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大田实验采用生态学中的de Wit替代系列法,研究不同水肥条件下地方春小麦品种和尚头和新育成的春小麦品种定西-24混播时的相对竞争能力与其单播经济产量之间的相关性,以及混播条件下二者的竞争结果.结果表明:在雨养、中水中肥、高水高肥处理中,和尚头和定西-24的相对竞争能力与其单播经济产量之间的关系分别为负相关、负相关和无特定相关.雨养条件下,和尚头可以从较深土层吸收较多的储藏水分,中水中肥与高水高肥条件下,定西-24吸收水分的能力强于和尚头的.和尚头和定西-24的根量变化趋势一致:随着土壤深度的增加而减小.混播时,雨养条件下和尚头的相对竞争能力强于定西-24的,中水中肥条件下,和尚头的相对竞争能力弱于定西-24的,表明和尚头对定西-24的相对竞争能力发生了逆转.剔除由竞争能力导致的根系冗余,有望成为半干旱地区小麦育种的一个目标.
Field experiments using ecological de Wit alternative series method to study the relationship between the relative competitiveness of local spring wheat cultivars and fresh spring wheat varieties Dingxi -24 mixed broadcast and their unicast economic output under different water and fertilizer conditions, The results showed that the relationship between the relative competitiveness of He Shangtou and Dingxi-24 and their unicast economic output were negatively correlated in rain-fed, medium-water-medium and high-water-high-fertilizer treatments respectively, Correlation and no specific correlation.Under rainfed conditions, the monk head can absorb more storage water from deeper soil layers, and under medium and high water and high fertilizer conditions, Dingxi-24 has stronger ability to absorb moisture than the monk head The root volume of Dingxi-24 changed in the same direction: it decreased with the increase of soil depth.The relative competitive ability of monk head under rainfed condition was stronger than that of Dingxi-24 under mixed condition, and the relative competitive ability of monk head Weaker than Dingxi -24, indicating that the monk’s head has reversed the relative competitiveness of Dingxi-24. Excluding the competition caused by the root redundancy, is expected to become semi-arid wheat breeding Targets.