Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-165
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model evaluation paper
15 Aug 2016
Review status
This discussion paper has been under review for the journal Geoscientific Model Development (GMD). The revised manuscript was not accepted.
Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria
OrevaOghene Aliku and Suarau O. Oshunsanya Department of Agronomy, University of Ibadan, Nigeria
Abstract. Soil available water (SAW) affects soil nutrients availability and consequently affects crop performance. However, field determination of SAW for effective irrigated farming is laborious, time consuming and expensive. Therefore, experiments were initiated at three agro-ecological zones of Nigeria to compare the measured laboratory and predicted soil available water using SOILWAT model for sustainable irrigated farming.

One hundred and eighty soil samples were collected from the three agro-ecological zones (Savannah, Derived savannah and rainforest) of Nigeria and analysed for physical and chemical properties. Soil texture and salinity were imputed into SOILWAT model (version 6.1.52) to predict soil physical properties for the three agro-ecological zones of Nigeria. Measured and predicted values of field capacity, permanent wilting point and soil available water were compared using T-test.

Predicted soil textural classes by SOILWAT model were similar to the measured laboratory textural classes for savannah, derived savannah and rainforest zones. However, bulk density, maximum water holding capacity, permanent wilting point and soil available water were poorly predicted as significant (p < 0.05) differences existed between measured and predicted values. Therefore, SOILWAT model could be adopted for predicting soil texture for savannah, derived savannah and rainforest zones of Nigeria. However, the model needs to be upgraded in order to accurately predict soil water characteristics of the aforementioned locations for sustainable irrigation planning.


Citation: Aliku, O. and Oshunsanya, S. O.: Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-165, 2016.
OrevaOghene Aliku and Suarau O. Oshunsanya
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
SC1: 'Executive Editor Comment on "Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria"', Astrid Kerkweg, 22 Aug 2016 Printer-friendly Version 
AC1: 'Response to Interactive comment by Dr Astrid Kerkweg on “Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria” by OrevaOghene Aliku and Suarau O. Oshunsanya', OrevaOghene Aliku, 24 Aug 2016 Printer-friendly Version 
 
RC1: 'Referee Comment', Anonymous Referee #1, 02 Sep 2016 Printer-friendly Version 
AC2: 'Response to Interactive comment by Anonymous Reviewer #1 on “Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria” by OrevaOghene Aliku and Suarau O. Oshunsan', OrevaOghene Aliku, 11 Oct 2016 Printer-friendly Version Supplement 
AC4: 'Response to Interactive comment by Reviewer 1 on “Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria” by OrevaOghene Aliku and Suarau O. Oshunsanya', OrevaOghene Aliku, 11 Oct 2016 Printer-friendly Version 
 
RC2: 'Interactive comment on “Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria” by OrevaOghene Aliku and Suarau O. Oshunsanya', Anonymous Referee #2, 10 Sep 2016 Printer-friendly Version 
AC3: 'Response to Interactive comment by Reviewer 2 on “Establishing relationship between measured and predicted soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria” by OrevaOghene Aliku and Suarau O. Oshunsanya', OrevaOghene Aliku, 11 Oct 2016 Printer-friendly Version 
OrevaOghene Aliku and Suarau O. Oshunsanya
OrevaOghene Aliku and Suarau O. Oshunsanya

Viewed

Total article views: 194 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
128 53 13 194 4 15

Views and downloads (calculated since 15 Aug 2016)

Cumulative views and downloads (calculated since 15 Aug 2016)

Viewed (geographical distribution)

Total article views: 194 (including HTML, PDF, and XML)

Thereof 194 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 23 May 2017
Publications Copernicus
Download
Share