Les componantes de la balance Hydrique des deux type des mais différents dans les deux péridoes de végétation succesives

Anda, A. and Decsi, K. (2001) Les componantes de la balance Hydrique des deux type des mais différents dans les deux péridoes de végétation succesives. Acta Botanica Hungarica, 43 (3-4). pp. 259-273. ISSN 0236-6495

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Abstract

Differences in water balance components of two maize hybrids were investigated at the Agrometeorological Research Station of Keszthely, during the 1997–98 growing seasons. The length of the vegetative period of the two maize varieties was the same, only their water necessities differed significantly. Daily sums of evapotranspiration were measured in lysimeter growing chambers. Alteration in water loss of the two maize varieties was also characterised by daily mean stomatal resistances. Modification in the process of water exchange between the plant and its environment was determined by calculating the complex parameter of Crop Water Stress Index (CWSI). Surprisingly, at non limited watering level the water consumption of the two hybrids was almost the same. The stomatal resistance of the drought tolerant hybrid increased together with its plant temperature and CWSI, comparing to the parameters of other maize variety, that was bred for irrigated conditions. Decreased transpiration might increase the plant temperature and CWSI of drought tolerant hybrid. This relation can be successfully applied in the process of selecting plants for different watering levels.

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