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Development of a Nitrogen Balance for Cotton Growth Models: A First Approximation 1
Author(s) -
Jones J. W.,
Hesketh J. D.,
Kamprath E. J.,
Bowen H. D.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400040014x
Subject(s) - economic shortage , biology , nitrogen , gossypium hirsutum , sink (geography) , nitrogen balance , horticulture , botany , agronomy , chemistry , linguistics , philosophy , cartography , organic chemistry , government (linguistics) , geography
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.