In the process of adjusting the agricultural industry structure, farmers across different regions have actively expanded their crop varieties to boost their income. One such crop is the double-season white, which is harvested twice a year—once in October and November, and again in May and June. The yield per mu (approximately 667 square meters) can reach around 3,000 kg, with income per mu ranging from 4,000 to 6,000 yuan, and in some cases even exceeding 10,000 yuan.
When it comes to variety selection, several high-quality hybrids have been developed over the years. For instance, the Zhejing No. 2 and Zhejing No. 991 varieties, both bred by the Department of Horticulture in Zhejiang, have received recognition for their performance. These varieties were awarded the Ministry of Agriculture Science and Technology Progress Award in 1993 and 1997 respectively. In addition, local varieties like Radix Astragali, Radix Paeoniae Rubra, Antler Acarus, and Four Seasons Aphid are also recommended due to their strong disease resistance, high yields, and superior quality.
The planting season is divided into two periods: spring planting in early April and summer planting between June and July. Soil preparation is crucial, as the white plants grow tall and vigorously, requiring deep plowing—about 17–20 centimeters. For fertilization, farmers typically apply 1,000–1,500 kg of organic manure like pig or cow dung, or 100 kg of cake fertilizer, or 50–60 kg of compound fertilizer per mu.
For proper planting density, seedlings should be carefully dug and transplanted. Before planting, trim the leaf tips to keep the plant height at 25–30 cm, and choose cloudy days or evenings for transplanting to improve survival rates. Water the field lightly before planting, and space the plants 60–70 cm apart, with one plant per hill for spring planting or two to three plants per hill for summer planting, resulting in about 1,200 hills per mu.
After planting, a "seedling fertilizer" should be applied 7–10 days later using 5–10 kg of urea or compound fertilizer to promote growth. A second top dressing is given during mid-tillering, with 20 kg of urea or 30 kg of compound fertilizer per mu to encourage tiller development. A third application, known as "pregnancy fertilizer," is applied after the plant enters the reproductive stage, using 20–30 kg of urea or compound fertilizer to support fruit development and increase yield.
Field cultivation involves 2–3 rounds of weeding, especially when the plants are growing. During this time, water the field first, combine it with topdressing, and ensure the soil remains well-fertilized. By mid-July and mid-August, yellow leaves are removed and incorporated back into the soil as natural fertilizer, improving soil aeration and light penetration.
Pest control is essential, with common issues including locusts, rust, and leaf spot disease. In mid-July and late September, locusts are controlled using 16–20 ml of ginsenoside suspension per 50 kg of water. Rust and leaf spot disease are managed by spraying 20% triadimefon powder (35–50 grams per 50 kg of water) once a month from June to July and September to October, which has proven effective in reducing damage.
Harvesting takes place from October to November, with an interval of 2–3 days for early harvests and 4–5 days for later ones, yielding 1,250–1,500 kg per mu. Summer bark harvesting occurs between May and June, with a 2–3 day interval and a yield of 1,500–1,750 kg per mu. This efficient farming method not only increases productivity but also ensures sustainable agricultural development.
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