Evaluation of Available Soil Water Capacity in Different Textured Sugarcane Growing Soils Using RETC Program
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Abstract
The assessment of available soil water capacity (θAWC) of tropical soils is often inconsistent with the appropriate determination of the field capacity (θFC) in different soil textures, which affects identifying critical water content and irrigation. This study aimed to compare the assessment method of θFC by hydraulic parameters from soil water retention curve (SWRC) to θFC at pF 2.0, a standard method used for laboratory pressure apparatus for evaluation of θAWC of different textural sugarcane growing soils in grouping to coarse, medium, fine, and gravelly textures, 3 locations of each textural type were collected at the depths of 0-Ap, Ap-60, and 60 - 100 centimeters. Particle size distribution, bulk density (ρb), and soil water content (θv) at pF levels 0, 1.0, 1.5, 2.0, 2.5, 3.0, and 4.2 were analyzed, then the θFC was estimated at maximum hydraulic capacity (Cw(h)) from SWRC obtained from experiment data with van Genuchten’s model in RETC program. The results found that the predicted (θFC at Cw(h)) value was below pF 2.0, which was in the pF of 0.85 - 1.78. Therefore, this suggested that the assessments to θFC at Cw(h) depend on textural types and can be applied in the laboratory to determine more accurate critical soil water content, intervals, and amount of irrigation for sugarcane.
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