Modeling cation exchange capacity and soil water holding capacity from basic soil properties

Authors : Idowu Olorunfemi, Johnson Fasinmirin, Adefemi Ojo

Pages : 266-274

Doi:10.18393/ejss.2016.4.266-274

View : 11 | Download : 6

Publication Date : 2016-09-09

Article Type : Research Paper

Abstract :Cation exchange capacity insert ignore into journalissuearticles values(CEC); is a good indicator of soil productivity and is useful for making recommendations of phosphorus, potassium, and magnesium for soils of different textures. Soil water holding capacity insert ignore into journalissuearticles values(SWHC); defines the ability of a soil to hold water at a particular time of the season. This research predicted CEC and SWHC of soils using pedotransfer models developed insert ignore into journalissuearticles values(using Minitab 17 statistical software); from basic soil properties insert ignore into journalissuearticles values(Sandinsert ignore into journalissuearticles values(S);, Clayinsert ignore into journalissuearticles values(C);, soil pH, soil organic carbon insert ignore into journalissuearticles values(SOC);); and verify the model by comparing the relationship between measured and estimated insert ignore into journalissuearticles values(obtained by PTFs); CEC and SWHC in the Forest Vegetative Zone of Nigeria. For this study, a total of 105 sampling points in 35 different locations were sampled in the study areas. Three sampling points were randomly selected per location and three undisturbed samples were collected at each sampling point. The results showed success in predicting CEC and SWHC from basic soil properties. In this study, five linear regression models for predicting soil CEC and seven linear regression models for predicting SWHC from some soil physical and chemical properties were suggested. Model 5 [CEC = -13.93+2.645 pH +0.0446 C insert ignore into journalissuearticles values(%);+2.267 SOC insert ignore into journalissuearticles values(%);] was best for predicting CEC while model 12 [SWHC insert ignore into journalissuearticles values(%);=36.0- 0.215 S insert ignore into journalissuearticles values(%);+0.113 C insert ignore into journalissuearticles values(%);+10.36 SOC insert ignore into journalissuearticles values(%);] is the most acceptable model for predicting SWHC. 
Keywords : Cation exchange capacity, soil water holding capacity, pedotransfer function, multiple linear regression, Nigeria