Research Article of American Journal of Agricultural Research
Nitrogen Nutrition, Yield, and Quality of Cotton under Varying Nitrogen Application Timings and Planting Dates
Xinhua Yin1* and Guisu Zhou2
1Associate Professor, Ph.D. Department of Plant Sciences The University of Tennessee 605 Airways Blvd. Jackson, TN 38301, USA; 2Associate Professor, Ph.D. College of Tobacco Science Yunnan Agricultural University Kunming, Yunnan 650201, China
Nitrogen (N) management may need to be different for cotton planted at different dates. The objective of this research was to determine the optimal N application timing for cotton under different planting dates. A field trial was conducted on the University of Tennessee West Tennessee Research and Education Center at Jackson, TN in 2011 and 2012 in a split plot randomized complete block design with four replicates. Three cotton planting dates of early planting, standard planting, and late planting and four N application timings of pre-plant, at-planting, early side-dress, and late side-dress were assigned to the whole plots and subplots, respectively. Although the interactions of planting date by N application timing, year by N application timing, and year by planting date were significant on leaf N at early bloom and late bloom; cotton plants received adequate N nutrition for optimal yield under different N application timings and varying planting dates in both years. No significant difference in lint yield was observed among the four N application timings regardless of planting date in 2011 that was wet in the early season but dry in the late season. In 2012 that was dry in the early season but wet in the late season, however, lint yield was higher with late side-dress of N than pre-plant at standard planting; the yield did not differ among the four N application timings at early planting or late planting. Higher fiber micronaire but lower fiber strength was obtained under early planting and standard planting than late planting. In 2011, the length and uniformity of fiber were not affected by the planting date. In 2012, however, the length and uniformity of fiber were greater at late planting than early planting and standard planting. The fiber length and fiber uniformity were greater with late side-dress of N than pre-plant and early side-dress of N. Overall, the effects of N application timing on cotton yield vary with planting date and year, which suggests that planting date and weather conditions need to be taken into account in deciding the N application timing.
Keywords: Nitrogen Application Timing, Planting Date, Leaf Nitrogen, Yield, Quality, Cotton
How to cite this article:
Xinhua Yin and Guisu Zhou. Nitrogen Nutrition, Yield, and Quality of Cotton under Varying Nitrogen Application Timings and Planting Dates. American Journal of Agricultural Research, 2019,4:72. DOI: 10.28933/ajar-2019-09-2406
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