NDLI: Nitrogen fertilization and critical nitrogen concentration for contemporary high yielding cotton under no-tillage

Content Provider	Springer Nature Link
Author	Yin, Xinhua Main, Christopher
Copyright Year	2015
Abstract	Nitrogen (N) management strategies for cotton may need to be modified because of the use of new high yielding cultivars and improved cropping systems. The objective of this research was to determine the optimal N application rate and critical leaf N concentration for contemporary high yielding cotton under no-tillage systems. A strip-plot trial was conducted on eleven private farms in Crockett, Fayette, Gibson, Haywood, Lake, and Lauderdale counties from 2009 through 2010 in Tennessee. Five N treatments of 0, 45, 90, 134, and 179 kg N ha−1 were evaluated as side-dress N of urea and ammonium nitrate solution in strip plots in a randomized complete block design with three replicates. Eight out of the eleven location–years showed significant yield responses to side-dress N applications. Applying 45–146 kg N ha−1 (including pre-plant and side-dress N) was sufficient for maximum cotton yields at the N responsive location–years. The results of this study indicate that the current N fertilizer recommendations for cotton may be more than adequate for some upland soils but inadequate for some other upland fields. A range of 34.4–47.4 g kg−1 of leaf N concentration at early bloom is required for cotton to reach to maximum lint yield. These critical leaf N values were somewhat greater than the current sufficient N range, which suggests that the current critical leaf N concentrations for cotton in the southern U.S. may need to be modified; contemporary high yielding varieties require slightly higher N application rates to maximize yields.
Starting Page	359
Ending Page	373
Page Count	15
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	103
Issue Number	3
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-11-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Side-dress N Critical leaf N Extractable soil N No-tillage Yield Cotton Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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