T/TJFS 01-2025 Understory Salt-alkali Soil Summer Soybean Planting Technical Specification

Scope

Main technical content: Select soybean varieties with excellent salt and alkali resistance, shade tolerance, upright growth, and strong resistance to lodging based on local soil site conditions. Choose summer-sowing soybean varieties that have passed national or provincial approval and are suitable for planting in saline-alkaline soils, such as Qihuang 34 and others. Use seed treatment with pesticides or seed coating agents to prevent pests and diseases. The treatment should meet the requirements of NY/T 393 and GB/T 15671. The sowing density of summer-sowing soybeans is 12,000~15,000 plants/667m2 (measured in the soybean planting zone). Adjust the density according to the variety's plant type characteristics and soil fertility. For varieties tolerant of high planting density or late sowing, or in areas with high soil salinity, increase the sowing density appropriately. The sowing depth should be 3~5cm. For soils with high clay content, shallow sowing (2~3cm) is recommended. Apply base fertilizer based on soil fertility, measured in the soybean planting zone. Generally, apply 1,000~2,000kg/667m2 of organic fertilizer, 50kg/667m2 of superphosphate, and 10kg/667m2 of potassium sulfate as base fertilizer before sowing. Alternatively, apply 25kg/667m2 of diammonium phosphate as base fertilizer, followed by 10kg/667m2 of potassium sulfate, all applied in one go during land preparation. The selection of fertilizers should comply with the provisions of NY/T 394. Control pests and diseases promptly and specifically based on their occurrence. Use pesticides with low sensitivity to trees. Select pesticides scientifically, paying attention to reasonable rotation and alternation of pesticides. Avoid spraying pesticides directly on trees during application. The application of chemical pesticides should comply with the relevant requirements of GB/T 8321. The optimal time for manual harvesting is the late yellow ripening stage of soybeans, when 90% of the leaves have fallen, the

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