The marginal effect of wheat was significant. The grain yield advantage of side row and second row of wheat in medium-strip pattern 30-30 were 39.0% and 15.4% respectively.
3.小麦的边际效应明显。
Marginal Effect is the basic causation of affect precision that HHT measure frequency. Apply symmetry extend can reduce error which be aroused by cubic spine interpolation.
端点效应是影响HHT方法频率测量精度的主要原因,利用对称延拓的方法有效的抑制三次样条插值端点效应引起的测量误差。