V. Barek, P. Halaj, J. Zembery, A. Barekova, D. Halajova
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Water Resources. Forest, Marine And Ocean Ecosystems, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-02-5 / ISSN 1314-2704, June 16-22, 2013, 221 - 228 pp


Operational control of microirrigation, or more precisely the watering of the plants, represents setting of the size of a single irrigation dose and timing of application by one of the science-based methods, to cover the consumptive water deficit as soon as it is possible. Proper irrigation system ensures that plants achieve high production yields, applying relatively small amount of irrigation water at the right time. The main objective of the thesis was to compare the methods of managing the irrigation of the plants by means of measuring soil moisture, water saturate deficit of the plants and leaf surface reflection based on the principle of remote sensing, and propose an optimal method how to effectively and efficiently use the irrigation water to ensure optimum humidity condition of the plants. Research was conducted on maize (Zea mays L.) grown in experimental containers. We had stopped the irrigation of the plants on the principle of daily evapotranspiration at regular intervals and moved them into a dry environment, where they were exposed to stressful conditions. We studied the characteristics listed in the drought stressed plants and identified which one will be the fastest and the most apparent, and give us the correct information about the change of the moisture condition of the plants, or more precisely about the need for irrigation, well in advance before reaching the permanent changes. By measurement of the soil moisture, we evaluated the need for irrigation according to the soil hydrolimits reduced availability point, which represents the lower limit of the easily accessible soil water for the plants and defines an interval of available water capacity. By measurement of water saturate deficit we studied the ability of plants to regenerate during the night and the initial signs of leaves wilting in the evening. With the leaf surface reflections we proceeded the anticipated changes in value due to the reflex changes in humidity. From the results it possible to come to conclusion that the response to the water stress was quickly and accurately reflected in the observation of the water saturate deficit of the plants. Changes in water saturate deficit of the plants currently responded to a real need for water and real humidity condition in which the plant was located.

Keywords: irrigation system of plants, soil moisture, leaf surface reflection, water saturate deficit