Detailed Explanation of High-Yield Cultivation Techniques for Alisma orientale: Master the Key Points to Boost Income

Alisma orientale, also known as Swan Egg, Ruyi Vegetable, Water Marsh, Cheku Vegetable, Tiantu, etc. Its underground tuber is used medicinally and has the effects of clearing heat, draining dampness, and promoting urination. It mainly treats nephritis edema, pyelonephritis, enteritis diarrhea, urinary tract infection, phlegm-fluid retention, vertigo, and other conditions. It is mainly produced in Fujian, Sichuan, and other provinces.

Morphological Characteristics: It is a perennial marsh plant of the Alismataceae family. It has underground spherical tubers. All leaves are basal; petioles are 5-50 cm long, enlarged at the base into a sheath-like form; leaves are elliptical, long elliptical, or broadly ovate, 2.5-18 cm long and 1-9 cm wide, with apex acuminate, acute, or mucronate, and base cordate, subrounded, or cuneate. The flowering scape is erect; flowers are whorled in umbel-like arrangements, the peduncle of the umbel is 2-4 cm long, and they further form a large panicle; flowers are bisexual, with 3 outer perianth segments, sepal-like, broadly ovate, 2-3 mm long and 1.5 mm wide, and 3 inner perianth segments, petal-like, white, smaller than the outer whorl; stamens 6; carpels numerous, whorled, styles shorter than or equal to the ovary, curved. Achenes are flattened on both sides, with 1-2 shallow grooves on the back, 1.5-2 mm long and 1.5 mm wide, with persistent styles.

I. Growth Habits: Alisma orientale prefers a warm, humid environment with ample sunlight. It is cold-tolerant, but yield is low when planted in cold, cool areas with early frost periods. Seedlings prefer shade and fear strong light; established plants prefer sunlight. It is suitable for growing in shallow-water paddies. It has low soil requirements, but cultivation is best in clay loam rich in humus or in rice paddies. Sandy soil or cold-water paddies are not suitable for planting. Continuous cropping should be avoided.

II. Land Preparation and Fertilization: Select a paddy field suitable for Alisma orientale growth and, while preparing the land, apply sufficient base fertilizer: 3000 kg of farmyard manure, 20 kg of urea, and 50 kg of phosphate and potassium fertilizer per mu, then make raised beds 1.3 m wide and wait for sowing.

III. Sowing: Alisma orientale is propagated by seed. It is carried out in two steps: raising seedlings and transplanting. The sowing period is from mid-June to early July. Transplanting too early tends to cause bolting and flowering; too late results in a short growth period and low yield. Seedling Raising: Before sowing, soak Alisma orientale seeds in clean water for 24-48 hours, then promote germination. Sow once the seeds show white sprouts. When sowing, mix the seeds evenly with plant ash and scatter them uniformly over the prepared bed surface. Pat and press the bed surface with a broom so that the Alisma orientale seeds are in close contact with the soil layer; when the bed soil is slightly dry and cracked, irrigate with shallow water. Prevent the water from being too full, which would cause the seeds to drift. The sowing rate is 1 kg per mu. One mu of seedlings can transplant 30 mu. After Alisma orientale emerges, strengthen field management and cultivate for about 45 days before transplanting. Transplanting: Generally carried out between the Beginning of Autumn and the End of Heat. Set the cultivated Alisma orientale seedlings on the prepared bed surface at a row spacing of 30×25 cm. Water to preserve soil moisture and promote survival.

IV. Field Management: After Alisma orientale reaches full emergence or survives, pay attention to intertillage and weeding. Because Alisma orientale prefers shallow water, maintain a water depth of 3-5 cm on the bed surface. During the underground rhizome enlargement period, reduce the field water and maintain a water depth of about 1 cm. After mid-November, gradually drain the field water and prepare for harvest. When Alisma orientale bolts and flowers, remove the flowering scapes promptly to prevent nutrient consumption.

V. Pest and Disease Control: The main disease of Alisma orientale is white spot disease, which can be controlled with mancozeb in the early stage of onset. The main pest is the Alisma orientale rhopalosiphum aphid, which can be killed with omethoate. For underground pests, use phoxim mixed with poison bait for trapping and killing.

VI. Harvesting and Processing: Alisma orientale is generally harvested around the Beginning of Winter, after the aboveground stems and leaves wither. Remove the stems, leaves, and fibrous roots from the dug underground rhizomes, dry them in the sun or by artificial drying, then put them in a basket and shake off the remaining fibrous roots and coarse skin so that the surface is smooth. They can then be sold as medicinal material. The yield is 250 kg per mu.