The relationship of competitive ability and productive performance between land race Monkhead and modern variety 8275 of spring wheat in semi arid area of Loess Plateau was invested using de Wit replacement series.

• 采用deWit替代系列法研究了黄土高原半干旱雨养农业区传统地方品种（和尚头）与现代品种（陇春8275）之间在混播条件下的竞争结局。