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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   Fall 2003 , Volume 9 , Number 3; Page(s) 35 To 54.
 
Paper: 

SIMULATION OF SOIL MOISTURE PROFILE BY LEACHM MODEL

 
 
Author(s):  JOLEYNI M., KAVEH F., PAZIRA ABD ALRAHIM, PAREHKAR M., ABEDI M.J.
 
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Abstract: 

The growing interest in simulation of water movements in soils is in response to the need for development of solutions for various agricultural and environment problems, such as irrigation. In order to be able to adapt models for simulation, it is important that the capabilities of these models and credibility of their results be tested. In this study results from LEACHM simulation model are compared with the measured soil water data. We carried out an experiment in Khorasan Agriculture Research Center, which included three treatments: 1- crop was irrigated when Maximum Allowable Deficiency (MAD) corresponded to 50%, 2- crop was irrigated when MAD corresponded to 70% and 3- crop was irrigated once, then irrigation was stopped until MAD corresponded to 90%, after that crop was irrigated normally. A sensitivity analysis was performed to identify the input parameters of LEACHM, which most influence the water content variations. Sensitivity analysis showed that bulk density has an important effect on soil water content. Simulated soil water contents were in close agreement with measured values with a mean absolute error (MAE) between measured and predicted soil water contents, ranging from 1.87 to 4.54% in treatment one, 1.90 to 3.11% in treatment 2 and 3.98 to 5.58% in treatment 3. Generally, the model overestimated water contents.

 
Keyword(s): WATER MOVEMENT IN SOIL, MODEL, WATER STRESS, SIMULATION OF MOISTURE, SUGAR BEET, LEACHM
 
References: 
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