NDLI: Relationship between rate of crop growth at date of fertiliser N application and fate of fertiliser N applied to winter wheat

Content Provider	Springer Nature Link
Author	Limaux, François Recous, Sylvie Meynard, Jean Marc Guckert, Armand
Copyright Year	1999
Abstract	To investigate the relationship between the timing of fertiliser N applications and the N use efficiency of wheat, three field experiments with $^{15}$N were set up on winter wheat, on three different soils in France. Different crop N demands on the day of fertiliser application were obtained by varying either crop densities or date of fertiliser application. Labelled $^{15}$NH$_{4}$ $^{15}$NO$_{3}$ was applied at tillering and during stem elongation. The $^{15}$N recovered from plant and soil at different dates after $^{15}$N addition and at maturity of wheat was measured. The fate of fertiliser N was rapidly determined, most of the fertiliser N accumulated in the wheat at maturity having been taken up within a few days of application. $^{15}$N recovery by the crop at final harvest (%) varied greatly (19–55% N applied) according to crop density, soil type and date of application. It was linearly related to the instantaneous crop growth rate calculated at the day of $^{15}$N application. The amount of fertiliser N immobilised in the soil was constant at 20 kg N ha$^{−1}$, for all soil types and crop densities. Because residual mineral $^{15}$N in the soil at harvest was negligible and immobilisation was constant, the level of total $^{15}$N measured in the different N pools (soil+plant) reflected the% $^{15}$N uptake by the plant. There was consequently a negative linear relationship between the percentage of $^{15}$N not recovered for measurement, and crop growth rate (i.e. crop N demand) at date of fertiliser application. These results suggest that crop N demand at the time of N application determines the ability of the crop to compete for N with other processes, and may be a major factor determining the division of N between soil and crop.
Starting Page	49
Ending Page	59
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	214
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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