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The Sigma+ Cotton Model

Hal Lemmon, Ning Chuk, Vagimalla Reddy, Basil Acock, Yakov Pachepsky, Dennis Timlin


A computer program has been developed which simulates the growth of cotton, and based upon the results of the simulation, recommends to the grower when to irrigate, when and how much to fertilize, and when to harvest.

The model is written in the C++ programming language using the object oriented design and programming. The object oriented structure of the model is given in Table 1.

The model has been operational since January 1995. However an analysis of the results has shown that the model has failed to properly predict the plant's leaf water potential. Consequently when there was little or no water stress the model gave satisfactory results. However when a crop was grown under conditions where water stress occurred, the model did not adequately compensate for the condition. A new object for water stress was developed. The theory for the model was taken from Glycim, a crop model for Soybeans (Acock, et. Al.). Preliminary results indicate that this enhancement to the model allows it to properly predict water stress and to properly allow for water stress in the simulating the growth of the cotton plant. However not enough test cases have been run to definitely establish this.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 529 - 531
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998