Feasibility studies to determine the critical soil water content using electrical resistivity for sugarcane production in Sa Kaeo Province

Name: Bhannapitch Samrit

LCSH: Kasetsart University -- Dissertations. Ph.D. (Soil Science) 2023.

Classification :.LCCS: S667.S9

LCSH: Kasetsart University. -- Department of Soil Science -- Dissertations.

LCSH: Sugarcane -- Soils.

LCSH: Soil moisture.

LCSH: Soil physics.

Abstract: Non-destructive measurements of soil water content (SWC) have been extensively developed in recent decades, particularly in soil science. The measurement based on soil electrical resistivity (SER) is simple, reliable, and shows a clear relationship between SWC and SER. This study illustrates the application of a new method using a basic understanding of the principle of SER to determine SWC in the laboratory using standard methods. The study comprises three experiments: Experiment I Evaluation of available soil water capacity in different textured sugarcane growing soils using the RETC program. This study aimed to compare the assessment method of Field capacity (FC) by hydraulic parameters from soil water retention curve (SWRC) to FC at pF 2.0, a standard method used for laboratory pressure apparatus for evaluation of available water capacity (AWC) of different textural sugarcane growing soils in grouping to coarse, medium, fine texture and gravelly, 3 locations of each textural type were collected at the depths of 0-Ap, Ap-60, and 60-100 centimeters. Particle size distribution (PSD), bulk density (BD), and SWC at pF levels 0,1.0, 1.5, 2.0, 2.5, 3.0, and 4.2 were analyzed, then the FC was estimated at Cw(h)) from SWRC obtained from observed data with van Genuchten’s model in the RETC program. The results found that the predicted FC at Cw(h)) value was below pF 2.0, which was in the pF of 0.85-1.78. Experiment II Calibration and validation of SWC predicted by SER of sugarcane growing soils. The results show that the SER value decreases with increasing SWC. The shapes of SWRC in the resistivity box and soil core of the investigated soils are very similar. The comparisons analysis was previously used by BlandAltman in many method comparisons in the literature. The SWC derived from the soil core and pressure apparatus agrees with the SWC derived from SER. Based on SWRC in the resistivity box, the modification of the fitting equation model is proposed to develop a direct relationship between SER and matric suction for different soil textures. Moreover, the comparison of fitting parameters of the SER-matric suction characteristic curve with SWRC parameters is also linearly proportional to each other. The reason for the predicted SWC from each soil texture with the SER equation model is unsatisfactory. Experiment III Dynamics of soil water affecting water stress of sugarcane grown on different soil types. This study aims to identify the relationship between the SWC, SER, and Fv/Fm with daily change for different soil types. The sugarcane seedlings of Khon Kaen 3 cultivars at 3-month-olds were used as a testing plant. The experiment was conducted by the RCBD with 5 soil types as the treatments with 5 replications, including Tr.1_SR6_SL, Tr.2_SR1_CL, Tr.3_SR2_C, Tr.4_SR7_RC and Tr.5_SR8_G(CL). The water stress of sugarcane was indicated by the Fv/Fm value, which indicates that the water stress of all soils was below 0.78. The RC texture soil (Tr.4) and SL (Tr.1) exhibited soil water loss more easily than other soil groups. Our results imply that the SER value at the sugarcane stress can be used to establish the critical soil water content for sugarcane-growing soil. The result of the critical point of SER and SWC values to cause water stress of sugarcane seedling (Fv/Fm = 0.78) for Initial stage; Tr.1 at ~600 Ω.m, 7 %by wt., Tr.2 at ~25 Ω.m, 8 %by wt., Tr.3 at ~45 Ω.m, 8 %by wt., Tr. 4 at ~140 Ω.m,6 %by wt., and Tr. 5 at ~36 Ω.m, 7 %by wt., respectively. Tillering stage; Tr.1 at ~320 Ω.m, 7 %by wt., Tr.2 at ~160 Ω.m, 8 %by wt., Tr.3 at ~50 Ω.m, 10 %by wt., Tr. 4 at ~180 Ω.m, 11 %by wt., and Tr. 5 at ~60 Ω.m and 10 %by wt., respectively.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Natthapol Chittamart

Role: Thesis Advisor

Name: Surachet Aramrak

Role: Thesis Co-Advisor

Created: 2023

Modified: 2025-06-26

Issued: 2025-06-26

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/bhannapitch-sam-all.pdf

CallNumber: S667.S9.B43

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Soil Science

Grantor: Kasetsart University

©copyrights Kasetsart University

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