| By using Plateau 602,Dingxi35,Huining15,Longchun12 and Longchun20 as material,the experiment was carried out to study the relationship between plant type indices and yield formation in spring wheat on dryland.The results showed that the plant type indices of high-yield spring wheat were as follows: the plant height was 85100 cm;the ratio of top internode to stem length was larger than 40%; the splaying angle and cambering degree of upper three leaves were little;the ratio of length to width of flag leaves was 12∶1;and the leaf area index at anthesis stage was about 3.5. |