玉米新杂交种的产量-密度方程与耐密性研究

以紧凑型玉米新杂交种为材料系统研究了产量与密度的关系，结果表明，单株生物产量、群体生物产量、单株籽粒产量和群体籽粒产量均随密度的升高呈规律性变化，群体生物产量和群体籽粒产量分别符合Ｗ＝ｘ／（ａ＋ｂｘ）和Ｗ＝ａｘｅｂｘ（ａ＞０，ｂ＜０）模式，登海１号和鲁单９６１的最高群体仔粒产量分别为９６４．７ｇ／ｍ２和８７３．６ｇ／ｍ２，其适宜的种植密度分别是８．１株／ｍ２和７．７株／ｍ２。而单株籽粒产量和穗粒数符合Ｗ＝ａｅｂｘ（ａ＞０，ｂ＜０）模式，千粒重和玉米穗长、穗粗均符合Ｙ＝ａ＋ｂｘ方程，回归截距ａ和回归系数ｂ反映了品种的生产潜力和耐密性；反映玉米结实性指标的空秆率和败育籽粒数与密度的关系可分别用回归方程Ｙ＝ａｅｂｘ和Ｙ＝ａ＋ｂｘ＋ｃｘ２表示

Study on Yield-Density Equation and High Density Tolerance of New Maize Hybrids

Study on the relation between yield and density of new compact maize hybrids showed that relationships between plant density and plant biological yield,and population grain yield could be expressed by equations W=x/(a+bx) and W=axe bx (a>0,b<0)respectively.The maximum population yield of Denghai1 and Ludan961 were 964 7g/m 2 and 873 6g/m 2,with the reasonable density 8 1 and 7 7 plants per square meter.The economic yield per plant and kernel numbers per ear were corresponded with W=ae bx (a>0,b<0),1000 kernels weight,ear length,ear diameter are all expressed by Y=a+bx,with a and b reflecting production potential and high density tolerance.The changes of plant barren ratio and aborted kernel numbers with density could be described by Y=ae bx and Y=a+bx+cx 2.