| Field experiments were carried out to investigate the influence of ridge tillage with different structures and flat tillage on the growing indexes of rape, such as plant height, leaf area index (LAI), aboveground biomass, and yield. By using plant growth analysis, the growing rate of plant height, and the absolute growth rate (AGR) and relative growth rate (RGR) of aboveground biomass under different tillage measures were compared. The results indicated that during the earlier period of growing season, the plant height of rape under flat tillage was larger than that under ridge tillage, while during the flowering and green ripening stage, the plant height under ridge tillage increased faster, and LAI, AGR and RGR were much larger than that under flat tillage. Due to lower plant density under ridge tillage, the aboveground biomass, and the real and theoretical yield under ridge tillage were smaller than that under flat tillage in the end of growing season except for T4. And the treatment T4 (ridge height: 25 cm, the ratio of ridge height to spacing between adjacent ridges: 1/24) was superior in promoting growing and increasing yield to other ridge tillage structures and flat tillage. So it is a suitable cultivation measure for rape production in rainfed cropland. |