Abstract
An accurate prediction of variations in water consumption from a field and in the crop growih affected by the climate change due to global warming is important for the continuous agricultural activities. Components of water consumption in a farrnland, i.e. transpiration from the crop surface and evaporation from the soil surface, are influenced by the structure of crop canopy. In this study, the combined effects of elevated temperature and carbon dioxide (C02) concentration on the geometry and longevity of leaves of maize were examined through an experiment with growih chambers. Three treatments, i.e. TLCL (air temperature day/night: 28/22'C, C02 concentration: 350ppm), TLCH (28/22'C, 750ppm), and THCH (32/26'C, 750 ppm), were performed in different closed chamber respectively, and sixteen of maize (Zea mays L. cv. Pioneer G-98) planted in a pot were grown in each treatment. The cumulative thermal time from emergence of plant until the expansion of the ith leaf became larger in the order, TLCH<TLCL< THCH. The longevity of the ith leaf became longer in the order, TLCL<TLCH<THCH. Area of the ith leaf
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