Andrographis cultivation techniques
First, nursery (a) election site preparation. Choose sunny, fertile, flat, easy irrigation and loose loam. Turn 2-3 times for sorghum, hoe width 1.1-1.2 meters, drain 20 cm deep, full fine manure, 200 kg per 30 square meters seedbed, 1 kg of phosphate fertilizer, seedbed soil and base fertilizer fully mixed, fine Fuping stepping on solid, seedbed disinfection and killing the underground pests, with phoxim, the enemy Kesong according to every 100 pounds of water against 100 grams of drug seedbed. (b) sowing. In early April, sowing in sunny days is appropriate, sowing treatment: In order to increase the seed germination rate, soaking in warm water of 40-45°C for 1-2 days before sowing, and use the fine sand dressing to scrape the seed coat. Mix the treated seeds with grass ash or fine soil and spread evenly on the seedbed (two kinds of 7 square meters sowing 1). Cover a layer of fine soil to cover the seeds just now, but there is still a small amount of seeds exposed, then use The sprayer wets the cover soil and covers the plastic film to increase the soil temperature. The film is covered with a layer of straw. (three) seedbed management. Before the emergence of the seedbed to keep moist, do not make the top soil dry and white, generally at 9 and 10 o'clock in the morning to open the film with a watering can watering, when the weather is dry at 3, 4 o'clock and then spray once again, the relative humidity remains at 70-80%. After the seedlings are flush, the number of watering can be reduced, and the dampness can be properly controlled to prevent the occurrence of damping-off. The seedbed temperature should be 25-30°C during the day, and the minimum temperature at night should be maintained at 20°C or higher. Generally, the straw is covered in the evening. Insulation, when the sun shines on the next day, the sun is opened. When the temperature is too high at noon, both sides of the plastic film are to be opened for ventilation. The first step is to open a small joint, and then gradually increase the temperature of the seedbed at about 20°C in late May and early June. Open the cover to consolidate the seedlings, properly control the water, promote the development of the root system and seedling growth, in order to adapt to the environmental conditions after transplanting. Second, transplanting. When the seedling height is 2 inches, there are 3 to 4 true leaf transplants. The day before transplanting, the soil is irrigated to facilitate soiling and the survival rate is high. The spacing is 0.8-1 feet and the acres are planted with 5000-8000 strains. Andrographia paniculata requires less soil, and the general land can be planted, but flat land, sunny leeward, loose soil, good drainage and irrigation conditions are good, can be net, orchard intercropping, a variety of crop interplanting (to avoid Solanaceae crop for the former茬 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬. Third, field management. Nitrogen fertilization is the main method of fertilization. After the seedling stage (normally 10 days), fertilize once every half month, when the seedling height is 15 centimeters, it can pick up the heart, promote the sprouting of lateral buds, increase the yield, and the high temperature season of June, July and August coincides with the vigorous growth period of Andrographis paniculata. At this time, timely weeding, loose soil, fertilization, irrigation, and 30 to 40 cm high when the andrographis can plant soil to prevent wind damage. Fourth, harvest. Andrographis paniculata was cut off before flowering buds (tips began to sharpen), and was transported to the hospital in time to turn over the sun until the stems became brittle. V. Major pests and diseases (1) Major diseases. Blight, commonly known as "rotten gills," occurs when seedlings 1-2 on true leaves. Fusarium wilt, seedling stage prone to occur. Black stem disease and epidemic disease are prone to occur in July-August high temperature and rainy season. Control methods: Ventilation, humidity control, application of phosphorus and potassium fertilizers, 1:1:120 Bordeaux spray at the beginning of the disease. (b) Insect pests. There are mainly crickets and small tigers. Control methods: 90% trichlorfon 1000 times or 75% phoxim 700 times watering.
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