Research Articles
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Study on estimation of infiltration rate with different soil conditioners and evaluation of infiltration models
Department of Soil and Water Conservation Engineering, Agricultural Engineering College and Research Institute, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, India
Department of Agricultural Engineering, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai 625 104, Tamil Nadu, India
Abstract
Soil conditioners enhance soil properties, particularly for moisture conservation in rain-fed agriculture. This study evaluated the effects of various soil conditioners, including hydrogel (0.001 t ha-1 and 0.002 t ha-1), gypsum, coir pith and press mud on the infiltration capacity of sandy clay loam soils at the Agricultural Engineering College and Research Institute in Kumulur, Tamil Nadu, a semi-arid region. Infiltration was measured using a double-ring infiltrometer and four models, Kostiakov, Horton, Green-Ampt and Philips, were used to predict the infiltration rates. Initial infiltration values measured were 19.2, 18, 16.8, 12, 10.8 and 9.6 cm h-¹ for treatments with hydrogel (0.002 t ha-1), hydrogel (0.001 t ha-1), gypsum, coir pith, press mud and the control(without conditioner), respectively. Results showed that hydrogel significantly improved infiltration, with the highest rate observed at 0.002 t ha-1 (19.2 cm h-1), compared to the control (8.2 cm/h-1). The Nash–Sutcliffe efficiency of the Philips model varied from 0.75 to 0.95 for the different soil conditioners and provided the most accurate prediction of infiltration rates, followed by the Horton model. This study highlights the importance of soil conditioners in improving water retention and infiltration, which are essential for effective water management in agricultural systems, particularly in semi-arid regions.
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