Simulation of groundwater recharge from direct seeded and transplanted rice fields
Loading...
Date
2021
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
A field study was conducted for assessment of potential groundwater recharge in direct seeded
and transplanted rice fields at Research farm of Department of Agronomy, Punjab Agricultural
University, Ludhiana using soil water balance method and simulation with HYDRUS-1D. The
soil of the research farm belongs to alluvial sandy loam in texture and climate of region is
semi-arid with average annual rainfall of 598.9 mm. Two treatments viz direct seeded (DSR)
and transplanted rice (TPR) with three replications each were sown/transplanted during kharif
season of year 2019. The irrigation amount of 1200 and 1100 mm was applied in TPR and
DSR, respectively during crop period. The deep percolation from the rice fields was
determined and predicted in order to assess potential groundwater recharge from both
treatments. The daily crop evapotranspiration was estimated by Penman-Monteith method
using climate data collected from meteorological observatory located near the field and daily
soil moisture content was recorded using Delta PR2 probe for model calibration and
validation. In soil water balance method, deep percolation which represent the potential
groundwater recharge was estimated by mass balance of total water input and output in TPR
and DSR fields and found to be 1139 and 1305.6 mm for TPR and DSR respectively. The
daily potential groundwater recharge in TPR and DSR fields was also predicted using
unsaturated flow model HYDRUS-1D represented as bottom flux and it was found to be 1131
and 1336 mm, respectively. The performance of the HYDRUS-1D model was evaluated using
statistical parameters viz. RMSE, NSE and R2 and found to be performing well. The
percentage change between estimated and model predicted potential groundwater recharge
was found to be 0.7% and 2.32% respectively, for TPR and DSR. From the study, it was
concluded that 9% more irrigation water was applied in TPR fields and there was 14.6% more
deep percolation in DSR as compared to TPR that may potentially contribute to groundwater
recharge.
Description
Keywords
Citation
Gulati, Dinesh (2021). Simulation of groundwater recharge from direct seeded and transplanted rice fields (Unpublished M.Tech. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.