Breeding techniques for summer propagation of peppermint

1. Choose a good breed. The varieties with strong growth, strong disease resistance, high brain content and pure fragrance should be selected in summer propagation breeding of peppermint. Asia 39 and Fuyou 1 are generally selected. two。 Breeding time. Generally speaking, the growth of mint in the first crop goes into the flower bud stage. The south is around June and the north is around July. 3. Prepare the ground. Select fields with high terrain, good drainage, deep soil layer, loose and fertile fields, sandy loam is better, intensive cultivation. Combined with soil preparation, apply sufficient base fertilizer, apply soil miscellaneous fertilizer 3000~5000kg and nitrogen, phosphorus and potassium compound fertilizer 50kg every 667m2. 4. Breeding methods. ① cuttage propagation. The stalks of mint from the first stubble were cut into long segments of 30cm, and were planted on the whole border surface according to row and plant spacing 30cm × 5cm. ② rhizome propagation. After the first mint harvest, the underground rhizomes were planed and planted according to row and plant spacing 30cm × 5cm. 5. Field management. ① watering. After mint planting, the soil moisture should be maintained and should be watered frequently to facilitate the rooting and emergence of mint. ② weed control. Before emergence of mint, 100 g 60kg of herbicide to water was sprayed evenly on mint field, which could effectively control many kinds of weeds. After peppermint seedlings, the weeds that have not been removed can be removed manually. ③ topdressing. Every 667 square meters, 100 g peppermint yield increasing agent was sprayed evenly into 300 times solution. Spray once every 10 days, three times in a row. When peppermint seedlings were high 10cm, topdressing once. Urea 10kg and potassium dihydrogen phosphate 5kg were topdressing every 667m2. ④ pest control. The main diseases of mint are spot blight, rust and so on, which can be controlled by conventional methods at the initial stage of the disease. 6. Harvest. Mint can be harvested when it grows in late October. First cut off the aboveground stems and leaves, and then dig out the underground stems to carry out propagation and planting.