夏玉米“5335”密植增粮增效关键技术
The Key Technology of “5335” for Dense Planting of Summer Maize to Increase Grain Yield and Efficiency

夏玉米“5335”技术的核心是精量单粒播种，密度每亩5000株以上，集成抗病耐密优良中早熟品种、深松30cm、缓控释肥三层分施、机械化实现深松、施肥、播种、旋耕、镇压5道工序一体化完成。具有省时省工、节本增效等特点。2019年以来，陕西省大力开展玉米“增密度、提单产”行动，项目组在阎良、临潼、高陵、鄠邑等区县积极开展“5335”技术模式试验示范，采取“边试验、边研究、边集成示范、边推广”的方式，不断熟化技术路径、扩大示范范围，总结出“优选耐密优良抗病新品种、运用‘5335’播种机械、科学水肥调控、化控、‘一喷多促’、病虫害绿色防控”等核心技术，为集成推广新技术提供了技术贮备，增粮增效效果显著。
The core of the “5335” technology for summer maize is precision single-seed sowing with a density of more than 5000 plants per 667 square meters. It integrates excellent mid-early maturing varieties with disease resistance and high-density tolerance, subsoiling to a depth of 30 cm, three-layer application of slow-release and controlled-release fertilizers, and realizes the integrated completion of five processes including subsoiling, fertilization, sowing, rotary tillage and compacting the soil through mechanization. It has the characteristics of saving time and labor as well as reducing costs and increasing efficiency. Since 2019, Shaanxi Province has vigorously carried out the campaign of “increasing density and raising unit yield” for maize. The project team has actively carried out experimental demonstrations of the “5335” technological model in districts and counties such as Yanliang, Lintong, Gaoling, and Huyi. By adopting the approach of “conducting experiments, conducting research, integrating demonstrations and promoting at the same time”, it has continuously refined the technological path, continuously expanded the demonstration scope, and summarized core technologies such as “selecting excellent new varieties with high-density tolerance and disease resistance, using the ‘5335’ sowing machinery, scientifically regulating water and fertilizers, using chemical control measures, implementing ‘one spraying for multiple promotions’, and carrying out green prevention and control of diseases and pests”. This has provided a technological reserve for the integrated promotion of new technologies and has achieved remarkable effects in increasing grain yield and efficiency.