| In order to set up the monitoring and evaluation index for potato drought disaster in Inner Mongolia,established the regression equation between the negative precipitation anomaly percentage with the relative meteorological yield in whole growing period, seedling stage and flowering stage in the middle western and eastern regions, combined with the agricultural drought grade and the national standard as precipitation anomaly percentage and the meteorological drought grade, obtained the grade indexes as light drought, medium drought and heavy drought in three stages, such as in whole growing period, grade index of precipitation anomaly in middle western and eastern regions were -5%~-25%, -25%~-40%, <-40% and -10%~-30%, -30%~-45%, <-45% respectively; in the seedling stage, the grade index were -10%~-35%, -35%~-50%, <-50% and -20%~-45%,-45%~-60%, <-60% respectively; in the flowering stage, the drought index were same both western and eastern regions, the grade index was -5%~-30%、-30%~-50%、<-50% respectively. The drought indexes were tested and verified by using the occured heavy drought disaster in main planting areas of potato in 2014 and 2015, and the calculated results were in good agreement with the actual occurrence. |