Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)


Hail injury to crops is rather frequent and widespread in Iowa. No figures are available on losses to specific crops, but annual estimated losses to all crops in Iowa from 1936 to 1948 have been large, particularly in 1943, 1944 and 1947. These losses, shown in table 1, were compiled from township assessors' reports.

In 1947, the losses in five counties were more than 1 million dollars. Simulated hail damage experiments are conducted primarily to provide information which will enable farmers and hail insurance companies to ascertain, at time of loss, the Ultimate damage to a growing crop. Past investigations for the most part have attempted to imitate actual hall injury. Considerable difficulty has been encountered In attempting to translate the resulting data into information useful in determining the extent of injury due to actual hail.

It has become apparent from past investigations that the component factors which contribute to the ultimate damage must be considered relative to their separate or individual effects. The objective of this study was to make a critical evaluation of some of these component factors, as measured by their separate and additive effects on yield of seed and other agronomic characters of soybeans and corn. No attempt was made to make the general appearance of the treated plants similar to that of plants actually injured by hail. The experiments were designed to yield information having direct application to hail adjustment problems in the field.

The first part of this study was concerned with soybeans and the second part with corn. The data presented will be included under these two major subdivisions.



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