Charles A. Shapiro

Date of this Version



© 1986, The Board of Regents of the University of Nebraska on behalf of the University of Nebraska–Lincoln Extension. All rights reserved.


This NebGuide discusses the methods used by the hail insurance industry to assess yield loss due to hail damage in grain sorghum. A hailstorm can cause yield losses in sorghum ranging from slight to total. Research has been conducted to accurately predict the effects of hail damage on sorghum yields. Results from these studies are used by hail insurance companies to assess yield losses and determine adjustments paid to clients. Information in this NebGuide will acquaint producers with procedures used to assess sorghum hail damage. These procedures may also be useful in estimating crop yields wherever stand loss or defoliation occurs. Yield loss predictions are based on two factors: a) stage of growth at the time of damage, and b) the degree of plant damage. Plant damage is classified as either direct damage or defoliation. Direct damage is divided into three categories: stand reduction, stalk damage and head damage. Defoliation is the loss of leaf area which may lead to later yield losses. Each step of the adjustment process will be discussed. A worksheet (Figure 4) is provided to illustrate these adjustment procedures.