A simulation model assisted study on water and nitrogen dynamics and their effects on crop performance in the wheat-maize system: (II) model calibration, evaluation and simulated experimentation

doi:10.1007/s11703-009-0025-y

Front Agric Chin

2009, Vol. 3

Issue (2) : 109-121 https://doi.org/10.1007/s11703-009-0025-y

RESEARCH ARTICLE

A simulation model assisted study on water and nitrogen dynamics and their effects on crop performance in the wheat-maize system: (II) model calibration, evaluation and simulated experimentation

Hongzhan Lü¹, Weili LIANG¹(

), Guiyan WANG¹, David J. CONNOR², Glyn M. RIMMINGTON²

1. Department of Agronomy, Agricultural University of Hebei, Baoding 071001, China; 2. School of Agriculture and Food Systems, The University of Melbourne, Victoria 3010, Australia; 3. Office of Global Learning, Wichita State University, Wichita, KS 67206, USA

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Abstract

The test on the model with data collected from two years’ field experiments revealed an ability to satisfactorily simulate crop parameters such as LAI, biomass accumulation and partitioning, yield, and variables influencing crop growth and development as nitrogen uptake by crops and partitioning in different organs, and dynamics of soil water and nitrogen including infiltration and leaching. With the model, crop yield, water use efficiency (WUE), nitrogen use efficiency (NYE) and water-nitrogen leaching at specific soil layers under various water and nitrogen management practices were simulated to provide data used as references for designing sustainable nitrogen and water management practices.

The outputs of the simulated experiment with various treatments of irrigation and nitrogen application indicated that crop yield was closely related to water and nitrogen application, crop water use was positively related to irrigation amount, and nitrogen fertilization could improve the crop water use and WUE within certain limits. This is a valuable evidence to be considered in water-saving farming. Nitrogen uptake had a positive relation to nitrogen application, while irrigation to some extent improved its uptake by crops and hence increased NYE. Additionally, irrigation and fertilization had great effects on nitrogen leaching. Thus, in order to improve WUE and NYE, the model showed how nitrogen application and irrigation should be well coordinated.

Keywords wheat maize cropping system water nitrogen simulation model

Corresponding Author(s): LIANG Weili,Email:wayleel@hotmail.com

Issue Date: 05 June 2009

Cite this article:

Hongzhan Lü,Weili LIANG,Guiyan WANG, et al. A simulation model assisted study on water and nitrogen dynamics and their effects on crop performance in the wheat-maize system: (II) model calibration, evaluation and simulated experimentation[J]. Front Agric Chin, 2009, 3(2): 109-121.

URL:

https://academic.hep.com.cn/fag/EN/10.1007/s11703-009-0025-y
https://academic.hep.com.cn/fag/EN/Y2009/V3/I2/109

Tab.1 Soil characteristics of the experimental field

Tab.2 Precipitation during the experimental years(mm)

Tab.3 Irrigation and nitrogen treatments (1997-1998)

Tab.4 Irrigation and nitrogen treatments (1999-2000)

Tab.5 Comparison of simulated and observed phenostage dates

Tab.6 Comparison of simulated and observed yields in various treatments (kg·hm)

Fig.1 Comparison of simulated and measured LAI (II 1997-1998)

Fig.2 Comparison of simulated and measured LAI (I1F2 1999-2000)
Note: R, FL and EH represent green-recovering, flagging and ear-heading, respectively.

Fig.3 Comparison of simulated and measured biomass (I1F2 1999-2000)

Fig.4 Comparison of simulated and measured soil moisture content in treatment level II at 120 cm soil depth (1997-1998)

Fig.5 Comparison of simulated and measured soil moisture content in treatment level II at 200 cm soil depth (1997-1998)

Fig.6 Comparison of simulated and measured soil moisture content in treatment level I1F2 at 120 cm soil depth (1999-2000)

Fig.7 Comparison of simulated and measured soil moisture content in treatment level I1F2 at 200 cm soil depth (1999-2000)

Fig.8 Comparison of simulated and measured moisture content at different soil layers in treatment I1F2 (1999-2000)

Fig.9 Comparison of simulated and measured -N content at different soil layers in treatment I1F2 (1999-2000)

Fig.10 Simulated and measured grain nitrogen content in different treatment (1999-2000)

Fig.11 Simulated and measured leaf nitrogen content in treatment I1F2 (1999-2000)
Note: 3L is 3 leaves and SI is silking.

Tab.7 Treatment details of the virtual experiment

Tab.8 Simulated crop yields under various water and nitrogen treatment levels (kg?hm)

Tab.9 Crop water use and WUE under various water and nitrogen treatments

Tab.10 Simulated NYE and nitrogen uptake of different water and nitrogen treatments

Fig.12 Nitrate and water down flow at 90 cm soil depth in various water (a) and fertilizer (b) treatment levels

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