Analysis of Rainfall Data to Estimate Rain Contribution Towards Crop Water Requirement Using Cropwat Model

Abstract

A study was carried out to define the analysis of rainfall data in order to estimate its contribution towards crop water requirements to overcome these problems. Rainfall and climatic data was collected from metrological stations, C.P UAF rain gauge (A), (AARI), (B), (CAA), (C) and (WAPDA), (D), Faisalabad of given region and this data was reserved for cross validation. The test station's (A) rainfall data was subjected to double mass curve technique to check its consistency with respect to other rainfall stations (B, C and D) in that area. The results derived by double curve technique were accurate for interested gauge station because there was no any break in curve. Then this consistent data was used to determine effective rainfall. The ET o was established by using penman-monteith method in the course of CROPWAT model and its effect with respect to other parameters like sun shine hour, wind speed, maximum & minimum temperature and rainfall humidity were determined. It was founded that the reference evapotranspiration (ET o ) is more during April to September due to increase in temperature and low in remaining months. After that data was placed in the model to acquire crop water requirement and irrigation of illustrative crops (wheat & maize) from the district. Through which we estimated that 7.5% rainfall for wheat and 15.5% rainfall for maize can contribute in actual irrigation per year. Through which we determined that 92.5 % and 84.5 % irrigation is required for wheat and maize crop respectively.

Contribution of Rainwater to the Irrigation Requirement for Paddy Cultivation at Tanore Upazila in Rajshahi, Bangladesh

“…Effective rainfall contributed 33% to 46% of water to the consumptive use requirement of rice between 2005 and 2012. The average contribution of effective rainfall was about 38%, whereas in Faisalabad, Pakistan, rainfall accounted 20 On the other hand, for other parts of Pakistan, rainfall contribution was found to be between the range of 13.03% and 100%, depending on the season and location. 25 In Senegal, it was found that rainfall contributes less than 30% of the evapotranspiration requirement of rice.…”

“…In Faisalabad, Pakistan, study showed that the rainwater contribution for wheat and maize was around 7.5% and 15.5% per year. 20 The study used CROPWAT computer model to determine consumptive use requirement in that region. Wisser et al 21 performed a global scale study on quantifying the significance of water captured by small reservoirs for crop production.…”

Effects of drip and alternate furrow method of irrigation on cotton yield and physical water productivity: A case study from farmers’ field of Bhavnagar district of Gujarat, India

“…The crop evapotranspiration (ETc), effective rainfall and irrigation water requirement were estimated using CropWat model developed by the Food and Agriculture Organisation (Allen et al, 1998;Bouraima et al, 2015;Amarasinghe et al, 2010;Laghari et al, 2014;Kumari et al, 2017a ). In the model, the whole cotton crop period was divided into four stages of crop periods i.e.…”

Optimising Cropping Pattern in Eastern Uttar Pradesh Using Sen's Multi Objective Programming Approach

“…The crop water requirement (in m 3 /ha) is calculated from the accumulated crop evapo-transpiration (ET c ) measured in mm/day over the complete crop growing period. Many past researchers have used CropWat model to estimate the crop water requirement (Bouraima et al, 2015;Amarasinghe et al, 2010;Laghari et al, 2014;Allen et al, 1998). The evapo-transpiration (ET c ) was calculated by using formula 1:…”