However the larger part of the yield gap between the bio-physical production potential and actual production (81.4%) exists between the PS-2 and PS-X levels and is largely caused by management factors.

• PS-2与PS-X水平间的平均产量差异较大；占总产量差(PS-1与PS-X水平之差)的81.；4%25；主要由田间管理差异造成;