旱地小麦根系生育与调控效应的研究

Root Growth and Regulation Effects of Winter Wheat in Dryland

用４年时间采用田间试验与盆栽试验相结合的方法对黄土区旱地小麦根系生育与栽培措施的调控效应进行了研究。结果表明：黄土区旱作小麦根系扎得较深，一般可达２ｍ以下，且４０ｃｍ以下土层根量分布相对较多；小麦次生根条数、根系生物量、根系活力等的变化均呈“Ｓ”形曲线，但增长速度最快和最大值出现的时间各有不同。播期、基本苗、氮、磷肥的用量和比例均可调控根系的数量和质量（活力）。

This paper studied the root growth and regulation effects of winter wheat in dryland areas with the method of a combination of field and pot experiments for 4 years. The result showed the roots of winter wheat could reach 2m below the soil surface and be largely distributed deeper than 40cm down the soil layer in loessial dryland areas. The number of secondary roots, root dry biomass, root vigor all changed in shaped curves, while the time for the fastest increase speed and the maximum value appearance were different. Also, sowing time, seedling density, the applied quantity and ratio of N and P fertilizers could regulate the number and quality (vigor) of the root systems.