1990～1993年,烟台市农科所科技人员潜心进行大姜高产栽培技术研究,获得重大突破。研究出大姜定向高密度平垄双行不培土栽培新方法,在牟平、海阳及平度等县市大面积示范开发,亩产由传统栽培的2500公斤左右,提高到4000～5000公斤,增产60～100%。这种新方法主要是五改。 From 1990 to 1993, Yantai Agricultural Science and Technology staff devoted themselves to ginger high-yielding cultivation techniques, access to major breakthroughs. Developed a new method of planting high-density ginger with two rows of flat-ridged soil and did a great job of demonstrating and developing large-scale plots in Muping, Haiyang and Pingdu counties. The yield per mu was increased from about 2,500 kg of traditional cultivation to 4,000 to 5,000 kg, Yield 60 ~ 100%. This new method is mainly five changes.