ISSN:
1573-5036
Keywords:
agroforestry
;
interspecies transfer
;
nitrogen
;
nitrogen fixation
;
nutrient cycling
;
pH
;
phosphorus
;
rhizosphere
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Walnut tree seedlings exhibited greater phosphorus (P) uptake from32P-labelled hydroxyapatite when interplanted with alfalfa than with other walnuts, black locust, or orchard grass. Three mechanisms are proposed as possible explanations of this enhnaced P uptake by walnut. In this study, diffusion of solubilized apatite-P to the roots of walnut at points of walnut-alfalfa root intersection is believed to be the operative mechanism. Phosphorus is solubilized due to rhizosphere acidification of alfalfa during nitrogen fixation. These results underscore the interdependence of nutrient cycles. Enhancement of the phosphorus cycle through manipulation of the nitrogen cycle has important implications for world food and fiber production.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02280196
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