L, rhizome propagation. The culture of seed roots is carried out in late April or late August. In the field, plants with strong growth and no diseases and insect pests are selected as mother plants and planted at the row spacing of 20× 10cm. After harvesting the stems and leaves on the ground in early winter, the rhizomes are left in place as seed plants.

2. Propagation by ramets. The height of mint seedlings is about 15cm, so it is suitable for interplanting and replanting. Transplanting by dividing seedlings.

3. Cutting propagation. In May and June, the above-ground stems and branches were cut into cuttings with the length of 10cm. On the whole seedbed, cuttage was carried out according to the row spacing of 7×3cm, and after rooting and germination, it was transplanted to the field for cultivation.

Second, transplantation.

1. mint should be transplanted before germination in early spring of the following year, planted early and germinated early, with long growth period and high yield. When planting, the rhizome is dug up, and the rhizome with thick, short and disease-free internodes is selected as the seed root, which is cut into 7- 10 cm long segments, and then the border is cut into 10 cm deep according to the row spacing of 25cm in the whole border. The seed roots are obliquely placed in the ditch according to the plant spacing of 10cm, covered with fine soil, compacted and watered.

2. Pick the top. When the plants grow vigorously in May, the top buds should be picked in time to promote the growth of branches and leaves, which is conducive to increasing production.

Third, the management of the first cutting period (from emergence to first harvest)

1. After the seedlings are basically completed in the field, they should be inspected in time, and missing or sparse points and pieces should be replanted.

2. intertillage weeding. After the whole seedling, intertillage weeding and artificial weeding between plants are carried out to keep water, raise the temperature, eliminate weeds and promote the growth of seedlings. Tillage and weeding for 2-3 times before enclosure. Pull out weeds in the field before harvesting to prevent the smell of other weeds from affecting the quality of peppermint oil.

3. timely topdressing. When the seedling height is 10- 15 cm, ditching and topdressing should be carried out, and urea 10 kg should be applied per mu. After closed discharge, spray 5ml of Bao+potassium dihydrogen phosphate 150g+ urea 150g twice.

4. Use water scientifically. Mint needs more water in the early and middle stages, especially in the early growth stage, when the root system has not yet formed, so it needs more water. Generally, it needs to be watered once every 15 days, and it needs to be watered 4-5 times from emergence to harvest. After the warehouse is closed, it should be watered lightly to prevent the stems and leaves from growing and lodging, causing the lower leaves to fall off and reducing the yield. Stop water 20-25 days before harvest. When harvesting, "whitewash" the ground.

5. Disease control. The main disease of mint is black shank disease, which occurs at seedling stage. Symptoms are contraction and depression of stem base, blackening, rot, lodging and withering of plants. 70% chlorothalonil or 40% carbendazim can be sprayed during the outbreak period (100- 150g).

Peppermint rust is easy to occur from May to July, and spraying 25% triadimefon 1000- 1500 times liquid leaves.

65438+ 10 occurred in May-June, and it can be controlled by spraying 65% zineb 500 times solution/kloc-0 once a week at the initial stage of the disease.

6. Pest control. The main pest of mint is "bridge builder", and the damage period is around mid-June and late August. The general population density is 10 head /m2, which can kill 15-20ml per mu, spray 1-2 times, or spray 80% dichlorvos 1000 times.

7. Harvest at the right time. At the beginning of July, when the main stem of mint 10-30% buds are in full bloom, the harvest begins. When harvesting, the upper stems and leaves should be cut evenly, and the cut mint should be spread out and dried immediately to avoid fermentation. Early harvest of mint will reduce the oil yield, while late harvest will increase the furan content in mint and affect the quality of oil. The withered mint is packed in time for distillation and oil refining.

Four, two knife period management (after the first harvest to the second harvest)

1. In the second mowing stage, the growth period of mint is short. After the first mowing, the fallen leaves should be cleaned in time for distillation and refining. The stubble, weeds and stolons on the ground should be hoed as soon as possible (generally, the depth of hoeing is 2-3 cm) to promote the shoots of-TJ seedlings from the roots.

2. Water the stubble immediately after hoeing to make the seedlings grow early and quickly, prolong the growth time and increase the yield. Water for 3-4 times in the second mowing period, and when the seedling height is 10- 15cm, apply urea 10 kg per mu (ditch), topdressing the leaves 1-2 times, and pull up weeds 1-2 times before harvesting.

Verb (abbreviation for verb) harvest

1. The harvesting time is from mid-September to mid-June.

2. When the sun is 70% to 80% dry, tie it into small pieces and dry it completely. Dry leaves, dark green leaves, purple-brown or light green stems, and strong aroma is preferred.