Chinese milkvetch

Chinese milkvetch is a heat-loving leguminous plant that typically grows as an annual or biennial. Sowing should commence in the spring when soil temperatures reach 10–12 degrees Celsius.

The seeding rate varies based on cultivation goals, generally ranging from 15 to 25 kilograms per hectare. Row planting with spacing of 15–20 cm is a common practice.

Seed scarification is a crucial pre-sowing step to soften the hard seed coat, which significantly improves field germination rates and ensures uniform stand establishment.

In temperate regions, planting in late April or early May allows the crop to utilize spring moisture effectively before the onset of rapid vegetative growth.

Seeds should be planted at a shallow depth of 2–3 centimeters. Sowing too deep can hinder seedling emergence and decrease overall crop density in the field.

As a member of the Fabaceae family, Astragalus sinicus forms symbiotic relationships with nitrogen-fixing bacteria, making it an excellent crop for soil nitrogen enrichment.

The crop thrives in moist, fertile soils, including low-lying areas and former paddy fields where other legumes might struggle due to high moisture levels.

It prefers a moderate climate with adequate rainfall. While it has good environmental plasticity, it is sensitive to extreme frost and prefers mild spring conditions.

Soil requirements include a neutral to slightly acidic pH. Lime application may be necessary on highly acidic soils to ensure optimal growth and development.

Phosphorus and potassium fertilization can greatly enhance the performance of milkvetch as a green manure, boosting both biomass production and root health.

The primary agricultural value of Chinese milkvetch lies in its high biomass yield, which makes it an ideal choice for green manure and soil conditioning.

Green mass production can reach 200–300 centners per hectare, providing a substantial amount of organic matter to be incorporated into the soil structure.

By fixing atmospheric nitrogen, this crop significantly reduces the need for synthetic nitrogen fertilizers in subsequent cultivation seasons for cash crops.

When grown for seed production, yields typically range from 5 to 10 centners per hectare, depending on local climate conditions and pollination efficiency.

Maximum biomass accumulation occurs during the budding and early flowering stages, representing the most effective time for soil incorporation.

Chinese milkvetch is generally resilient, but excessive soil moisture and poor drainage can lead to root rot diseases during prolonged rainy periods.

Nodule weevils are a common pest that can damage the root system, thereby inhibiting the plant's natural nitrogen-fixing capacity and overall vigor.

Aphid infestations during the flowering stage may damage buds and flowers, negatively affecting seed development and the success of the harvest.

Effective management includes crop rotation and the control of host weeds that may serve as reservoirs for diseases and pests throughout the season.

Biological pest control methods are recommended to maintain the ecological integrity of the soil, especially since the crop is used for sustainable soil improvement.

For green manure purposes, the crop should be mowed at the early flowering stage when the nutrient content is at its peak and the plant is most succulent.

Mowed biomass should be shredded and evenly spread across the field, followed by shallow tilling to incorporate the plant matter into the upper soil layer.

Seed harvesting should be timed carefully when the lower pods turn dark, preventing the pods from shattering and losing seeds on the ground before collection.

After harvest, seeds must be cleaned and dried to a moisture content of less than 12% to prevent mold growth and ensure long-term viability in storage.

Proper harvest logistics ensure that growers secure high-quality planting material for the next season while effectively managing crop residues.