Record ID No. |
1960 |
Author(s) |
Mogren L.M., Caspersen S., Olsson M.E., Gertsson U , 2008 |
Affiliation |
Swedish Univ Agr Sci, Dept Hort, POB 44, SE-23053 Alnarp, SWEDEN |
Title |
Organically fertilized onions (Allium cepa L.): Effects of the fertilizer placement method on quercetin content and soil nitrogen dynamics |
Source. Vol.(no):Page |
Journal of Agricultural and Food Chemistry.56(2):361-367p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
SWEDEN, Europe |
Abstracts |
Field-cured onions cv. Hyskin (Allium cepa L.) supplied with organic nitrogen
fertilizer were studied. The fertilizer was applied by broadcasting and harrowing, broadcasting
and rotary cultivation, or placement between rows. Nitrogen dynamics were monitored throughout
the growing season by soil sampling. Variation in quercetin content in the onion scales was
analyzed by HPLC. The organically fertilized onions were compared with inorganically fertilized
onions grown in the same field. Inoculation with arbuscular mycorrhizal fungi (AMF) in the row at
sowing or during commercial transplant production was tested but did not significantly affect
mycorrhizal root colonization levels in the field. Onions that received no fertilizer at all or
that had fertilizer placed between rows had better establishment, probably due to more favorable
soil nitrogen concentrations for seedling emergence. Broadcast application led to higher nitrogen
concentration in the root zone, resulting in fewer but larger individual onions. Quercetin levels
were not significantly altered as a result of nitrogen fertilizer source (inorganic or organic),
application method, or mycorrhizal inoculation. However, variation between years was significant,
with quercetin levels in 2004 almost twice as high as those in 2005. |