) is applied with 1 kg of boron fertilizer, which is applied together with other fertilizers as base fertilizer, or sprayed with 0.2%-0.3% boric acid solution 1-2 times during the middle period of growing radish. 2, deep ditch sorghum, diligent cultivator weeding, apply more organic fertilizer to prevent soil compaction. 3. Avoid continuous cropping with cruciferous vegetables. 4. Disinfect the soil before sowing, use 72% of agricultural streptomycin sulfate wettable powder 4000 times of solution or 14% of ammonia solution of copper emulsion 300 times of spraying every 3-7 days, spraying continuously for 3-4 times. Times.
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