NDLI: Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve

Content Provider	Springer Nature Link
Author	Reyes, Julian Schellberg, Jürgen Siebert, Stefan Elsaesser, Martin Adam, Jennifer Ewert, Frank
Copyright Year	2015
Abstract	The nitrogen (N) dilution curve is a useful tool for farmers to assess the effectiveness of fertilizer application. The N dilution curve describes the decrease in plant N as biomass increases. This concept has not yet been tested for its applicability and robustness under different cutting regimes in grasslands. We conducted a principal components analysis on biomass yield and N concentration data to discern relationships among experimental, climatic, and management factors. Next, two N dilution curve parameters were calibrated for different cutting frequencies. We compared N uptake using four different methods utilizing calibrated N dilution curves, a reference curve, and different cutting regimes representing different physiological ages of the crops at cutting. Our results show that excluding cutting frequency information overestimates values of N uptake. Calibration of the N dilution curve according to cutting frequency improves N uptake estimates relative to observed values. Therefore, N uptake is better estimated using both the N dilution curve and the cutting regime information.
Starting Page	1561
Ending Page	1570
Page Count	10
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	35
Issue Number	4
e-ISSN	17730155
Language	English
Publisher	Springer Paris
Publisher Date	2015-06-18
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrogen dilution curve Critical nitrogen uptake Critical nitrogen concentration Grassland management Cutting Empirical modeling Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve

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Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve (Reyes et al. 2015), 35:1561–1570

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Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve

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