How Do Precipitation and Irrigated Ratio Interactively Impact Corn Yield?
Bergstrom, John C.
Mullen, Jeffrey D.
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In this research, an econometric model has been constructed and estimated to study the relationship between precipitation, irrigated ratio and crop yield. The model was based on the weather and yield data in the southwest part of the State of Georgia. The econometric model includes three sets of explanatory variables: principal components of temperature and precipitation, precipitation distribution index (PDI) and de-trended irrigated ratio. The estimated results showed that de-trended irrigated ratio is significant in almost all of the models. PDI also helps improve the goodness-of-fit of the model. However, PDI is not highly correlated to de-trended irrigated ratio as expected. An explanation for this could be that Georgia irrigated ratio is still low and farmers’ response to weather change is slow.