MODELLING OF EVAPORATION FROM BARE SOIL
KrishiKosh
View Archive InfoField | Value | |
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
|
|