Water being the principal potential source of enlivening the plants on earth and without it, it is the end for the life of living beings on earth. Though about two third of the world is of water but there is a scarcity of water for drinking for living beings as well as for plant watering. Inefficient watering of plants making water table fall and in many zones world wide becoming drought prone resulting in famine, mal-nutrition and suicides. Farmers being largely unscientific and unskilled mostly in developing countries using water inappropriately thereby agricultural yield is below its optimum level as well as land becoming saline due to washing of excess pesticides, fertilizers and water logging and becoming unfit for further farming. Hence it is proposed in this paper a novel approach to determine the efficient water requirement of agricultural fields for farming in a most scientific and cost effective manner and to design a ultra low cost moisture sensor using computer and thereby to manage the water resources more appropriately in agricultural farms for the plants irrigation and its results are presented.

Key words: Agricultural water resources,GHGsemission, irrigation automation, low cost sensor, soil moisture sensor