ISSN:
1432-2285
Keywords:
Mineral nutrition
;
Xylem sap
;
Nitrogen isotope
;
Juglans regia
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Nitrogen (N) derived from both the soil during current-year uptake, and the withintree pool of storage N was distinguished in two groups of “Serr” walnut trees using labeled fertilizer (15N-depleted ammonium sulfate) applied in different years. Mass spectrometric analysis of N in xylem sap collected periodically in spring allowed quantification of the relative contributions of N from storage and current season uptake and the transition in N usage from previously assimilated (storage) N to the onset of current season uptake of soil N. N derived from storage accounted for 〉 50% of the xylem sap N during the staminate and pistillate bloom periods and throughout the period of spur leaf expansion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00202395
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