Details
| Original language | English |
|---|---|
| Article number | e20319 |
| Journal | Vadose zone journal |
| Volume | 23 |
| Issue number | 3 |
| Publication status | Published - 12 May 2024 |
Abstract
The understanding of the impact of nitrogen (N) fertilization on the field water cycle and corresponding water use efficiency (WUE) is very important for optimizing fertilization rates and conserving stressed water resources. We modeled soil moisture dynamics of maize (Zea mays L.), finger millet (Eleusine coracana Gaertn.), and lablab [Lablab purpureus (L.) Sweet] plots using calibrated HYDRUS-1D model on two experimental sites (rain-fed and irrigated) for three seasons under different N treatments. The results indicate that the effects of N depended on plant specific properties such as N-fixation and drought tolerance, and on plant available water content governed by soil structure and rainfall seasonal variability. Maize WUE of plots which received 150 kg/ha of urea (46 (Formula presented.) N) were 10–30 kg/ha/mm higher than plots which received none; likewise, millet that received 50 kg/ha of urea had a 7–10 kg/ha/mm higher WUE than control plots in both experiments. However, differences in water cycle components were noticeable between N treatments only in the rain-fed experiment, where higher N levels led to around 60 and 30 mm higher transpiration, 30 and 20 mm lower evaporation, and 30 and 15 mm lower percolation per season for maize and millet, respectively. In 2018, which was the driest year, the difference in maize WUE between the high and low N treatments was only 1 kg/ha/mm, which corresponded with low actual to potential transpiration ratios ((Formula presented.)). This indicates higher sensitivity of maize to water stress compared to the other crops. The results of lablab indicate a positive impact of N fertilization on WUE only under water-limited conditions.
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Vadose zone journal, Vol. 23, No. 3, e20319, 12.05.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modeling N fertilization impact on water cycle and water use efficiency of maize, finger-millet, and lablab crops in South India
AU - Almawazreh, Albara
AU - Uteau, Daniel
AU - Subbarayappa, C. T.
AU - Buerkert, Andreas
AU - Lehmann, Sybille
AU - Peth, Stephan
N1 - Publisher Copyright: © 2024 The Authors. Vadose Zone Journal published by Wiley Periodicals LLC on behalf of Soil Science Society of America.
PY - 2024/5/12
Y1 - 2024/5/12
N2 - The understanding of the impact of nitrogen (N) fertilization on the field water cycle and corresponding water use efficiency (WUE) is very important for optimizing fertilization rates and conserving stressed water resources. We modeled soil moisture dynamics of maize (Zea mays L.), finger millet (Eleusine coracana Gaertn.), and lablab [Lablab purpureus (L.) Sweet] plots using calibrated HYDRUS-1D model on two experimental sites (rain-fed and irrigated) for three seasons under different N treatments. The results indicate that the effects of N depended on plant specific properties such as N-fixation and drought tolerance, and on plant available water content governed by soil structure and rainfall seasonal variability. Maize WUE of plots which received 150 kg/ha of urea (46 (Formula presented.) N) were 10–30 kg/ha/mm higher than plots which received none; likewise, millet that received 50 kg/ha of urea had a 7–10 kg/ha/mm higher WUE than control plots in both experiments. However, differences in water cycle components were noticeable between N treatments only in the rain-fed experiment, where higher N levels led to around 60 and 30 mm higher transpiration, 30 and 20 mm lower evaporation, and 30 and 15 mm lower percolation per season for maize and millet, respectively. In 2018, which was the driest year, the difference in maize WUE between the high and low N treatments was only 1 kg/ha/mm, which corresponded with low actual to potential transpiration ratios ((Formula presented.)). This indicates higher sensitivity of maize to water stress compared to the other crops. The results of lablab indicate a positive impact of N fertilization on WUE only under water-limited conditions.
AB - The understanding of the impact of nitrogen (N) fertilization on the field water cycle and corresponding water use efficiency (WUE) is very important for optimizing fertilization rates and conserving stressed water resources. We modeled soil moisture dynamics of maize (Zea mays L.), finger millet (Eleusine coracana Gaertn.), and lablab [Lablab purpureus (L.) Sweet] plots using calibrated HYDRUS-1D model on two experimental sites (rain-fed and irrigated) for three seasons under different N treatments. The results indicate that the effects of N depended on plant specific properties such as N-fixation and drought tolerance, and on plant available water content governed by soil structure and rainfall seasonal variability. Maize WUE of plots which received 150 kg/ha of urea (46 (Formula presented.) N) were 10–30 kg/ha/mm higher than plots which received none; likewise, millet that received 50 kg/ha of urea had a 7–10 kg/ha/mm higher WUE than control plots in both experiments. However, differences in water cycle components were noticeable between N treatments only in the rain-fed experiment, where higher N levels led to around 60 and 30 mm higher transpiration, 30 and 20 mm lower evaporation, and 30 and 15 mm lower percolation per season for maize and millet, respectively. In 2018, which was the driest year, the difference in maize WUE between the high and low N treatments was only 1 kg/ha/mm, which corresponded with low actual to potential transpiration ratios ((Formula presented.)). This indicates higher sensitivity of maize to water stress compared to the other crops. The results of lablab indicate a positive impact of N fertilization on WUE only under water-limited conditions.
UR - http://www.scopus.com/inward/record.url?scp=85188438217&partnerID=8YFLogxK
U2 - 10.1002/vzj2.20319
DO - 10.1002/vzj2.20319
M3 - Article
AN - SCOPUS:85188438217
VL - 23
JO - Vadose zone journal
JF - Vadose zone journal
SN - 1539-1663
IS - 3
M1 - e20319
ER -