First, raise seedlings. Because the seeds of Andrographis paniculata are small, and the ability of seedlings to be unearthed is poor, it is necessary to turn the seedbed deeply for 2-3 times, break the clods, then remove the border, apply 200 kilograms of fully fermented and decomposed manure to every 30 square meters of seedbed, fully mix the manure with the soil, and then level the border. Sowing time should be chosen around Tomb-Sweeping Day. Before sowing, the seeds should be soaked in warm water at 40-45℃ for 65,438 0-2 days (or the seed coat should be scraped off by dressing with fine sand). When sowing, the seeds should be picked up, mixed with plant ash, spread on the seedbed, and then covered with a layer of fine soil about 3 mm thick, and then sprayed with clear water by a sprayer to make the soil moist. After sowing, cover with agricultural film, and then cover with a layer of straw to keep warm and moist. The appropriate sowing amount is 50-60g per 30m2 seedbed (1-2mu field can be planted and cultivated). When 50%-70% of seedlings germinate, the agricultural film and straw attached to the ground should be removed in time, combined with watering after emergence, and diluted manure water should be sprayed every 7 days to promote the rapid growth of seedlings.

Second, field soil preparation. Before transplanting, hilly or flat land with soil ph value of 5.6-7.4, flat terrain, leeward and sunny, fertile and loose, and convenient irrigation and drainage is selected as the transplanting place. Dig deep into the field, apply 2000 kilograms of decomposed pig cow dung and 20 kilograms of calcium magnesium phosphate fertilizer as base fertilizer per mu, then harrow to make ridges with a width of 120- 130 cm and a height of 15-20 cm, and open drains with a depth of 30 cm around the field.

Third, transplant planting. After 1 month sowing and seedling raising, the seedling height is 10 cm, and it can be transplanted to the planting place when there are 4-5 pairs of true leaves. 65,438+0 days before transplanting, the nursery should be watered thoroughly, and strong seedlings should be selected from the seedbed and transplanted with soil. The planting row spacing is about 20×20 cm, and 65438+200,000 plants should be planted per mu. After transplanting seedlings 1 week, light manure water can be poured once to promote fixed root growth.

Fourth, on-site management. First, we must do a good job in water control. Andrographis paniculata likes dampness and fears drought, and is sensitive to water. It should always be wet, but it should not be too wet. The key point of seedling management is to keep the border moist. Water 1-2 times a day without rain after transplanting; After delayed emergence, it is still necessary to keep the ground moist and water it every 3-7 days 1 time. The second is to do a good job of topdressing. The production of andrographis paniculata needs a lot of nitrogen fertilizer, so it must be topdressing in time. Generally, it needs topdressing 3 times. After delayed emergence, 3000 kg of human manure diluted with water or 10 kg of urea should be applied per mu to promote seedlings. After that, topdressing 1 time every 20-30 days, and applying ammonium sulfate 15-20kg or other nitrogen fertilizers per mu. After the plants are closed, water can be used for fertilization during irrigation. The third is the top soil. Andrographis paniculata is used as medicine with whole grass. When the seedling height is about 30 cm, the top is removed to promote the growth of lateral buds. At the same time, combined with intertillage, soil cultivation and weeding are carried out to promote the growth of adventitious roots and prevent lodging. If you want to keep the seeds, you don't need to top them when they are in full bloom, and you will remove the inflorescences that can't bear fruit. Fourth, do a good job in pest control. Spraying 1000 times of 50% thiophanate-methyl wettable powder can control seedling blight; 90% trichlorfon can be sprayed 1000 times for the control of mole cricket, moth larvae and black cutworm.

5. Harvest and processing. Andrographis paniculata can be harvested when it reaches the flowering and budding stage. It can be harvested at the 2-3 nodes of the stem base with a sickle and dried in the sun. Planting andrographis paniculata can be harvested twice a year,