Record Details

MODELLING OF EVAPORATION FROM BARE SOIL

KrishiKosh

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Title MODELLING OF EVAPORATION FROM BARE SOIL
 
Creator INGLE VISHAL KESHAORAO
 
Contributor A. K. Mishra
 
Subject irrigation, land resources, research methods, layering, soil water content, textural soil types, clay, soil water, field experimentation, fruits
 
Description T-8123
Field and laboratory simulation experiments were conducted to measure the bare
soil evaporation from silty clay loam soil of Jagat series (SCL) and sandy loam soil of
Mehrauli series (SL) of IARI farm, New Delhi during the months of March – April
2009. Soil moisture contents in different layers (0-15, 15-30, 30-45 and 45-60 cm
depths) below ground level (b.g.l.) were measured using gypsum blocks, tensiometers
and gravimetric methods at a 4 hours interval daily after field saturation. Bare soil
evaporation was estimated following a water balance approach from the measured soil
moisture content. Laboratory simulation studies were conducted to characterise the
behavior of different types of soil and estimates of bare soil evaporation were made
during the same period as field experiments.
Results obtained from the present study indicated that the bare soil evaporation
from 0-15 cm soil layer (top layer) in SCL soil varied between 2.0 to 3.0 mm per day in
the first phase which rose to 3.9 mm per day in the drying stage. For SL soil the bare
soil evaporation varied from a minimum of 2.0 to a maximum of 3.8 mm per day in
uppermost layer. In both soils the changes in soil moisture in other two layers were
large though, the same can not be referred to as evaporation.
In the laboratory simulation with two soils replicated thrice in soil columns;
almost identical behavior was observed as in the field experiments. The bare soil
evaporation from the laboratory simulation was found to be low as compared to field
conditions due to the controlled environmental condition.
Linear Multiple Regression (LMR) models were developed for predicting bare
soil evaporation using the predominant meteorological parameters affecting the
evaporation phenomenon. The developed models (MLRE) were validated with the field
observations for 0-15 and 15-30 cm soil depth with observed values and the result
shows very close agreement with predicted. The study concluded that the bare soil
evaporation can be predicted by the equations and results can be successfully used in
NCR region for the assessment of bare soil evaporation from similar soil types.
 
Date 2016-12-19T09:32:38Z
2016-12-19T09:32:38Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/90847
 
Format application/pdf
 
Publisher DIVISION OF AGRICULTURAL ENGINEERING