|Reddy, Kambham - MISSISSIPPI STATE|
|Koti, Sailaja - MISSISSIPPI STATE|
Submitted to: Agronomy Journal
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 1, 2004
Publication Date: July 1, 2004
Citation: Reddy, K.R., Koti, S., Davidonis, G.H., Reddy, V. 2004. Interactive effects of carbon dioxide enrichment and nitrogen nutrition on cotton growth, development, yield and fiber quality. Agronomy Journal. 96:1148-1157. Interpretive Summary: The possible consequences of future elevated levels of atmospheric CO2 concentration and nitrogen nutrition on cotton yield and fiber quality were determined to develop suitable nutrient management options for future climates. The objectives were to evaluate a) effect of subambient, ambient and elevated carbon dioxide on leaf nitrogen concentration and yield attributes of cotton grown under nitrogen sufficient and deficient conditions, b) interactive effects of carbon dioxide on cotton lint yield and fiber quality under optimum water and temperature conditions and c) provide functional algorithms for fiber quality as affected by carbon and nitrogen to develop fiber quality models. Leaf nitrogen concentration decreased as carbon dioxide concentration increased, significant carbon dioxide and nitrogen interactions for total bolls produced and retained were observed and the response was highest at elevated carbon dioxide and nitrogen sufficient conditions. It was inferred from the results that while increasing the yield future elevated carbon dioxide levels will not have deleterious effects on fiber quality if nitrogen nutrition is optimum.
Technical Abstract: The possible consequences of future elevated levels of atmospheric carbon dioxide and nitrogen nutrition on cotton yield and fiber quality were determined to develop suitable nutrient management options for future climates. Cotton cultivar NuCOTN 33B was grown in sunlit controlled enviroment chambers at subambient, ambient and elevated carbon dioxide at two levels of Nitrogen fertility treatments (Nitrogen-sufficient and Nitrogen-deficient). Leaf-N concentration decreased with increasing supply of carbon dioxide even when Nitrogen is freely available to the plant. These low leaf Nitrogen concentrations did not alleviate the effects of elevated levels of carbon dioxide in producing higher lint and yields under both Nitrogen-sufficient and deficient conditions. Significant carbon dioxide and Nitrogen interactions for total boll produced and retained were observed and the response was highest at elevated carbon dioxide and Nitrogen-sufficient conditions. In contrast, fiber quality was not significantly affected by carbon dioxide, but the leaf Nitrogen concentrations, which varied with carbon dioxide, had either a positive/negative influence on the fiber quality parameters. Functions were developed between leaf Nitrogen during boll maturation period (BMP) and fiber parameters, which can be used to develop fiber models. Leaf N-BMP had significant positive relations with fiber fraction. Leaf N-BMP had negative relations with mean fiber diameter and short fiber circularity; micronafis. It is inferred from the results that while increasing the yield, future elevated carbon dioxide will not have any deleterious effects on fiber quality if Nitrogen nutrient is optium.