Search National Agricultural Library Digital Collections

NALDC Record Details:

Fertilizer Nitrogen Timing and Uptake Efficiency of Hybrid Hazelnuts in the Upper Midwest, USA

Permanent URL:
http://handle.nal.usda.gov/10113/37193
File:
Download [PDF File]
Abstract:
Hybrids of Corylus avellana, C. americana and C. cornuta, are being developed as a potential crop for the Upper Midwest of the United States, but little is known about fertilizer nitrogen (N) management. We hypothesized that N application when the bushes were most fully leafed out would result in highest N uptake efficiency (NUE). We used 15N-labeled ammonium nitrate to measure NUE from soil applications in mid-April, late April, late May, early August, and mid-September. Nitrogen applied in either mid- or late April never comprised more than 5% of the total N in shoots or leaves, suggesting that N used for early leaf expansion came primarily from stored reserves. Applications made after April demonstrated that N was quickly translocated to rapidly growing plant parts: May applications comprised 9% of the N in leaves collected in July; August applications comprised 12% of the N in nut kernels collected in September; and September applications comprised 9% of N in catkins collected in October. Nitrogen applied in August and September appeared in new shoots the following April at higher levels than it did aboveground the previous October, showing that N applied late in the season may be stored belowground over the winter. NUE was highest for August and September applications at one site and August and mid-April applications at the other, implying that summer is generally the best time to apply N for most efficient uptake. However, overall NUE was low, only 5% for August applications, suggesting a need to develop other methods of improving NUE in hybrid hazelnuts.
Author(s):
Braun, Lois C. , Gillman, Jeffrey H. , Russelle, Michael P.
Subject(s):
Corylus avellana , Corylus americana , Corylus cornuta , hazelnuts , crop production , nitrogen fertilizers , ammonium nitrate , fertilizer rates , application timing , nutrient uptake , nitrogen content , nutrient use efficiency , plant nutrition , seasonal variation , hybrids , genetic variation , plant breeding , Minnesota
Format:
p. 1688-1693.
Note:
Includes references
Source:
HortScience : a publication of the American Society for Horticultural Science 2009 Oct., v. 44, no. 6
Language:
English
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.