Implementing the dual crop coefficient approach in interactive software. 1. Background and computational strategy

被引:165
作者
Rosa, Ricardo D. [1 ]
Paredes, Paula [1 ]
Rodrigues, Goncalo C. [1 ]
Alves, Isabel [1 ]
Fernando, Rui M. [1 ]
Pereira, Luis S. [1 ]
Allen, Richard G. [2 ]
机构
[1] Univ Tecn Lisboa, Inst Agron, CEER Biosyst Engn, P-1349017 Lisbon, Portugal
[2] Univ Idaho, Kimberly, ID 83341 USA
基金
美国国家科学基金会;
关键词
Crop evapotranspiration; Basal crop coefficient; Soil evaporation; Irrigation scheduling; Soil water balance; Simulation model; SIMULATE YIELD RESPONSE; WATER-BALANCE; ESTIMATING EVAPORATION; ROOT-ZONE; IRRIGATION; EVAPOTRANSPIRATION; MODEL; SOIL; WHEAT; PRODUCTIVITY;
D O I
10.1016/j.agwat.2011.10.013
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Irrigation planning and scheduling require the availability of modeling tools that are accurate, quick and easy to use. The crop coefficient (K-c)-reference evapotranspiration (ET) method is a traditional method for estimating ET, but has become relatively complicated with the introduction of the dual K-c procedure. The dual crop coefficient approach (K-cb+K-e) gives a better estimation of daily crop evapotranspiration because it separately considers soil evaporation and crop transpiration. This approach allows one to plan irrigation schedules properly, especially in the case of crops that do not completely cover the soil, where evaporation from the soil surface may be substantial. The SIMDualKc software application was developed with the purpose of simplifying implementation of the computation of the crop coefficient and crop evapotranspiration using the dual crop coefficient approach over a range of cultural practices and to provide ET information for use in irrigation scheduling and hydrologic water balances. The model performs a soil water balance at the field level using a daily time step. It estimates crop transpiration and soil evaporation as well as soil water dynamics to support irrigation scheduling for full and incomplete cover crops. This paper is the first part of a two-part series, where the second part describes model testing and application for various crops, locations and irrigation management issues. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:8 / 24
页数:17
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