NDLI: Nitrogen Transfer Between Plants: A $^{15}$N Natural Abundance Study with Crop and Weed Species

Content Provider	SpringerLink
Author	Moyer Henry, K. A. Burton, J. W. Israel, D. W. Rufty, T. W.
Copyright Year	2006
Abstract	An increasing amount of evidence indicates that N can be transferred between plants. Nonetheless, a number of fundamental questions remain. A series of experiments was initiated in the field to examine N transfer between N$_{2}$-fixing soybean (Glycine max [L.] Merr.) varieties and a non-nodulating soybean, and between N$_{2}$-fixing peanut (Arachis hypogaea L.) or soybean and neighboring weed species. The experiments were conducted in soils with low N fertilities and used differences in N accumulation and/or $^{15}$N natural abundance to estimate N transfer. Mixtures of N$_{2}$-fixing and non-nod soybean indicated that substantial inter-plant N transfer occurred. Amounts were variable, ranging from negligible levels to 48% of the N found in the non-nod at maturity. Transfer did not appear to strongly penalize the N$_{2}$-fixing donor plants. But, in cases where high amounts of N were transferred, N content of donors was noticeably lowered. Differences were evident in the amount of N transferred from different N$_{2}$-fixing donor genotypes. Results of experiments with N$_{2}$-fixing crops and the weed species prickly sida (Sida spinosa L.) and sicklepod (Senna obtusifolia [L.] Irwin & Barneby) also indicated substantial N transfer occurred over a 60-day period, with amounts accounting for 30–80% of the N present in the weeds. Transfer of N, however, was generally very low in weed species that are known to be non-hosts for arbuscular mycorrhizae (yellow nutsedge, Cyperus esculentus L. and Palmer amaranth, Amaranthus palmeri [S.] Watson). The results are consistent with the view that N transfer occurs primarily through mycorrhizal hyphal networks, and they reveal that N transfer may be a contributing factor to weed problems in N$_{2}$-fixing crops in low N fertility conditions.
Starting Page	7
Ending Page	20
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	282
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	arbuscular mycorrhizae N$_{2}$ fixation $^{15}$N natural abundance N transfer Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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