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通过1995～2001年对“双千五田”立体栽培中玉米种植密度的调查,一套两作型的紧凑叶型品种60000～80000株/hm2的比40000～60000株/hm2的增产5.3%,四套五作型的紧凑叶型品种95000～115000株/hm2的比65000～90000株/hm2的增产24.1%。7年的调查研究表明,“双千五田”立体栽培中紧凑叶型品种比平展叶型品种增产14.8%。按纯面积计算,紧凑叶型品种合理的种植密度为,一套两作型的中秆品种75000株/hm2左右,高秆品种68000株/hm2左右;四套五作型的中秆品种111000株/hm2左右,高秆品种100000株/hm2左右。
Through the investigation of corn planting density in “Shuangqiantian” three-dimensional cultivation from 1995 to 2001, the yield of a set of two-type compact leaf-type cultivars of 60000 ~ 80000 plants / hm2 increased by 5.3% than that of 40000 ~ 60000 plants / Four sets of compact leaves of five types of compact 95000 ~ 115000 / hm2 than 65000 ~ 90000 / hm2 24.1% increase. Seven years of research have shown that the “Shuangqiantian” three-dimensional cultivation of compact leaf-type varieties than the flat-leafed varieties increased 14.8%. According to the pure area calculation, the compact planting density of the compact leaf type is a set of two types of mid-stem varieties about 75000 plants / hm2, about 68000 high-stalk varieties / hm2; four sets of middle-stalk varieties 111000 / hm2 or so, about 100000 high-stalk varieties / hm2.