Abstract
Abstract Interactive effects of air and soil temperature on flowering of 4- and 12-year-old ‘Frost Valencia’ orange [Citrus sinensis (L.) Osbeck] budded on trifoliate orange rootstocks [Poncirus trifoliata (L.) Raf.] were determined in controlled environments. Quiescent trees were subjected to 1 of 4 environmental treatments consisting of 2 day-night air temperature regimes in 2 glasshouses and 2 constant soil temperatures in each house. Total bud break was increased by warm soils (25°C) compared with cool soils (15°). In contrast, the initiation of flowers on the new shoots was mainly influenced by air temperature, with more flowers in cooler air (20/15°, day/night) than at temperatures of 30/15°. Lower air temperature, however, resulted in more leafless floral shoots while the greatest number of leafy floral shoots was produced with both warmer soil and higher air temperature.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have