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Profile Water Balance Model under Irrigated and Rainfed Systems

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Title Profile Water Balance Model under Irrigated and Rainfed Systems
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Creator Uttam Kumar Mandal
K.S. Sundara Sarma
U.S. Victor
N.H. Rao
 
Subject water balance, wheat, gram
 
Description Not Available
A profile moisture model has been developed to evaluate the seasonal soil moisture fluctuation with respect to soil characteristics and land use pattern under irrigated and rainfed conditions in an area of agricultural fields. Daily rainfall and irrigation were used as model inputs. Instantaneous uniform redistribution of soil moisture in the effective root zone and negligible contribution of soil water through upward flux were assumed. An empirical model was used to determine the root depth. Runoff was estimated from rainfall data using the curve number technique of the Soil Conservation Service adapted for conditions in India and combined with a soil moisture–accounting procedure. The modified Penman method was used to calculate the reference evapotranspiration. To calculate the crop coefficient (Kc), regression equations were developed taking Kc as the dependent variable on normalized difference vegetation index. This model was very easy to parameterize and required a minimum soil data set of field capacity and permanent wilting point. To evaluate model performance, observed values of soil water were taken for wheat (Triticum aestivum L.) in the Mehrauli (sandy loam to loam texture) and Daryapur (loamy texture) soil series under irrigated conditions and for gram (Cicer arietinum L.) in the Jagat (clay loam texture) and Holambi (loam texture) soil series under rainfed conditions in Delhi. The r2 and D index between observed and predicted soil water values varied between 0.67 and 0.77 and 0.83 and 0.93, respectively.
Indian Agricultural Research Institute
 
Date 2021-07-26T11:15:32Z
2021-07-26T11:15:32Z
2002-01-01
 
Type Journal
 
Identifier Mandal, U.K., Sarma, K.S.S., Victor, U.S., and Rao, N.H. 2002. Profile water balance model under irrigated and rainfed systems. Agronomy Journal, 94(5): 1204-1211.
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http://krishi.icar.gov.in/jspui/handle/123456789/50209
 
Language English
 
Relation Not Available;
 
Publisher American Society of Agrnomy