THE DROUGHT STRESS EFFECTS IN DIFFERENT CORN HYBRIDS PHOTOSYNTHETIC ACTIVITY AND PHENOLOGICAL PHARAMETERS. PUBLISHEDÁ. KOMLÓSI, G. BENCZE, Z. FUTÓ None firstname.lastname@example.org
We feel the drought negative effects more time in the last twenty years, because the climatic factors are changed. The farmers must do anything versus the drought, that they can slack this negative effects. The best medicine for the drought the irrigation, however, in years appear a promising line in the hybrid produce. The drought tolerate hybrids produce is a new line, wich like can affect the crop quantity in a droughts year. We look five different hybrids reactions for the drought stress in this research. We made three different water supply and three replay in the study. We set the research in the Szent István University Irrigation and Watermanagement Institute in Szarvas. In the research we look three water supply level (soil water storage capacity (SWS), which were SWS40%, SWS60%, SWS80%) to five different maize hybrids in culture vessel. In the research we look the salt stress reactions in salted soil too. We received the best SPAD value with the SWS 80% water supply level. The relative clorofill contens value was decrease in the end of the vegetation period, but the decrease was the smallest in good water supply. The biomass weight of maize hybrids improvement in all cases with improved water supply. The biomass weight of drought-tolerant hybrids decreased the least under drought stress, whenever the decrease in biomass weight of sensitive hybrids were much more significant. The root weight of corn hybrids decreased significantly under drought stress. The decrease reduced from 280 g to 190 g / plant. The smallest decrease was achieved by the roots of drought-tolerant hybrids. Leaf area index (LAI) of maize hybrids was also examined. The best LAI values were achieved by maize hybrids at the SWS 80% (good water supply) level. LAI values decreased by 19.5–21.7% due to drought stress. As a result of the drought stress, the LAI and root weight values of the hybrids decreased, resulting in low cob weights. A significant mean positive correlation was found between the maize cob weight of the hybrids and the LAI values at r=0.493. In the salted soil the hybrids show bigger drought stress while worsened the yield results. Under saline conditions, the water supply and individual production of maize deteriorated significantly, but significant differences were found between the hybrids. Overall, drought stress significantly reduces the production of corn hybrids. The smallest decrease was shown by drought-tolerant hybrids, that’s why so important the proper hybrid selection.
maize, SPAD, LAI, drought-stress, irrigation
field crops and pastures