GRD Journals | Global Research and Development Journal for Engineering | Emerging Research and Innovations in Civil Engineering (ERICE - 2019) | February 2019
e-ISSN: 2455-5703
A Comparative Study of Irrigation Scheduling for Tomato by CropWat 9.0, Water Balance Method and Water Balance Method using Root Zone Depth by CropWat 9.0 - Case Study for Aat Distributary Navsari of Navsari Branch Canal KLBMC, Gujarat, India 1Mansi
Jayeshchandra Pathak 2Dilip Shete Department of Civil Engineering 1 Parul Institute of Technology, Vadodara, Gujarat 2Parul Institute of Engineering and Technology, Vadodara, Gujarat, India 1
Abstract A study was carried out to determine the irrigation water requirement of tomato in Aat Distributary Navsari of Navsari branch canal KLBMC, by using cropwat 9.0, water balance method and water balance method using root zone depth by cropwat 9.0. In this study twelve years of meteorological data from 2005 to 2017 were used. The effective rainfall obtained by cropwat 9.0, water balance method and water balance method using root zone depth by cropwat 9.0 is 1093.8 mm, 301.370 mm and 314.310 mm respectively. Actual seasonal evapotranspiration rate obtained by cropwat 9.0, water balance method and water balance method using root zone depth by cropwat 9.0 is 634.8 mm, 581.250 mm and 581.250 mm respectively. The net irrigation requirement is 456.4 mm using cropwat 9.0, 257.895 mm using water balance method and 266.035 mm using water balance method using root zone depth by cropwat 9.0. Irrigation scheduling by using water balance method can save water use up to 198.505 mm and 8.14 mm over cropwat 9.0 and water balance method using root zone depth by cropwat 9.0 respectively. The water balance method is more effective and efficient than the cropwat 9.0 and water balance method using root zone depth by cropwat 9.0, only because whereas the earlier method used available soil water at time t over the effective root zone depth and remaining available soil water for irrigation scheduling and cropwat 9.0 used daily soil water available and readily available water for the same purpose. Keyword- CROPWAT 9.0, Water Balance Method, Irrigation Scheduling, Net Irrigation Requirement, Tomato, AAT Distributary __________________________________________________________________________________________________
I. INTRODUCTION As per Water Policy of Government of Gujarat 2011, water resources planning for development and management of water resources projects in the state would be implemented, as far as possible, for multi-purpose uses. The provision for drinking water would be the primary consideration. As most of the major and medium schemes except Sardar Sarovar Project are completed long ago, to provide water for drinking purpose through the existing canal systems require scientific estimation of crop water requirement and drinking water requirement. The objectives of the study are to determine actual crop evapotranspiration rate (Eta), effective rainfall (Re) and net irrigation requirements (NIR). The net irrigation requirements for tomato crop in the irrigated areas of Aat Distributary of Navsari are presented in this paper.
II. STUDY AREA The State of Gujarat lies between 21°70’and 20°45’N Latitudes and 73°24’and 73°07’ Longitude (see Map 1) The study area is Aat Distributary Navsari of Navsari Branch Canal KLBMC Navsari in Navsari District (see Map 2, 3). It is located at 20.57°N 72.54°E. It has an average elevation of 10m above sea level. Weather in Navsari is sunny from September to May, rainy from June to August. The average maximum and minimum temperatures are 32.2°C and 21.4°C respectively.
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