Trade-off between blue and grey water footprint of crop production at different nitrogen application rates under various field management practices

Abebe D. Chukalla (Corresponding Author), Martinus S. Krol, Arjen Y. Hoekstra

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Abstract

In irrigated crop production, nitrogen (N) is often applied at high rates in order to maximize crop yield. With such high rates, the blue water footprint (WF) per unit of crop is low, but the N-related grey WF per unit of crop yield is relatively high. This study explores the trade-off between blue and grey WF at different N-application rates (from 25 to 300 kg N ha −1 y −1) under various field management practices. We first analyse this trade-off under a reference management package (applying inorganic-N, conventional tillage, full irrigation). Next, we estimate the economically optimal N-application rate when putting a price to pollution. Finally, we consider the blue-grey WF trade-off for other management packages, a combination of inorganic-N or organic-N with conventional tillage or no-tillage, and full or deficit irrigation. We use the APEX model to simulate soil water and N balances and crop growth. As a case study, we consider irrigated maize on loam soil for the period 1998–2012 in a semi-arid environment in Spain. The results for the reference package show that increasing N application from 50 to 200 kg N ha −1, with crop yield growing by a factor 3, involves a trade-off, whereby the blue WF per tonne declines by 60% but the N-related grey WF increases by 210%. Increasing N application from 25 to 50 kg N ha −1, with yield increasing by a factor 2, is a no-regret move, because blue and grey WFs per tonne are reduced by 40% and 8%, respectively. Decreasing N application from 300 to 200 kg N ha −1 is a no-regret move as well. The minimum blue WF per tonne is found at N application of 200 kg N ha −1, with a price of 8 $ kg −1 of N load to water pollution the economically optimal N-application rate is 150 kg N ha −1.

Original languageEnglish
Pages (from-to)962-970
Number of pages9
JournalScience of the total environment
Volume626
Early online date19 Feb 2018
DOIs
Publication statusPublished - 1 Jun 2018

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water footprint
crop production
trade-off
Crops
management practice
Nitrogen
Water
nitrogen
crop yield
Irrigation
tillage
irrigation
Soils
crop
Water pollution
arid environment
zero tillage
rate
loam
water pollution

Cite this

@article{ca546471df104e9580fdf6a3ba313c7c,
title = "Trade-off between blue and grey water footprint of crop production at different nitrogen application rates under various field management practices",
abstract = "In irrigated crop production, nitrogen (N) is often applied at high rates in order to maximize crop yield. With such high rates, the blue water footprint (WF) per unit of crop is low, but the N-related grey WF per unit of crop yield is relatively high. This study explores the trade-off between blue and grey WF at different N-application rates (from 25 to 300 kg N ha −1 y −1) under various field management practices. We first analyse this trade-off under a reference management package (applying inorganic-N, conventional tillage, full irrigation). Next, we estimate the economically optimal N-application rate when putting a price to pollution. Finally, we consider the blue-grey WF trade-off for other management packages, a combination of inorganic-N or organic-N with conventional tillage or no-tillage, and full or deficit irrigation. We use the APEX model to simulate soil water and N balances and crop growth. As a case study, we consider irrigated maize on loam soil for the period 1998–2012 in a semi-arid environment in Spain. The results for the reference package show that increasing N application from 50 to 200 kg N ha −1, with crop yield growing by a factor 3, involves a trade-off, whereby the blue WF per tonne declines by 60{\%} but the N-related grey WF increases by 210{\%}. Increasing N application from 25 to 50 kg N ha −1, with yield increasing by a factor 2, is a no-regret move, because blue and grey WFs per tonne are reduced by 40{\%} and 8{\%}, respectively. Decreasing N application from 300 to 200 kg N ha −1 is a no-regret move as well. The minimum blue WF per tonne is found at N application of 200 kg N ha −1, with a price of 8 $ kg −1 of N load to water pollution the economically optimal N-application rate is 150 kg N ha −1.",
author = "Chukalla, {Abebe D.} and Krol, {Martinus S.} and Hoekstra, {Arjen Y.}",
year = "2018",
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Trade-off between blue and grey water footprint of crop production at different nitrogen application rates under various field management practices. / Chukalla, Abebe D. (Corresponding Author); Krol, Martinus S.; Hoekstra, Arjen Y.

In: Science of the total environment, Vol. 626, 01.06.2018, p. 962-970.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Trade-off between blue and grey water footprint of crop production at different nitrogen application rates under various field management practices

AU - Chukalla, Abebe D.

AU - Krol, Martinus S.

AU - Hoekstra, Arjen Y.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - In irrigated crop production, nitrogen (N) is often applied at high rates in order to maximize crop yield. With such high rates, the blue water footprint (WF) per unit of crop is low, but the N-related grey WF per unit of crop yield is relatively high. This study explores the trade-off between blue and grey WF at different N-application rates (from 25 to 300 kg N ha −1 y −1) under various field management practices. We first analyse this trade-off under a reference management package (applying inorganic-N, conventional tillage, full irrigation). Next, we estimate the economically optimal N-application rate when putting a price to pollution. Finally, we consider the blue-grey WF trade-off for other management packages, a combination of inorganic-N or organic-N with conventional tillage or no-tillage, and full or deficit irrigation. We use the APEX model to simulate soil water and N balances and crop growth. As a case study, we consider irrigated maize on loam soil for the period 1998–2012 in a semi-arid environment in Spain. The results for the reference package show that increasing N application from 50 to 200 kg N ha −1, with crop yield growing by a factor 3, involves a trade-off, whereby the blue WF per tonne declines by 60% but the N-related grey WF increases by 210%. Increasing N application from 25 to 50 kg N ha −1, with yield increasing by a factor 2, is a no-regret move, because blue and grey WFs per tonne are reduced by 40% and 8%, respectively. Decreasing N application from 300 to 200 kg N ha −1 is a no-regret move as well. The minimum blue WF per tonne is found at N application of 200 kg N ha −1, with a price of 8 $ kg −1 of N load to water pollution the economically optimal N-application rate is 150 kg N ha −1.

AB - In irrigated crop production, nitrogen (N) is often applied at high rates in order to maximize crop yield. With such high rates, the blue water footprint (WF) per unit of crop is low, but the N-related grey WF per unit of crop yield is relatively high. This study explores the trade-off between blue and grey WF at different N-application rates (from 25 to 300 kg N ha −1 y −1) under various field management practices. We first analyse this trade-off under a reference management package (applying inorganic-N, conventional tillage, full irrigation). Next, we estimate the economically optimal N-application rate when putting a price to pollution. Finally, we consider the blue-grey WF trade-off for other management packages, a combination of inorganic-N or organic-N with conventional tillage or no-tillage, and full or deficit irrigation. We use the APEX model to simulate soil water and N balances and crop growth. As a case study, we consider irrigated maize on loam soil for the period 1998–2012 in a semi-arid environment in Spain. The results for the reference package show that increasing N application from 50 to 200 kg N ha −1, with crop yield growing by a factor 3, involves a trade-off, whereby the blue WF per tonne declines by 60% but the N-related grey WF increases by 210%. Increasing N application from 25 to 50 kg N ha −1, with yield increasing by a factor 2, is a no-regret move, because blue and grey WFs per tonne are reduced by 40% and 8%, respectively. Decreasing N application from 300 to 200 kg N ha −1 is a no-regret move as well. The minimum blue WF per tonne is found at N application of 200 kg N ha −1, with a price of 8 $ kg −1 of N load to water pollution the economically optimal N-application rate is 150 kg N ha −1.

U2 - 10.1016/j.scitotenv.2018.01.164

DO - 10.1016/j.scitotenv.2018.01.164

M3 - Article

VL - 626

SP - 962

EP - 970

JO - Science of the total environment

JF - Science of the total environment

SN - 0048-9697

ER -