Evaluation of evapotranspiration for agricultural crops

Today´s world is in safe of secure environment but really we are in need of healthy food and chemical-free environment which is free from pollution and harmful pesticides. This paper is to project the aspects of geographical information system(GIS) in agricultural field for effective yield and efficient use of water for crops and it helps as a guide to the non-technical person(farmer) who suffer in making good productivity due to missing of seasonal rainfall. In terms of effective yield the requirement based on climatic condition, soil type and rainfall. Additionally an important factor is in terms of managing water, hereby we concentrate on evapotranspiration and it is evaluated by penman-monteith method. This method is best of ET calculation. Linear Regression Analysis is evaluated between estimated ET and observed ET. The knowledge discovered from the large dataset and conglomeration of GIS helps in precise management of agricultural crops with good yield in organic farming.