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 Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Naab, J. B. Articles by Marfo, K. O. Search for Related Content PubMed Articles by Naab, J. B. Articles by Marfo, K. O. Agricola Articles by Naab, J. B. Articles by Marfo, K. O. Related Collections Agroclimatology Crop Growth and Development Other Crop Management Crop Models Plant Disease Production Agriculture Crop Ecology

Using the CROPGRO-Peanut Model to Quantify Yield Gaps of Peanut in the Guinean Savanna Zone of Ghana

^a Savanna Agric. Res. Inst., Tamale, Ghana
^b Int. Crops Res. Inst. for the Semi-Arid Tropics (ICRISAT), Patancheru, Andra Pradesh 502 324, India
^c Dep. of Agron., Univ. of Florida, Gainesville, FL 32611-0500
^d Dep. of Agric. and Biol. Eng., Univ. of Florida, Gainesville, FL 32611-0500
^e Deceased, Savanna Agric. Res. Inst., Tamale, Ghana

View larger version (29K): [in a new window]   Fig. 1. Simulated and measured soil water content in the 0- to 30-cm soil profile during the growing season of peanut sown on 22 May 1998. Root mean square error value was 0.0859, 0.0583, and 0.0483 cm cm–3 for 0- to 5-, 5- to 10-, and 15- to 30-cm depths, respectively. Willmott (1981) index of agreement (d value) was 0.513, 0.676, and 0.739 for 0- to 5-, 5- to 10-, and 15- to 30-cm depths, respectively.

View larger version (21K): [in a new window]   Fig. 2. Simulated and measured soil water content in the 30- to 90-cm soil profile during the growing season of peanut sown on 22 May 1998. The root mean square error was 0.0115, 0.0135, and 0.0055 cm cm–3 while the d value was 0.950, 0.836, and 0.877 for 30- to 45-, 45-to 60-, and 60- to 90-cm depths, respectively.

View larger version (30K): [in a new window]   Fig. 3. Simulated and measured plant extractable soil water in the top 90 cm of soil for the four sowing dates during the 1998 season. The root mean square error was 14.3, 20.8, 18.5, and 20.8 mm while the d value was 0.707, 0.728, 0.870, and 0.907 for sowing on 22 May, 19 June, 20 July, and 17 August, respectively.

View larger version (23K): [in a new window]   Fig. 4. Simulated and observed pod harvest index of cultivar Chinese for various sowing dates during the 1997 and 1998 seasons. The root mean square error was 0.0993, and the d value was 0.921 averaged over all dates and years.

View larger version (23K): [in a new window]   Fig. 5. Simulated and observed pod harvest index of cultivar F-Mix for various sowing dates during the 1997 and 1998 seasons. The RMSE was 0.0510, and the d value was 0.975 averaged over all dates and years.

View larger version (23K): [in a new window]   Fig. 6. Simulated and observed leaf mass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1997 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 195 kg ha–1, and the d value was 0.949. Without the defoliation function, the RMSE was 725 kg ha–1, and the d value was 0.561.

View larger version (23K): [in a new window]   Fig. 7. Simulated and observed leaf mass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1998 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 302 kg ha–1, and the d value was 0.925. Without the defoliation function, the RMSE was 386 kg ha–1, and the d value was 0.896.

View larger version (21K): [in a new window]   Fig. 8. Simulated and observed total biomass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1997 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 395 kg ha–1, and the d value was 0.979. Without the defoliation function, the RMSE was 1875 kg ha–1, and the d value was 0.763.

View larger version (19K): [in a new window]   Fig. 9. Simulated and observed pod mass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1997 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 284 kg ha–1, and the d value was 0.971. Without the defoliation function, the RMSE was 826 kg ha–1, and the d value was 0.849.

View larger version (23K): [in a new window]   Fig. 10. Simulated and observed total biomass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1998 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 587 kg ha–1, and the d value was 0.976. Without the defoliation function, the RMSE was 848 kg ha–1, and the d value was 0.959.

View larger version (22K): [in a new window]   Fig. 11. Simulated and observed pod mass of two cultivars, with and without defoliation function (DEF), for the first (D1) and third (D3) sowing dates during the 1998 season. With the defoliation function and over both dates and cultivars, the root mean square error (RMSE) was 221 kg ha–1, and the d value was 0.984. Without the defoliation function, the RMSE was 455 kg ha–1, and the d value was 0.945.