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Published in Crop Sci 14:541-546 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Development of a Nitrogen Balance for Cotton Growth Models: A First Approximation1

J. W. Jones, J. D. Hesketh, E. J. Kamprath and H. D. Bowen2

Daily growth values of cotton (Gossypium hirsutum L.) were calculated based on the carbohydrate balance of SIMCOT II, a simulation model of cotton growth and development. The daily N requirements for new growth of leaves, stems, roots, burrs, and seed were calculated based on maximum and minimum N concentration for these plant parts. Daily N absorption depended on the availability of N in the soil pool and new growth requirements. If the absorbed N was less than the required amount, partitioning functions determined the distribution of available N into each sink. During periods of N shortages, some N reserves were supplied for new growth from the breakdown of N compounds in the older leaves and stems. Depending on the level of N shortage, new growth was slowed, bolls and squares were abscised, and some leaves were shed.

The model shows that, based on the N balance, growth can be restricted and reproductive organs aborted after SIMCOT II runs its normal course for a day during the boll setting period. Simulated fruiting characteristics and yield curves were similar to those of real plants.

Key Words: Modeling • Nutrition • Nitrogen stress • Partitioning function

1 Southern Region, ARS-USDA and North Carolina State University, Raleigh, NC 27607.

2 Agricultural Engineer, USDA; Soil Scientist, USDA; Professor of Soil Science and Professor of Biological and Agricultural Engineering, North Carolina State Univ., Raleigh, N.C.

Received for publication December 21, 1973.




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