**1. Scope** This regulation outlines the production conditions and cultivation requirements for Class A Green Food soybeans. It applies specifically to the production of Grade A Green Food soybeans in Jilin Province, China. The standard ensures that all practices align with environmental sustainability and food safety principles. **2. Normative References** The following documents contain provisions that are referenced in this standard and form part of it. For dated references, only the original version applies; subsequent amendments or revisions do not apply unless explicitly agreed upon. For undated references, the latest version is applicable. Relevant standards include: - NY/T 391: Environmental Conditions for Green Food Production Areas - NY/T 393: Guidelines for the Use of Green Food Pesticides - NY/T 394: Guidelines for the Use of Green Food Fertilizers **3. Definitions** This standard uses the following definitions: - **Green Food**: A category of food produced under sustainable agricultural practices, free from pollution, safe, nutritious, and labeled with a green food certification. - **Grade A Green Food**: Refers to soybeans produced in areas with high ecological quality, where limited use of synthetic substances is permitted. These products must meet strict production, processing, and packaging standards and be certified by an authorized agency. **4. Requirements** **4.1 Production Area Conditions** - **Natural Conditions**: The area must have a frost-free period of over 110 days, an effective accumulated temperature of more than 2200°C, and annual rainfall exceeding 450 mm. - **Soil Conditions**: Soil should be deep with a pH between 6.5 and 7.0. - **Environmental Monitoring**: The provincial green food management department oversees environmental monitoring to ensure compliance with the standards set by NY/T 391. **4.2 Seeds and Selection** - **Variety Selection**: Choose varieties with appropriate maturity periods, high yield, good quality, and strong resistance to local pests and diseases. Replace varieties every three years. - **Seed Quality**: Seeds must meet at least the second-grade standard before sowing. - **Crop Rotation**: Avoid planting soybeans after beets or sunflowers. Maintain a three-year rotation cycle. **4.3 Soil Preparation and Fertilization** - **Ploughing**: Autumn ploughing to a depth of 20–22 cm is recommended. In spring, when the soil thaws to 5 cm, level the field and compact it to reduce weeds. - **Fertilization Principles**: Organic fertilizers should dominate, with chemical fertilizers used only in combination. The ratio of organic to inorganic nitrogen must not exceed 1:1. Nitrate-based fertilizers are prohibited. - **Fertilizer Application**: Apply more than 30,000 cubic meters of organic fertilizer per hectare, along with 100–150 kg of diammonium phosphate and 50 kg of potassium sulfate or 7.5 kg of biological potash fertilizer. - **Fertilizer Methods**: Apply lower layer (basic) fertilizer 12–15 cm below the seed, and upper layer fertilizer 3–5 cm below the seed. - **Foliar Spraying**: If needed, spray 15 kg of urea, 1.5 kg of potassium dihydrogen phosphate, and 750 kg of water per hectare during the late growth stage. **4.4 Sowing** - **Sowing Time**: When the soil temperature at 5–10 cm depth stabilizes between 6–9°C, sow from April 20 to May 5 in Jilin. - **Sowing Method**: Use large ridges and double-row spacing of 10–12 cm. Combine seeding, ridging, and pressing in one operation. - **Sowing Depth**: Sow 4–5 cm deep in dry fields and 3–4 cm deep in moist soil. - **Plant Density**: Adjust based on soil fertility and variety type. Central plains: 180,000–200,000 plants/ha. Eastern mountainous areas: 230,000–250,000 plants/ha. Western arid areas: 200,000–220,000 plants/ha. - **Seeding Quality**: Ensure no mixing of seeds and fertilizers. Maintain uniform seed placement and compact the soil after sowing. **4.5 Field Management** - **Weeding**: Use plows to remove weeds before planting. Improve soil aeration and increase ground temperature. - **Seedling Thinning**: Plant seedlings manually before the first compound leaves appear. Ensure proper density. - **Hoeing**: Perform timely hoeing to prevent weed growth. Stop before the soybean canopy closes. - **Pest and Weed Control**: - **General Principle**: Combine agricultural, physical, ecological, and biological methods. Use low-toxicity bio-pesticides and limit chemical pesticide use to once per season. - **Aphids**: Use insecticides like dimethoate or anti-indolyl as per GB4285 and GB8321 guidelines. - **Borer**: Release Trichogramma wasps twice during egg stages. Spray 5% cis-pentarate EC during adult mating. - **Herbicide Use**: Apply herbicides such as clomazone, metolachlor, or quizalofop according to specified dosages and application methods. **5. Harvesting** - **Harvest Period**: Harvest when about 10% of the leaves have fallen, and the beans have fully matured. - **Harvesting Practices**: Conduct harvesting on sunny days. Ensure single harvesting, pulling, stacking, threshing, and storage to maintain quality. (Word count: 762)

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