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A model to assess nitrogen limitations on the growth and yield of spring wheat
Year:
1992
Source of publication :
Field Crops Research
Authors :
Amir, Jacob
;
.
Volume :
30
Co-Authors:
Sinclair, T.R., USDA-ARS, Agron. Physiol. Lab., University of Florida, Gainesville, FL 32611, United States
Amir, J., Agricultural Research Organization, Gilat Experiment Station, Mobile Post Negev 2, 85-200, Israel
Facilitators :
From page:
63
To page:
78
(
Total pages:
16
)
Abstract:
Under many conditions the availability of soil nitrogen imposes an important constraint on wheat (Triticum aestivum L.) yields. In this paper a simple, mechanistic model of spring-wheat growth and yield was proposed to account for nitrogen uptake and use by the crop. A soil nitrogen balance was developed so that crop nitrogen uptake was restrained when the available mineral nitrogen in the soil was exhausted. The crop nitrogen uptake rate was calculated as a function of cumulative thermal units. Leaf area development and maintenance, radiation-use efficiency, and stem growth were assumed to depend on accumulated nitrogen. Seed growth resulted in nitrogen transfer from leaves and stems to the seeds. The model was compared against data collected in nine years of experimentation at Gilat, Israel. Good agreement between observed and simulated yields was obtained for varying nitrogen fertilizer treatments (r2=0.94) and levels of soil nitrogen following fallow (r2=0.93). © 1992.
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DOI :
10.1016/0378-4290(92)90057-G
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
18725
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:23
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Scientific Publication
A model to assess nitrogen limitations on the growth and yield of spring wheat
30
Sinclair, T.R., USDA-ARS, Agron. Physiol. Lab., University of Florida, Gainesville, FL 32611, United States
Amir, J., Agricultural Research Organization, Gilat Experiment Station, Mobile Post Negev 2, 85-200, Israel
A model to assess nitrogen limitations on the growth and yield of spring wheat
Under many conditions the availability of soil nitrogen imposes an important constraint on wheat (Triticum aestivum L.) yields. In this paper a simple, mechanistic model of spring-wheat growth and yield was proposed to account for nitrogen uptake and use by the crop. A soil nitrogen balance was developed so that crop nitrogen uptake was restrained when the available mineral nitrogen in the soil was exhausted. The crop nitrogen uptake rate was calculated as a function of cumulative thermal units. Leaf area development and maintenance, radiation-use efficiency, and stem growth were assumed to depend on accumulated nitrogen. Seed growth resulted in nitrogen transfer from leaves and stems to the seeds. The model was compared against data collected in nine years of experimentation at Gilat, Israel. Good agreement between observed and simulated yields was obtained for varying nitrogen fertilizer treatments (r2=0.94) and levels of soil nitrogen following fallow (r2=0.93). © 1992.
Scientific Publication
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