Detailed Explanation of Key Techniques for High-Yield Cultivation of Andrographis paniculata

Andrographis paniculata, also known as Yijianxi, Lanhexian, Yuanzhuixuyaocao, etc. The whole plant is used for medicinal purposes, with effects of clearing heat and detoxifying, antibacterial and anti-inflammatory, and reducing swelling and relieving pain. It is mainly used to treat bacillary dysentery, urinary tract infections, acute tonsillitis, enteritis, pharyngitis, pneumonia, and influenza, etc. Externally it treats suppurative otitis media, wound infections, and boils and swellings, etc. It is mainly produced in Fujian, Guangdong, Guangxi, Anhui, and other provinces and regions.

Morphological Characteristics: Andrographis paniculata is an annual or perennial herb of the Acanthaceae family. The plant height is 30-90 cm. The stem is upright, square, green or slightly purplish-red, with branches alternately opposite, nodes slightly swollen, and the stem is extremely brittle. Simple leaves are opposite; the leaf blade is lanceolate, with entire margins. The false cymose raceme forms a panicle at the top or in the leaf axils; the pedicels are square, and the bracts are green; the corolla is white or pale red; it is two-lipped, with purplish-red spots inside; there are 2 stamens; 1 pistil, the ovary is spindle-shaped, superior, with numerous ovules. The capsule is spindle-shaped, green, lighter in color when mature, dehiscing along the back, with the pericarp curved, ejecting seeds. Seeds are numerous, kidney-shaped, about 1 mm in diameter, reddish-brown or light-colored. The flowering period is September to October, and the fruiting period is October to November.

I. Growth Habits

Andrographis paniculata prefers a warm, humid environment with ample sunlight. It is afraid of drought, cold, and waterlogging. It is not easy to grow in low-temperature, arid, or low-lying areas. It has no strict requirements for soil, but loam or sandy loam with deep, loose, fertile soil rich in organic matter is best.

II. Land Preparation and Fertilization

Choose a field with high terrain and good drainage, and carry out intensive cultivation. In combination with land preparation, apply sufficient base fertilizer: apply 3000 kg of farmyard manure, 25 kg of urea, and 50 kg of phosphorus-potassium fertilizer per mu. Then make beds and wait for sowing.

III. Sowing

Andrographis paniculata is propagated by seeds. In production, the method of raising seedlings and transplanting is used. The sowing period is spring sowing. Seedling raising: Because the seed coat of Andrographis paniculata is relatively thick and hard, the seeds must be treated before sowing. First, use fine sand to rub off the waxy layer on the seed coat. Then soak the seeds in warm water at about 45°C for 24 hours. Take them out, mix with fine sand, and evenly scatter them on the prepared bed surface, then cover with soil to cover the seeds. Water to preserve moisture and promote germination. The sowing rate is 6-7 kg per mu. One mu of seedlings can be transplanted to 25 mu of field. After the seedlings emerge uniformly, strengthen field management, and they can be transplanted after about 2 months of cultivation. If plastic film is used for seedling raising, it has a great effect on increasing yield. Transplanting: Choose cloudy and rainy weather, and plant the Andrographis paniculata seedlings on the prepared bed surface at a row spacing of 25×20 cm. Water to preserve moisture and promote survival.

IV. Field Management

After the Andrographis paniculata seedlings emerge uniformly or survive transplanting, attention should be paid to intertillage and weeding. Water frequently in dry weather and drain immediately in rainy weather. Before and after the Andrographis paniculata plants close the rows, apply topdressing once, with 10 kg of urea and 10 kg of monopotassium phosphate per mu.

V. Pest and Disease Control

The main diseases of Andrographis paniculata include damping-off, fusarium wilt, and phytophthora blight. Integrated control measures can be adopted: 1. Soil disinfection: during land preparation, apply 5 kg of 65% mancozeb powder per mu into the soil for disinfection. 2. Before disease onset, use 1:1:120 Bordeaux mixture for prevention. 3. In the early stage of disease, use 50% carbendazim 500-fold solution for spray control. The main pests include cotton bollworm, noctuid moths, etc., which can be controlled with fenvalerate pesticide. For underground pests, use phoxim mixed with poison bait to trap and kill them.

VI. Harvesting and Processing

Andrographis paniculata is generally harvested from the bud stage to the full flowering stage. At harvest, cut the entire Andrographis paniculata plant at the root, dry it in the sun, and it can be sold for medicinal use. The yield per mu is 300-400 kg.