Incorporation of a Subsurface Tile Drainage Component into a Soybean Growth Model

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Shen, Jinmei
Batchelor, William
Kanwar, Rameshwar
Jones, James
Ritchie, Joe
Mize, Carl
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Kanwar, Rameshwar
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Agricultural and Biosystems Engineering

Since 1905, the Department of Agricultural Engineering, now the Department of Agricultural and Biosystems Engineering (ABE), has been a leader in providing engineering solutions to agricultural problems in the United States and the world. The department’s original mission was to mechanize agriculture. That mission has evolved to encompass a global view of the entire food production system–the wise management of natural resources in the production, processing, storage, handling, and use of food fiber and other biological products.

In 1905 Agricultural Engineering was recognized as a subdivision of the Department of Agronomy, and in 1907 it was recognized as a unique department. It was renamed the Department of Agricultural and Biosystems Engineering in 1990. The department merged with the Department of Industrial Education and Technology in 2004.

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  • Department of Agricultural Engineering (1907–1990)

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Agricultural and Biosystems Engineering

A simple tile drainage model was incorporated into a recent version of the CROPGRO-soybean model. The model was calibrated and validated using four years of data from the Water Quality Research site, located at the Iowa State University Northeast-Research Center near Nashua, Iowa having two soil types (Readlyn and Kenyon). The data consisted of measurements of soil water contents at different depths and times, cumulative monthly tile flow, and final crop yield from 36 different 0.41 ha plots that were individually tile drained. The model was calibrated to give the best fit between the predicted and measured tile flow, soil water content, and crop yield from 1993 and 1994 for each soil type. It was validated by using data from 1995 and 1996 for each soil type. Predicted soil water contents, tile drainage and soybean yield matched measured values very well over all years for these two soil types. The results of this study show that the modified CROPGRO model does a very good job in simulating soybean yields and water dynamics for Readlyn and Kenyon soil in the experiment.


This article is from Transactions of the ASAE 41 (1998): 1305–1313, doi:10.13031/2013.17303. Posted with permissoin.

Thu Jan 01 00:00:00 UTC 1998