A research on assessing method of frost damage in winter wheat in Huanghuai Area

摘要

Based on the relationship between yield of winter wheat at different growth stages and meteorological factors, the actual yield can be segregated step by step. Based on the yield data of reviving period to heading date without meteorological disasters, the ideal yield were calculated with Lagrange's Interpolation Polynomial and the yield loss rate affected by meteorological disasters have been assessed. By analyzing the degree of different meteorological disasters and their effect on yield from turning green period to heading date, the model of evaluation on late frost loss was defined. Take Shangqiu station as representative in Huanghuai Area, the yield loss caused by frost from 1980 to 2006 were simulated and analyzed. The results shows that the average rate of yield loss was 11.7% and the heavy disaster years of yield loss can be above 30%.