Validation of an automated compensation evapotranspirometer with cadmium polluted maize
Keywords:
compensation evapotranspirometer, water lossAbstract
There are only a few facilities to determine the evapotranspiration of a crop canopy. One of these possibilities is the use of evapotranspirometers. In spite of known shortcomings of the equipment they are widely applied in the everyday practice of crop water loss measurements. In our investigation the traditional compensation evapotranspirometer of Thornthwaite-Matter type was renovated at Keszthely Agrometeorological Research Station in 2011. The volume of the tanks (growing chambers) was 4 m3 each with surface area of 4 m2, and the depth of them 1 m. The tanks were layered with soil column characteristic of the surroundings of Keszthely area. The test plant was a short growing season maize hybrid Perlona. Earlier traditional evapotranspirometers were able to measure the daily sum of lost water. Later on the mechanic construction of the equipment might be automated. The renewed instrument is able to collect the water use of the tank in second’s interval. We represent our preliminary results showing diurnal variation of maize evapotranspiration in two different treatments. One of them contains the impact of cadmium on maize water loss. Detailed discussion on the influence of cadmium pollution on water loss of maize excluded from the study. Performing of polluted crops aimed only an independent treatment in our methodological experiment. Main goal of this investigation was an outline of functioning of converted evapotranspirometers.
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