Impacts of use of observed and exponential functions of root distribution in soil on water utilization and yield of wheat, simulated with a crop model
  • 【DOI】

    10.1080/03650340.2014.903560

  • 【摘要】

    The suitability of two exponential distribution functions for the description of winter wheat root length distribution in a soil profile was examined. The impact of use of both the observed and fitted... 展开>>The suitability of two exponential distribution functions for the description of winter wheat root length distribution in a soil profile was examined. The impact of use of both the observed and fitted distribution functions as input parameters for simulation of wheat growth with the Crop Environment Resource Synthesis-Wheat crop model was determined. The fit between the observed and root distribution predicted with exponential functions was significant in all cases (R2?>?0.79, p?R2?>?0.9). The simulation of the wheat crop growth was performed with 20 years’ daily meteorological data for clay-loam and loamy-sand soils. The impacts of using the observed or fitted exponential root distributions on growth and root distribution simulated with the crop model was negligible in those cases with a fit over about R2?>?0.9. In two cases with the worst fit (R2?=?0.79 and 0.82), the available water was reduced especially in sandy-loam soil, on average of years by 15?mm. On average, wheat yields decreased by 304 and 60?kg?ha?1 for sandy-loam and clay-loam soils when the fitted exponential distributions were used compared with the observed ones. 收起<<

  • 【作者】

  • 【刊期】

    Archives of Agronomy and Soil Science 2014年11期

  • 【语种】

    eng