HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by López-Cedrón, F. X. Articles by Sau, F. Search for Related Content PubMed Articles by López-Cedrón, F. X. Articles by Sau, F. Agricola Articles by López-Cedrón, F. X. Articles by Sau, F. Related Collections Water Stress Maize Crop Models

Improving the CERES-Maize Model Ability to Simulate Water Deficit Impact on Maize Production and Yield Components

^a (Consellería do Medio Rural, 27003 Lugo) Dep. de Producción Vexetal, Univ. de Santiago de Compostela, Campus Univ., 27002 Lugo, Spain
^b (CIAM, Apdo. 10, 15080 A Coruña), Dep. de Producción Vexetal, Univ. de Santiago de Compostela, Campus Univ., 27002 Lugo, Spain
^c Dep. of Agronomy, Univ. of Florida, Gainesville, FL 32611
^d Dep. de Biología Vegetal, Escuela Técnica Superior de Ingenieros Agrónomos, Univ. Politécnica de Madrid, Avenida de la Complutense s/n, 28040 Madrid, Spain

View larger version (17K): [in this window] [in a new window]   Fig. 1. Simulated vs. measured values of: (a) total biomass at harvest and (b) grain yield, for rainfed and irrigated treatments, using two different evapotranspiration (ET) options and modifications of the CERES-Maize V.4.0 model. 1. Default Priestley-Taylor (PT) ET option with KEP coefficient for partitioning between evaporation and transpiration equal to 0.685 (PT-KEP = 0.685); 2. Penman–Monteith FAO56 ET option with a KEP = 0.500, Kc = 1.00 and with Edmeades equation to compute grain number per plant with no direct soil water effect on grain growth (PFAO56-Final). Each point represents the mean of four replicates.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Observed (points) and simulated (lines) dynamics of total biomass and grain yield of four rainfed treatments (1998; 1999-first, 2000-first and 2001) using different ET options and modifications of the CERES-Maize V.4.0 model. 1. Default Priestley-Taylor (PT) ET option with KEP coefficient for partitioning between evaporation and transpiration equal to 0.685 (PT-KEP = 0.685); 2. PT ET option with a KEP = 0.500; 3. Penman–Monteith FAO56 ET option with a KEP = 0.500 and Kc = 1.00 (PFAO56-KEP = 0.500); 4. Identical to (3) with Edmeades equation to compute grain number per plant with no direct soil water effect on grain growth (PFAO56-Final). Each point (triangle, biomass; circle, grain yield) represents the mean of four replicates.

View larger version (24K): [in this window] [in a new window]   Fig. 3. Observed (points) and simulated (lines) dynamics of the soil water content of different soil layers during 2001 rainfed growing season, using different evapotranspiration (ET) options and modifications of the CERES-Maize V.4.0 model. 1. Default Priestley-Taylor (PT) ET option with KEP coefficient for partitioning between evaporation and transpiration equal to 0.685 (PT-KEP = 0.685); 2. PT ET option with a KEP equal to 0.500 (PT-KEP = 0.500); 3. Penman–Monteith FAO56 ET option with KEP = 0.500 and Kc = 1.00 (PFAO56-KEP = 0.500). Each point represents the mean of three replicates.

View larger version (16K): [in this window] [in a new window]   Fig. 4. The simulated seed number per plant (GPP) vs. average rate of photosynthesis per plant from anthesis to beginning effective grain-filling period (mg [CH2O] plant–1 d–1) (PSKER) with current function (continuous line) and Edmeades function (discontinuous line). Symbols represent simulated GPP of the seven rainfed treatments with (open) current and (closed) Edmeades function. Model was run with the following option: Penman–Monteith FAO56 ET option with a KEP = 0.500 and Kc = 1.00 (PFAO56-KEP = 0.500).

View larger version (23K): [in this window] [in a new window]   Fig. 5. Measured and simulated values of seed number per unit land area for rainfed and irrigated treatments using different evapotranspiration (ET) options and modifications of the CERES-Maize V.4.0 model. 1. Default Priestley-Taylor (PT) ET option with KEP coefficient for partitioning between evaporation and transpiration equal to 0.685 (PT-KEP = 0.685); 2. Penman–Monteith FAO56 ET option with a KEP = 0.500, Kc = 1.00 and Edmeades equation to compute grain number per plant with no direct soil water effect on grain growth (PFAO56-Final). Each point represents the mean of four replicates.