Using on infrared thermometer for establishment of water stress in green beans irrigated by diferent pre-irrigation soil moisture
Keywords:
green beans; infrared thermometer; irrigation; water stressAbstract
The aim of the work is to explore the possibility for using the infrared thermometer as an indicator of water stress in the green beans and establishment of a link between soil moisture and temperature difference (dt) between the surface of the leaves and that of the environment. The experiment was conducted in the period 2010 – 2012, at experimental field of Agricultural University – Plovdiv, on Alluvial Meadow Soil (Arenic Fluvisols, WRBSR, 2006). Used data from options in which the bean is irrigated at different pre-irrigation soil moisture, namely 60, 70, 80 and 90% of FC (field capacity) and option without irrigation. Under irrigated conditions and lack of rainfall, dt values reach up to +5 °C, and in conditions of optimum irrigation (pre-irrigation soil moisture 80% of FC) values decreased and were negative. The conditions of the experiment were reach about –4.5 °С. The irrigation by lower than 80% of FC soil moisture influence on the dT° values. Established a linear relationship between the values of dТ° and soil moisture as follows: for the layer 0 – 40 cm: Y = 79.49 – 4.32x at R2 = 0.847; for the layer 0 – 60 cm: Y = 80.52 – 3.67x at R2 = 0.801.
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