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United States Department of Agriculture

Agricultural Research Service

Title: CALIBRATION OF A POTATO GROWTH MODEL FOR PREDICTION OF NITROGEN DYNAMICS IN POTATO SYSTEMS IN THE PACIFIC NORTHWEST)

Author
item Marcos, Javier
item Stockle, Claudio
item Alva, Ashok
item Timlin, Dennis
item Reddy, Vangimalla

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2005
Publication Date: 11/1/2005
Citation: Marcos, J., Stockle, C., Alva, A.K., Timlin, D.J., Reddy, V. 2005. Calibration of a potato growth model for prediction of nitrogen dynamics in potato systems in the pacific northwest. ASA-CSSA-SSSA Annual Meeting Abstracts. On CD.

Interpretive Summary:

Technical Abstract: Tools to improve nitrogen (N) management for potatoes in the Pacific Northwest (PNW) are desirable in view of the concern on non-point source pollution of nitrate into groundwater in the Columbia Basin production region which is characterized by sandy soils and possible N inputs in excess of crop N requirement. A potato growth model was developed and integrated into the multi-year, multi-crop simulation model CropSystVB to improve overall model capabilities for the assessment of N fate under different nitrogen and irrigation regimes in potato systems. In the integrated model, CropSystVB simulates the soil-water-plant-atmosphere system for a crop rotation, as well as the soil water and nitrogen budgets. When the crop in rotation is potato, the potato model simulates potato growth and development and plant carabon and N balances. A field experiment was conducted to obtain crop data required to parameterize the potato crop model under different levels of N and irrigation. Model simulations were compared to seasonally measured data of dry matter, leaf area index, plant N and yield of potatoes grown with 3 levels of applied N (168, 336, and 504 kg/ha) and 2 levels of applied water (100 and 75% ET). Results showed that the model simulated plant N and dry matter partition and yields adequately. Improved accuracy in the simulation of potato N and carbon balances by the integrated model demonstrates that this model can be used to predict soil and plant N dynamics and production of potato-based cropping systems.

Last Modified: 8/24/2016
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