Article

Mansi Jayeshchandra Pathak, Parul Institute of Technology; Dilip Shete ,Parul Institute of Engineering and Technology

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.