Estimation and imputation of crop yield advances by states and regions
Date
2017-06-23
Authors
Auer, Ludwig
Heady, Earl
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Extension and Experiment Station Publications
It can be very challenging to locate information about individual ISU Extension publications via the library website. Quick Search will list the name of the series, but it will not list individual publications within each series. The Parks Library Reference Collection has a List of Current Series, Serial Publications (Series Publications of Agricultural Experiment Station and Cooperative Extension Service), published as of March 2004. It lists each publication from 1888-2004 (by title and publication number - and in some cases it will show an author name).
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Extension and Experiment Station Publications
Abstract
The objectives of this study were: (a) to estimate the proportions of crop yield change attributable to crop variety improvement, higher rates of fertilization, regional specialization and other crop yield variables and (b) to determine how the relative economic yield level per acre changed over a 20-year period.
The analysis covers major crops on a state, regional and national basis. Based on time-series data, over 80 state crop-production functions were estimated for corn, wheat, oats, barley, grain sorghum, soybeans, flax, cotton and tame hay. Annual state crop yields were considered a function of inherent soil fertility, weather, crop variety improvement, fertilizer application, short-run changes in acreage, and time.