1. Baker, W. H., McConnell, S. J., Sabbe, W. E., Maples, R. L. and Varvil, J. J. An evaluation of petiole sap and leaf chlorophyll methods for assessing the nitrogen and potassium status of cotton in the field. Proceedings of the 1992 Southern Soil Fertility Conference. pp.93–103. Ardmore, OK: The Noble Foundation.
2. University of Georgia Cooperative Series Bulletin 368;Baker W. H.,1992
3. Relationships between Leaf‐Blade Nitrogen and Relative Seedcotton Yields