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Evaporation from the soil surface is essentially the evaporation of water surrounding the soil particles as thin films and filling the pore spaces between them. Transpiration involves continuous movement of water from the roots, through the stem and lost through the leaves to the atmosphere. Land drainage reduces excessive wetness, encouraging gaseous exchange between the atmosphere and the soil thereby modifying the physical properties of soil conducive to root growth. Evapotranspiration includes both transpiration from plants and evaporation from the soil surface. It is controlled by (a) climatic conditions, (b) plant cover in relation to soil surface, (c) efficiency of water use by different plants and management practices and (d) length and season of the plant growing period(1). Evapotranspiration value may vary according to differences in climatic conditions (2). Soil water availability is a factor of increasing concern for most crop production under both rainfed and irrigated systems. Efficient field tools and sophisticated instrumentation techniques are needed to monitor soil moisture and crop demand for water under different irrigation systems. Adaptive management practices are needed to promote optimal soil physical, chemical and biological properties, stimulate deep rooting within the soil profile, and lessen the impact of reduced water availability(3). Water use efficiency (WUE) has several important implications related to agricultural sustainability, soil and water conservation(4). Water is becoming a scarce input particularly in sand dominated areas owing to climate change, increased water demand for irrigation and excessive growth of population. Besides water unavailability throughout the crop growing period is a threat for agricultural productivity. The quantity of gravitational water in a soil is related to several conditions, including the amount of precipitation, evaporation rates, how easily the water can move through the soil and the space available for water storage. Irrigation accuracy depends mainly on correct estimates of crop evapotranspiration, available soil water and soil types. In Lalmonirhat, dried up Teesta river in winter affects farming, fishing and communication. In Bogra, at Sariakandi and Dhunat upazilas farmers grow tomatoes in

Assessment of evapotranspiration loss of water from rice and wheat plants grown in sand and sandy soil in earthen pots under flood irrigation