Test of the natural 15N abundance method to estimate the effect of the legume Canavalia ensiformis (canavalia) nitrogen transfer on the associated Musa acuminata (banana) nitrogen nutrition
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Abstract
practice to increase nitrogen (N) content in the soil and
associated crop, and so to reduce the use of fertilizers. The
aim of this study was to test how useful the natural 15N
abundance method is for estimating this increment. A
greenhouse trial was carried out in pots with canavalia-banana
association, in order to evaluate N transfer via exudates
and root decomposition after cutting the aboveground parts.
Estimations were recorded by a box model including isotopic
fractionation in the soil and banana plants. The contribution
of the total N taken up by banana was: 5 % from canavalia
exudates, 53 % released from root decomposition and 42 %
from the soil. Root exudate contribution was relatively low
due to a strong competition between canavalia and banana,
mainly for the available soil phosphorus. 15N content of the
youngest banana half-leaf showed a high correlation with 15N
content of the entire plant. This indicated that the youngest
leaf may be a useful index to estimate leguminous N transfer.
Both, N transfer determination along canavalia growing cycle
and the evaluation of the actual N transfer rate need to be
calibrated under field conditions for each type of soils.
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